# S. Frixione - INFN Genova

## Contact Details

NameS. Frixione |
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AffiliationINFN Genova |
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CityGenoa |
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CountryItaly |
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## Pubs By Year |
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## External Links |
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## Pub CategoriesHigh Energy Physics - Phenomenology (50) High Energy Physics - Experiment (8) |

## Publications Authored By S. Frixione

We study the production of jets in hadronic collisions, by computing all contributions proportional to $\alpha_S^n\alpha^m$, with $n+m=2$ and $n+m=3$. These correspond to leading and next-to-leading order results, respectively, for single-inclusive and dijet observables in a perturbative expansion that includes both QCD and electroweak effects. We discuss issues relevant to the definition of hadronic jets in the context of electroweak corrections, and present sample phenomenological predictions for the 13-TeV LHC. Read More

**Authors:**D. de Florian

^{1}, C. Grojean

^{2}, F. Maltoni

^{3}, C. Mariotti

^{4}, A. Nikitenko

^{5}, M. Pieri

^{6}, P. Savard

^{7}, M. Schumacher

^{8}, R. Tanaka

^{9}, R. Aggleton

^{10}, M. Ahmad

^{11}, B. Allanach

^{12}, C. Anastasiou

^{13}, W. Astill

^{14}, S. Badger

^{15}, M. Badziak

^{16}, J. Baglio

^{17}, E. Bagnaschi

^{18}, A. Ballestrero

^{19}, A. Banfi

^{20}, D. Barducci

^{21}, M. Beckingham

^{22}, C. Becot

^{23}, G. Bélanger

^{24}, J. Bellm

^{25}, N. Belyaev

^{26}, F. U. Bernlochner

^{27}, C. Beskidt

^{28}, A. Biekötter

^{29}, F. Bishara

^{30}, W. Bizon

^{31}, N. E. Bomark

^{32}, M. Bonvini

^{33}, S. Borowka

^{34}, V. Bortolotto

^{35}, S. Boselli

^{36}, F. J. Botella

^{37}, R. Boughezal

^{38}, G. C. Branco

^{39}, J. Brehmer

^{40}, L. Brenner

^{41}, S. Bressler

^{42}, I. Brivio

^{43}, A. Broggio

^{44}, H. Brun

^{45}, G. Buchalla

^{46}, C. D. Burgard

^{47}, A. Calandri

^{48}, L. Caminada

^{49}, R. Caminal Armadans

^{50}, F. Campanario

^{51}, J. Campbell

^{52}, F. Caola

^{53}, C. M. Carloni Calame

^{54}, S. Carrazza

^{55}, A. Carvalho

^{56}, M. Casolino

^{57}, O. Cata

^{58}, A. Celis

^{59}, F. Cerutti

^{60}, N. Chanon

^{61}, M. Chen

^{62}, X. Chen

^{63}, B. Chokoufé Nejad

^{64}, N. Christensen

^{65}, M. Ciuchini

^{66}, R. Contino

^{67}, T. Corbett

^{68}, R. Costa

^{69}, D. Curtin

^{70}, M. Dall'Osso

^{71}, A. David

^{72}, S. Dawson

^{73}, J. de Blas

^{74}, W. de Boer

^{75}, P. de Castro Manzano

^{76}, C. Degrande

^{77}, R. L. Delgado

^{78}, F. Demartin

^{79}, A. Denner

^{80}, B. Di Micco

^{81}, R. Di Nardo

^{82}, S. Dittmaier

^{83}, A. Dobado

^{84}, T. Dorigo

^{85}, F. A. Dreyer

^{86}, M. Dührssen

^{87}, C. Duhr

^{88}, F. Dulat

^{89}, K. Ecker

^{90}, K. Ellis

^{91}, U. Ellwanger

^{92}, C. Englert

^{93}, D. Espriu

^{94}, A. Falkowski

^{95}, L. Fayard

^{96}, R. Feger

^{97}, G. Ferrera

^{98}, A. Ferroglia

^{99}, N. Fidanza

^{100}, T. Figy

^{101}, M. Flechl

^{102}, D. Fontes

^{103}, S. Forte

^{104}, P. Francavilla

^{105}, E. Franco

^{106}, R. Frederix

^{107}, A. Freitas

^{108}, F. F. Freitas

^{109}, F. Frensch

^{110}, S. Frixione

^{111}, B. Fuks

^{112}, E. Furlan

^{113}, S. Gadatsch

^{114}, J. Gao

^{115}, Y. Gao

^{116}, M. V. Garzelli

^{117}, T. Gehrmann

^{118}, R. Gerosa

^{119}, M. Ghezzi

^{120}, D. Ghosh

^{121}, S. Gieseke

^{122}, D. Gillberg

^{123}, G. F. Giudice

^{124}, E. W. N. Glover

^{125}, F. Goertz

^{126}, D. Gonçalves

^{127}, J. Gonzalez-Fraile

^{128}, M. Gorbahn

^{129}, S. Gori

^{130}, C. A. Gottardo

^{131}, M. Gouzevitch

^{132}, P. Govoni

^{133}, D. Gray

^{134}, M. Grazzini

^{135}, N. Greiner

^{136}, A. Greljo

^{137}, J. Grigo

^{138}, A. V. Gritsan

^{139}, R. Gröber

^{140}, S. Guindon

^{141}, H. E. Haber

^{142}, C. Han

^{143}, T. Han

^{144}, R. Harlander

^{145}, M. A. Harrendorf

^{146}, H. B. Hartanto

^{147}, C. Hays

^{148}, S. Heinemeyer

^{149}, G. Heinrich

^{150}, M. Herrero

^{151}, F. Herzog

^{152}, B. Hespel

^{153}, V. Hirschi

^{154}, S. Hoeche

^{155}, S. Honeywell

^{156}, S. J. Huber

^{157}, C. Hugonie

^{158}, J. Huston

^{159}, A. Ilnicka

^{160}, G. Isidori

^{161}, B. Jäger

^{162}, M. Jaquier

^{163}, S. P. Jones

^{164}, A. Juste

^{165}, S. Kallweit

^{166}, A. Kaluza

^{167}, A. Kardos

^{168}, A. Karlberg

^{169}, Z. Kassabov

^{170}, N. Kauer

^{171}, D. I. Kazakov

^{172}, M. Kerner

^{173}, W. Kilian

^{174}, F. Kling

^{175}, K. Köneke

^{176}, R. Kogler

^{177}, R. Konoplich

^{178}, S. Kortner

^{179}, S. Kraml

^{180}, C. Krause

^{181}, F. Krauss

^{182}, M. Krawczyk

^{183}, A. Kulesza

^{184}, S. Kuttimalai

^{185}, R. Lane

^{186}, A. Lazopoulos

^{187}, G. Lee

^{188}, P. Lenzi

^{189}, I. M. Lewis

^{190}, Y. Li

^{191}, S. Liebler

^{192}, J. Lindert

^{193}, X. Liu

^{194}, Z. Liu

^{195}, F. J. Llanes-Estrada

^{196}, H. E. Logan

^{197}, D. Lopez-Val

^{198}, I. Low

^{199}, G. Luisoni

^{200}, P. Maierhöfer

^{201}, E. Maina

^{202}, B. Mansoulié

^{203}, H. Mantler

^{204}, M. Mantoani

^{205}, A. C. Marini

^{206}, V. I. Martinez Outschoorn

^{207}, S. Marzani

^{208}, D. Marzocca

^{209}, A. Massironi

^{210}, K. Mawatari

^{211}, J. Mazzitelli

^{212}, A. McCarn

^{213}, B. Mellado

^{214}, K. Melnikov

^{215}, S. B. Menari

^{216}, L. Merlo

^{217}, C. Meyer

^{218}, P. Milenovic

^{219}, K. Mimasu

^{220}, S. Mishima

^{221}, B. Mistlberger

^{222}, S. -O. Moch

^{223}, A. Mohammadi

^{224}, P. F. Monni

^{225}, G. Montagna

^{226}, M. Moreno Llácer

^{227}, N. Moretti

^{228}, S. Moretti

^{229}, L. Motyka

^{230}, A. Mück

^{231}, M. Mühlleitner

^{232}, S. Munir

^{233}, P. Musella

^{234}, P. Nadolsky

^{235}, D. Napoletano

^{236}, M. Nebot

^{237}, C. Neu

^{238}, M. Neubert

^{239}, R. Nevzorov

^{240}, O. Nicrosini

^{241}, J. Nielsen

^{242}, K. Nikolopoulos

^{243}, J. M. No

^{244}, C. O'Brien

^{245}, T. Ohl

^{246}, C. Oleari

^{247}, T. Orimoto

^{248}, D. Pagani

^{249}, C. E. Pandini

^{250}, A. Papaefstathiou

^{251}, A. S. Papanastasiou

^{252}, G. Passarino

^{253}, B. D. Pecjak

^{254}, M. Pelliccioni

^{255}, G. Perez

^{256}, L. Perrozzi

^{257}, F. Petriello

^{258}, G. Petrucciani

^{259}, E. Pianori

^{260}, F. Piccinini

^{261}, M. Pierini

^{262}, A. Pilkington

^{263}, S. Plätzer

^{264}, T. Plehn

^{265}, R. Podskubka

^{266}, C. T. Potter

^{267}, S. Pozzorini

^{268}, K. Prokofiev

^{269}, A. Pukhov

^{270}, I. Puljak

^{271}, M. Queitsch-Maitland

^{272}, J. Quevillon

^{273}, D. Rathlev

^{274}, M. Rauch

^{275}, E. Re

^{276}, M. N. Rebelo

^{277}, D. Rebuzzi

^{278}, L. Reina

^{279}, C. Reuschle

^{280}, J. Reuter

^{281}, M. Riembau

^{282}, F. Riva

^{283}, A. Rizzi

^{284}, T. Robens

^{285}, R. Röntsch

^{286}, J. Rojo

^{287}, J. C. Romão

^{288}, N. Rompotis

^{289}, J. Roskes

^{290}, R. Roth

^{291}, G. P. Salam

^{292}, R. Salerno

^{293}, M. O. P. Sampaio

^{294}, R. Santos

^{295}, V. Sanz

^{296}, J. J. Sanz-Cillero

^{297}, H. Sargsyan

^{298}, U. Sarica

^{299}, P. Schichtel

^{300}, J. Schlenk

^{301}, T. Schmidt

^{302}, C. Schmitt

^{303}, M. Schönherr

^{304}, U. Schubert

^{305}, M. Schulze

^{306}, S. Sekula

^{307}, M. Sekulla

^{308}, E. Shabalina

^{309}, H. S. Shao

^{310}, J. Shelton

^{311}, C. H. Shepherd-Themistocleous

^{312}, S. Y. Shim

^{313}, F. Siegert

^{314}, A. Signer

^{315}, J. P. Silva

^{316}, L. Silvestrini

^{317}, M. Sjodahl

^{318}, P. Slavich

^{319}, M. Slawinska

^{320}, L. Soffi

^{321}, M. Spannowsky

^{322}, C. Speckner

^{323}, D. M. Sperka

^{324}, M. Spira

^{325}, O. Stål

^{326}, F. Staub

^{327}, T. Stebel

^{328}, T. Stefaniak

^{329}, M. Steinhauser

^{330}, I. W. Stewart

^{331}, M. J. Strassler

^{332}, J. Streicher

^{333}, D. M. Strom

^{334}, S. Su

^{335}, X. Sun

^{336}, F. J. Tackmann

^{337}, K. Tackmann

^{338}, A. M. Teixeira

^{339}, R. Teixeira de Lima

^{340}, V. Theeuwes

^{341}, R. Thorne

^{342}, D. Tommasini

^{343}, P. Torrielli

^{344}, M. Tosi

^{345}, F. Tramontano

^{346}, Z. Trócsányi

^{347}, M. Trott

^{348}, I. Tsinikos

^{349}, M. Ubiali

^{350}, P. Vanlaer

^{351}, W. Verkerke

^{352}, A. Vicini

^{353}, L. Viliani

^{354}, E. Vryonidou

^{355}, D. Wackeroth

^{356}, C. E. M. Wagner

^{357}, J. Wang

^{358}, S. Wayand

^{359}, G. Weiglein

^{360}, C. Weiss

^{361}, M. Wiesemann

^{362}, C. Williams

^{363}, J. Winter

^{364}, D. Winterbottom

^{365}, R. Wolf

^{366}, M. Xiao

^{367}, L. L. Yang

^{368}, R. Yohay

^{369}, S. P. Y. Yuen

^{370}, G. Zanderighi

^{371}, M. Zaro

^{372}, D. Zeppenfeld

^{373}, R. Ziegler

^{374}, T. Zirke

^{375}, J. Zupan

^{376}

**Affiliations:**

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^{10}The LHC Higgs Cross Section Working Group,

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^{326}The LHC Higgs Cross Section Working Group,

^{327}The LHC Higgs Cross Section Working Group,

^{328}The LHC Higgs Cross Section Working Group,

^{329}The LHC Higgs Cross Section Working Group,

^{330}The LHC Higgs Cross Section Working Group,

^{331}The LHC Higgs Cross Section Working Group,

^{332}The LHC Higgs Cross Section Working Group,

^{333}The LHC Higgs Cross Section Working Group,

^{334}The LHC Higgs Cross Section Working Group,

^{335}The LHC Higgs Cross Section Working Group,

^{336}The LHC Higgs Cross Section Working Group,

^{337}The LHC Higgs Cross Section Working Group,

^{338}The LHC Higgs Cross Section Working Group,

^{339}The LHC Higgs Cross Section Working Group,

^{340}The LHC Higgs Cross Section Working Group,

^{341}The LHC Higgs Cross Section Working Group,

^{342}The LHC Higgs Cross Section Working Group,

^{343}The LHC Higgs Cross Section Working Group,

^{344}The LHC Higgs Cross Section Working Group,

^{345}The LHC Higgs Cross Section Working Group,

^{346}The LHC Higgs Cross Section Working Group,

^{347}The LHC Higgs Cross Section Working Group,

^{348}The LHC Higgs Cross Section Working Group,

^{349}The LHC Higgs Cross Section Working Group,

^{350}The LHC Higgs Cross Section Working Group,

^{351}The LHC Higgs Cross Section Working Group,

^{352}The LHC Higgs Cross Section Working Group,

^{353}The LHC Higgs Cross Section Working Group,

^{354}The LHC Higgs Cross Section Working Group,

^{355}The LHC Higgs Cross Section Working Group,

^{356}The LHC Higgs Cross Section Working Group,

^{357}The LHC Higgs Cross Section Working Group,

^{358}The LHC Higgs Cross Section Working Group,

^{359}The LHC Higgs Cross Section Working Group,

^{360}The LHC Higgs Cross Section Working Group,

^{361}The LHC Higgs Cross Section Working Group,

^{362}The LHC Higgs Cross Section Working Group,

^{363}The LHC Higgs Cross Section Working Group,

^{364}The LHC Higgs Cross Section Working Group,

^{365}The LHC Higgs Cross Section Working Group,

^{366}The LHC Higgs Cross Section Working Group,

^{367}The LHC Higgs Cross Section Working Group,

^{368}The LHC Higgs Cross Section Working Group,

^{369}The LHC Higgs Cross Section Working Group,

^{370}The LHC Higgs Cross Section Working Group,

^{371}The LHC Higgs Cross Section Working Group,

^{372}The LHC Higgs Cross Section Working Group,

^{373}The LHC Higgs Cross Section Working Group,

^{374}The LHC Higgs Cross Section Working Group,

^{375}The LHC Higgs Cross Section Working Group,

^{376}The LHC Higgs Cross Section Working Group

This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. Read More

We study the production of a Standard Model Higgs boson in the gluon-fusion channel at the 13 TeV LHC. Our results are accurate to the next-to-leading order in QCD, bar for the lack of some two-loop amplitudes, for up to two extra jets and are matched to the PYTHIA8 Monte Carlo. We address the impact, at the level of inclusive rates and of differential distributions, of the merging of samples characterised by different final-state multiplicities, and of the effects induced by top and bottom masses through heavy-quark loop diagrams. Read More

We study the hadroproduction of a $Wb$ pair in association with a light jet, focusing on the dominant $t$-channel contribution and including exactly at the matrix-element level all non-resonant and off-shell effects induced by the finite top-quark width. Our simulations are accurate to the next-to-leading order in QCD, and are matched to the HERWIG6 and PYTHIA8 parton showers through the MC@NLO method. We present phenomenological results relevant to the 8 TeV LHC, and carry out a thorough comparison to the case of on-shell $t$-channel single-top production. Read More

We consider the production of a single $Z$ or $W$ boson in association with jets at the LHC. We compute the corresponding cross sections by matching NLO QCD predictions with the Herwig++ and Pythia8 parton showers, and by merging all of the underlying matrix elements with up to two light partons at the Born level. We compare our results with several 7-TeV measurements by the ATLAS and CMS collaborations, and overall we find a good agreement between theory and data. Read More

We compute the contribution of order $\alpha_S^2\alpha^2$ to the cross section of a top-antitop pair in association with at least one heavy Standard Model boson -- $Z$, $W^\pm$, and Higgs -- by including all effects of QCD, QED, and weak origin and by working in the automated MadGraph5_aMC@NLO framework. This next-to-leading order contribution is then combined with that of order $\alpha_S^3\alpha$, and with the two dominant lowest-order ones, $\alpha_S^2\alpha$ and $\alpha_S\alpha^2$, to obtain phenomenological results relevant to a 8, 13, and 100~TeV $pp$ collider. Read More

We study the production of a Higgs boson in association with bottom quarks in hadronic collisions, and present phenomenological predictions relevant to the 13 TeV LHC. Our results are accurate to the next-to-leading order in QCD, and matched to parton showers through the MC@NLO method; thus, they are fully differential and based on unweighted events, which we shower by using both Herwig++ and Pythia8. We perform the computation in both the four-flavour and the five-flavour schemes, whose results we compare extensively at the level of exclusive observables. Read More

We present a procedure for the determination of the mass of the top quark at the LHC based on leptonic observables in dilepton $t\bar{t}$ events. Our approach utilises the shapes of kinematic distributions through their few lowest Mellin moments; it is notable for its minimal sensitivity to the modelling of long-distance effects, for not requiring the reconstruction of top quarks, and for having a competitive precision, with theory errors on the extracted top mass of the order of 0.8 GeV. Read More

We present the calculation of the next-to-leading contribution of order $\alpha_S^2\alpha^2$ to the production of a Standard Model Higgs boson in association with a top-quark pair at hadron colliders. All effects of weak and QCD origin are included, whereas those of QED origin are ignored. We work in the MadGraph5_aMC@NLO framework, and discuss sample phenomenological applications at a 8, 13, and 100 TeV $pp$ collider, including the effects of the dominant next-to-leading QCD corrections of order $\alpha_S^3\alpha$. Read More

We present the interface between MadGraph5_aMC@NLO, a self-contained program that calculates cross sections up to next-to-leading order accuracy in an automated manner, and APPLgrid, a code that parametrises such cross sections in the form of look-up tables which can be used for the fast computations needed in the context of PDF fits. The main characteristic of this interface, which we dub aMCfast, is its being fully automated as well, which removes the need to extract manually the process-specific information for additional physics processes, as is the case with other matrix element calculators, and renders it straightforward to include any new process in the PDF fits. We demonstrate this by studying several cases which are easily measured at the LHC, have a good constraining power on PDFs, and some of which were previously unavailable in the form of a fast interface. Read More

**Authors:**J. Alwall, R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, H. -S. Shao, T. Stelzer, P. Torrielli, M. Zaro

**Category:**High Energy Physics - Phenomenology

We discuss the theoretical bases that underpin the automation of the computations of tree-level and next-to-leading order cross sections, of their matching to parton shower simulations, and of the merging of matched samples that differ by light-parton multiplicities. We present a computer program, MadGraph5_aMC@NLO, capable of handling all these computations -- parton-level fixed order, shower-matched, merged -- in a unified framework whose defining features are flexibility, high level of parallelisation, and human intervention limited to input physics quantities. We demonstrate the potential of the program by presenting selected phenomenological applications relevant to the LHC and to a 1-TeV $e^+e^-$ collider. Read More

We present predictions for the SM-Higgs-pair production channels of relevance at the LHC: gluon-gluon fusion, VBF, and top-pair, W, Z and single-top associated production. All these results are at the NLO accuracy in QCD, and matched to parton showers by means of the MC@NLO method; hence, they are fully differential. With the exception of the gluon-gluon fusion process, for which a special treatment is needed in order to improve upon the infinite-top-mass limit, our predictions are obtained in a fully automatic way within the publicly available MadGraph5_aMC@NLO framework. Read More

**Authors:**S. Alioli, S. Badger, J. Bellm, B. Biedermann, F. Boudjema, G. Cullen, A. Denner, H. van Deurzen, S. Dittmaier, R. Frederix, S. Frixione, M. V. Garzelli, S. Gieseke, E. W. N. Glover, N. Greiner, G. Heinrich, V. Hirschi, S. Hoeche, J. Huston, H. Ita, N. Kauer, F. Krauss, G. Luisoni, D. Maitre, F. Maltoni, P. Nason, C. Oleari, R. Pittau, S. Plaetzer, S. Pozzorini, L. Reina, C. Reuschle, T. Robens, J. Schlenk, M. Schoenherr, F. Siegert, J. F. von Soden-Fraunhofen, F. Tackmann, F. Tramontano, P. Uwer, G. Salam, P. Skands, S. Weinzierl, J. Winter, V. Yundin, G. Zanderighi, M. Zaro

**Category:**High Energy Physics - Phenomenology

We present an update of the Binoth Les Houches Accord (BLHA) to standardise the interface between Monte Carlo programs and codes providing one-loop matrix elements. Read More

**Authors:**The LHC Higgs Cross Section Working Group, S. Heinemeyer

^{1}, C. Mariotti

^{2}, G. Passarino

^{3}, R. Tanaka

^{4}, J. R. Andersen, P. Artoisenet, E. A. Bagnaschi, A. Banfi, T. Becher, F. U. Bernlochner, S. Bolognesi, P. Bolzoni, R. Boughezal, D. Buarque, J. Campbell, F. Caola, M. Carena, F. Cascioli, N. Chanon, T. Cheng, S. Y. Choi, A. David, P. de Aquino, G. Degrassi, D. Del Re, A. Denner, H. van Deurzen, S. Diglio, B. Di Micco, R. Di Nardo, S. Dittmaier, M. Duhrssen, R. K. Ellis, G. Ferrera, N. Fidanza, M. Flechl, D. de Florian, S. Forte, R. Frederix, S. Frixione, S. Gangal, Y. Gao, M. V. Garzelli, D. Gillberg, P. Govoni, M. Grazzini, N. Greiner, J. Griffiths, A . V. Gritsan, C. Grojean, D. C. Hall, C. Hays, R. Harlander, R. Hernandez-Pinto, S. Hoche, J. Huston, T. Jubb, M. Kadastik, S. Kallweit, A. Kardos, L. Kashif, N. Kauer, H. Kim, R. Klees, M. Kramer, F. Krauss, A. Laureys, S. Laurila, S. Lehti, Q. Li, S. Liebler, X. Liu, H. E. Logan, G. Luisoni, M. Malberti, F. Maltoni, K. Mawatari, F. Maierhofer, H. Mantler, S. Martin, P. Mastrolia, O. Mattelaer, J. Mazzitelli, B. Mellado, K. Melnikov, P. Meridiani, D. J. Miller, E. Mirabella, S. O. Moch, P. Monni, N. Moretti, A. Muck, M. Muhlleitner, P. Musella, P. Nason, C. Neu, M. Neubert, C. Oleari, J. Olsen, G. Ossola, T. Peraro, K. Peters, F. Petriello, G. Piacquadio, C. T. Potter, S. Pozzorini, K. Prokofiev, I. Puljak, M. Rauch, D. Rebuzzi, L. Reina, R. Rietkerk, A. Rizzi, Y. Rotstein-Habarnau, G. P. Salam, G. Sborlini, F. Schissler, M. Schonherr, M. Schulze, M. Schumacher, F. Siegert, P. Slavich, J. M. Smillie, O. Stal, J. F. von Soden-Fraunhofen, M. Spira, I. W. Stewart, F. J. Tackmann, P. T. E. Taylor, D. Tommasini, J. Thompson, R. S. Thorne, P. Torrielli, F. Tramontano, N. V. Tran, Z. Trocsanyi, M. Ubiali, P. Vanlaer, M. Vazquez Acosta, T. Vickey, A. Vicini, W. J. Waalewijn, D. Wackeroth, C. Wagner, J. R. Walsh, J. Wang, G. Weiglein, A. Whitbeck, C. Williams, J. Yu, G. Zanderighi, M. Zanetti, M. Zaro, P. M. Zerwas, C. Zhang, T. J . E. Zirke, S. Zuberi

**Affiliations:**

^{1}eds.,

^{2}eds.,

^{3}eds.,

^{4}eds.

This Report summarizes the results of the activities in 2012 and the first half of 2013 of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. This report follows the first working group report Handbook of LHC Higgs Cross Sections: 1. Read More

We introduce a framework, based on an effective field theory approach, that allows one to perform characterisation studies of the boson recently discovered at the LHC, for all the relevant channels and in a consistent, systematic and accurate way. The production and decay of such a boson with various spin and parity assignments can be simulated by means of multi-parton, tree-level matrix elements and of next-to-leading order QCD calculations, both matched with parton showers. Several sample applications are presented which show, in particular, that beyond-leading-order effects in QCD have non-trivial phenomenological implications. Read More

This letter details and discusses the next-to-leading order QCD corrections to $t$-channel electro-weak $W^+ b j$ production, where finite top-width effects are consistently taken into account. The computation is done within the aMC@NLO framework and includes both resonant and non-resonant contributions as well as interferences between the two. Results are presented for the LHC and compared to those of the narrow-width approximation and effective theory approaches. Read More

We present a study of Higgs hadroproduction through vector-boson fusion at the NLO in QCD matched with parton showers. We discuss the matching systematics affecting this process through a comparison of the aMC@NLO predictions with the POWHEG and the pure-NLO ones. Read More

The next-to-leading order accuracy for MC@NLO results exclusive in J light jets is achieved if the computation is based on matrix elements that feature J and J+1 QCD partons. The simultaneous prediction of observables which are exclusive in different light-jet multiplicities cannot simply be obtained by summing the above results over the relevant range in J; rather, a suitable merging procedure must be defined. We address the problem of such a merging, and propose a solution that can be easily incorporated into existing MC@NLO implementations. Read More

We present predictions for a variety of single-inclusive observables that stem from the production of charm and bottom quark pairs at the 7 TeV LHC. They are obtained within the FONLL semi-analytical framework, and with two "Monte Carlo + NLO" approaches, MC@NLO and POWHEG. Results are given for final states and acceptance cuts that are as close as possible to those used by experimental collaborations and, where feasible, are compared to LHC data. Read More

**Authors:**J. Alcaraz Maestre, S. Alioli, J. R. Andersen, R. D. Ball, A. Buckley, M. Cacciari, F. Campanario, N. Chanon, G. Chachamis, V. Ciulli, F. Cossutti, G. Cullen, A. Denner, S. Dittmaier, J. Fleischer, R. Frederix, S. Frixione, J. Gao, L. Garren, S. Gascon-Shotkin, N. Greiner, J. P. Guillet, T. Hapola, N. P. Hartland, G. Heinrich, G. Hesketh, V. Hirschi, H. Hoeth, J. Huston, T. Ježo, S. Kallweit, K. Kovařík, F. Krauss, A. Kusina, Z. Liang, P. Lenzi, L. Lönnblad, J. J. Lopez-Villarejo, G. Luisoni, D. Maître, F. Maltoni, P. Mastrolia, P. M. Nadolsky, E. Nurse, C. Oleari, F. I. Olness, G. Ossola, E. Pilon, R. Pittau, S. Plätzer, S. Pozzorini, S. Prestel, E. Re, T. Reiter, T. Riemann, J. Rojo, G. P. Salam, S. Sapeta, I. Schienbein, M. Schönherr, H. Schulz, M. Schulze, M. Schwoerer, P. Skands, J. M. Smillie, G. Somogyi, G. Soyez, T. Stavreva, I. W. Stewart, M. Stockton, Z. Szor, F. J. Tackmann, P. Torrielli, F. Tramontano, M. Tripiana, Z. Trócsányi, M. Ubiali, V. Yundin, S. Weinzierl, J. Winter, J. Y. Yu, K. Zapp

The 2011 Les Houches workshop was the first to confront LHC data. In the two years since the previous workshop there have been significant advances in both soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the inclusion of those NLO calculations into parton shower Monte Carlos, and the tuning of the non-perturbative parameters of those Monte Carlos. These proceedings describe the theoretical advances that have taken place, the impact of the early LHC data, and the areas for future development. Read More

We use aMC@NLO to predict the lv+ 2-jet cross section at the NLO accuracy in QCD matched to parton shower simulations. We find that the perturbative expansion is well behaved for all the observables we study, and in particular for those relevant to the experimental analyses. We therefore conclude that NLO corrections to this process cannot be responsible for the excess of events in the dijet invariant mass observed by the CDF collaboration. Read More

We use aMC@NLO to study the production of four charged leptons at the LHC, performing parton showers with both HERWIG and Pythia6. Our underlying matrix element calculation features the full next-to-leading order $O(\alpha_S)$ result and the $O(\alpha_S^2)$ contribution of the $gg$ channel, and it includes all off-shell, spin-correlation, virtual-photon-exchange, and interference effects. We present several key distributions together with the corresponding theoretical uncertainties. Read More

We present a study of l\nu b\bar{b} and l+ l- b\bar{b} production at hadron colliders. Our results, accurate to the next-to-leading order in QCD, are based on automatic matrix-element calculations performed by MadLoop and MadFKS, and are given at both the parton level, and after the matching with the Herwig event generator, achieved with aMC@NLO. We retain the complete dependence on the bottom-quark mass, and include exactly all spin correlations of final-state leptons. Read More

We apply the MC@NLO formalism to the production of heavy-quark pairs in pointlike photon-hadron collisions. By combining this result with its analogue relevant to hadron-hadron collisions, we obtain NLO predictions matched to parton showers for the photoproduction of QQ^{-} pairs. We compare MC@NLO results to the measurements of c- and b-flavoured hadron observables performed by the H1 and ZEUS collaborations at HERA. Read More

I formulate in a colour-friendly way the FKS method for the computation of QCD cross sections at the next-to-leading order accuracy. This is achieved through the definition of subtraction terms for squared matrix elements, constructed with single colour-dressed or pairs of colour-ordered amplitudes. The latter approach relies on the use of colour flows, is exact to all orders in $N$, and is thus particularly suited to being organized as a systematic expansion in 1/N. Read More

We present the calculation of scalar and pseudoscalar Higgs production in association with a top-antitop pair to the next-to-leading order (NLO) accuracy in QCD, interfaced with parton showers according to the MC@NLO formalism. We apply our results to the cases of light and very light Higgs boson production at the LHC, giving results for total rates as well as for sample differential distributions, relevant to the Higgs, to the top quarks, and to their decay products. This work constitutes the first phenomenological application of aMC@NLO, a fully automated approach to complete event generation at NLO in QCD. Read More

We present the complete automation of the computation of one-loop QCD corrections, including UV renormalization, to an arbitrary scattering process in the Standard Model. This is achieved by embedding the OPP integrand reduction technique, as implemented in CutTools, into the MadGraph framework. By interfacing the tool so constructed, which we dub MadLoop, with MadFKS, the fully automatic computation of any infrared-safe observable at the next-to-leading order in QCD is attained. Read More

This is the user's manual of MC@NLO 4.0. This package is a practical implementation, based upon the Fortran HERWIG and Herwig++ event generators, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Read More

We present the calculations necessary to obtain next-to-leading order QCD precision with the Herwig++ event generator using the MC@NLO approach, and implement them for all the processes that were previously available from Fortran HERWIG with MC@NLO. We show a range of results comparing the two implementations. With these calculations and recent developments in the automatic generation of NLO matrix elements, it will be possible to obtain NLO precision with Herwig++ for a much wider range of processes Read More

The highest exclusive jet multiplicity studied at LEP experiments is five. In this paper we compute the next-to-leading order QCD corrections to e+e- annihilation to five jets, essentially closing the (pure) perturbative QCD studies of exclusive jetty final states at LEP. We compare fixed-order perturbative results with ALEPH data. Read More

**Authors:**T. Binoth, G. Dissertori, J. Huston, R. Pittau, J. R. Andersen, J. Archibald, S. Badger, R. D. Ball, G. Bevilacqua, I. Bierenbaum, T. Binoth, F. Boudjema, R. Boughezal, A. Bredenstein, R. Britto, M. Campanelli, J. Campbell, L. Carminati, G. Chachamis, V. Ciulli, G. Cullen, M. Czakon, L. Del Debbio, A. Denner, G. Dissertori, S. Dittmaier, S. Forte, R. Frederix, S. Frixione, E. Gardi, M. V. Garzelli, S. Gascon-Shotkin, T. Gehrmann, A. Gehrmann-De Ridder, W. Giele, T. Gleisberg, E. W. N. Glover, N. Greiner, A. Guffanti, J. -Ph. Guillet, A. van Hameren, G. Heinrich, S. Hoeche, M. Huber, J. Huston, M. Jaquier, S. Kallweit, S. Karg, N. Kauer, F. Krauss, J. I. Latorre, A. Lazopoulos, P. Lenzi, G. Luisoni, R. Mackeprang, L. Magnea, D. Maitre, D. Majumder, I. Malamos, F. Maltoni, K. Mazumdar, P. Nadolsky, P. Nason, C. Oleari, F. Olness, C. G. Papadopoulos, G. Passarino, E. Pilon, R. Pittau, S. Pozzorini, T. Reiter, J. Reuter, M. Rodgers, G. Rodrigo, J. Rojo, G. Sanguinetti, F. -P. Schilling, M. Schumacher, S. Schumann, R. Schwienhorst, P. Skands, H. Stenzel, F. Stoeckli, R. Thorne, M. Ubiali, P. Uwer, A. Vicini, M. Warsinsky, G. Watt, J. Weng, I. Wigmore, S. Weinzierl, J. Winter, M. Worek, G. Zanderighi

**Category:**High Energy Physics - Phenomenology

This report summarizes the activities of the SM and NLO Multileg Working Group of the Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009. Read More

We present the matching between a next-to-leading order computation in QCD and the PYTHIA parton shower Monte Carlo, according to the MC@NLO formalism. We study the case of initial-state radiation, and consider in particular single vector boson hadroproduction. Read More

We discuss the calculation of charged Higgs boson production in association with top quark in the MC@NLO framework for combining NLO matrix elements with a parton shower. The process is defined in a model independent manner for wide applicability, and can be used if the charged Higgs boson mass is either greater or less than the mass of the top quark. For the latter mass region, care is needed in defining the charged Higgs production mode due to interference with top pair production. Read More

We present the complete automation of the universal subtraction formalism proposed by Frixione, Kunszt, and Signer for the computation of any cross section at the next-to-leading order in QCD. Given a process, the only ingredient to be provided externally is the infrared- and ultraviolet-finite contribution of virtual origin. Our implementation, currently restricted to the case of e+e- collisions, is built upon and works in the same way as MadGraph. Read More

We address the issue of single top production in association with a W boson at the Large Hadron Collider, in particular how to obtain an accurate description in the face of the top pair production background given that the two processes interfere with each other. We stress the advantages of an MC@NLO description, and find that for cuts used to isolate the signal, it makes sense to consider Wt as a well-defined production process in that the interference with top pair production is small, and the cross-section of the former is above the scale variation uncertainty associated with the latter. We also consider the case where both Wt and top pair production are backgrounds to a third process (Higgs boson production followed by decay to a W boson pair), and find in this context that interference issues can also be neglected. Read More

**Authors:**F. Ambroglini, R. Armillis, P. Azzi, G. Bagliesi, A. Ballestrero, G. Balossini, A. Banfi, P. Bartalini, D. Benedetti, G. Bevilacqua, S. Bolognesi, A. Cafarella, C. M. Carloni Calame, L. Carminati, M. Cobal, G. Corcella, C. Coriano', A. Dainese, V. Del Duca, F. Fabbri, M. Fabbrichesi, L. Fano', Alon E. Faraggi, S. Frixione, L. Garbini, A. Giammanco, M. Guzzi, N. Irges, E. Maina, C. Mariotti, G. Masetti, B. Mele, E. Migliore, G. Montagna, M. Monteno, M. Moretti, P. Nason, O. Nicrosini, A. Nisati, A. Perrotta, F. Piccinini, G. Polesello, D. Rebuzzi, A. Rizzi, S. Rolli, C. Roda, S. Rosati, A. Santocchia, D. Stocco, F. Tartarelli, R. Tenchini, A. Tonero, M. Treccani, D. Treleani, A. Tricoli, D. Trocino, L. Vecchi, A. Vicini, I. Vivarelli

**Category:**High Energy Physics - Phenomenology

These proceedings collect the presentations given at the first three meetings of the INFN "Workshop on Monte Carlo's, Physics and Simulations at the LHC", held at the Frascati National Laboratories in 2006. The first part of these proceedings contains pedagogical introductions to several basic topics of both theoretical and experimental high pT LHC physics. The second part collects more specialised presentations. Read More

**Authors:**F. Ambroglini, R. Armillis, P. Azzi, G. Bagliesi, A. Ballestrero, G. Balossini, A. Banfi, P. Bartalini, D. Benedetti, G. Bevilacqua, S. Bolognesi, A. Cafarella, C. M. Carloni Calame, L. Carminati, M. Cobal, G. Corcella, C. Coriano', A. Dainese, V. Del Duca, F. Fabbri, M. Fabbrichesi, L. Fano', Alon E. Faraggi, S. Frixione, L. Garbini, A. Giammanco, M. Grazzini, M. Guzzi, N. Irges, E. Maina, C. Mariotti, G. Masetti, B. Mele, E. Migliore, G. Montagna, M. Monteno, M. Moretti, P. Nason, O. Nicrosini, A. Nisati, A. Perrotta, F. Piccinini, G. Polesello, D. Rebuzzi, A. Rizzi, S. Rolli, C. Roda, S. Rosati, A. Santocchia, D. Stocco, F. Tartarelli, R. Tenchini, A. Tonero, M. Treccani, D. Treleani, A. Tricoli, D. Trocino, L. Vecchi, A. Vicini, I. Vivarelli

**Category:**High Energy Physics - Phenomenology

These proceedings collect the presentations given at the first three meetings of the INFN "Workshop on Monte Carlo's, Physics and Simulations at the LHC", held at the Frascati National Laboratories in 2006. The first part of these proceedings contains pedagogical introductions to several basic topics of both theoretical and experimental high pT LHC physics. The second part collects more specialised presentations. Read More

This is the user's manual of MC@NLO 3.4. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Read More

We present the calculation of the Wt single-top production channel to next-to-leading order in QCD, interfaced with parton showers within the MC@NLO formalism. This channel provides a complementary way of investigating the properties of the Wtb vertex, with respect to the s- and t-channels. We pay special attention to the separation of this process from top quark pair production. Read More

We present updated predictions for the total production cross section of top-quark pairs at the Tevatron and at the LHC, and, at the LHC, of heavy-quark pairs with mass in the range 0.5-2 TeV. For t\bar{t} production at the LHC we also present results at \sqrt{S}= 10 TeV, in view of the expected accelerator conditions during the forthcoming 2008 run. Read More

The aim of this work is to describe in detail the POWHEG method, first suggested by one of the authors, for interfacing parton-shower generators with NLO QCD computations. We describe the method in its full generality, and then specify its features in two subtraction frameworks for NLO calculations: the Catani-Seymour and the Frixione-Kunszt-Signer approach. Two examples are discussed in detail in both approaches: the production of hadrons in e+e- collisions, and the Drell-Yan vector-boson production in hadronic collisions. Read More

We present a next-to-leading order calculation of heavy flavour production in hadronic collisions that can be interfaced to shower Monte Carlo programs. The calculation is performed in the context of the POWHEG method. It is suitable for the computation of charm, bottom and top hadroproduction. Read More

This note documents the use of the POWHEG-hvq package, a generator for heavy flavour hadroproduction at next-to-leading order in QCD, that can be easily interfaced to shower Monte Carlo programs, in such a way that NLO and shower accuracy are both maintained. Read More

We explain how angular correlations in leptonic decays of vector bosons and top quarks can be included in Monte Carlo parton showers, in particular those matched to NLO QCD computations. We consider the production of $n$ pairs of leptons, originating from the decays of $n$ electroweak vector bosons or of $n$ top quarks, in the narrow-width approximation. In the latter case, the information on the $n$ $b$ quarks emerging from the decays is also retained. Read More

This is the user's manual of MC@NLO 3.3. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Read More

**Authors:**J. Alwall, A. Ballestrero, P. Bartalini, S. Belov, E. Boos, A. Buckley, J. M. Butterworth, L. Dudko, S. Frixione, L. Garren, S. Gieseke, A. Gusev, I. Hinchliffe, J. Huston, B. Kersevan, F. Krauss, N. Lavesson, L. Lönnblad, E. Maina, F. Maltoni, M. L. Mangano, F. Moortgat, S. Mrenna, C. G. Papadopoulos, R. Pittau, P. Richardson, M. H. Seymour, A. Sherstnev, T. Sjöstrand, P. Skands, S. R. Slabospitsky, Z. Wcas, B. R. Webber, M. Worek, D. Zeppenfeld

**Category:**High Energy Physics - Phenomenology

A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing. Read More

**Authors:**C. Buttar, S. Dittmaier, V. Drollinger, S. Frixione, A. Nikitenko, S. Willenbrock S. Abdullin, E. Accomando, D. Acosta, A. Arbuzov, R. D. Ball, A. Ballestrero, P. Bartalini, U. Baur, A. Belhouari, S. Belov, A. Belyaev, D. Benedetti, T. Binoth, S. Bolognesi, S. Bondarenko, E. E. Boos, F. Boudjema, A. Bredenstein, V. E. Bunichev, C. Buttar, J. M. Campbell, C. Carloni Calame, S. Catani, R. Cavanaugh, M. Ciccolini, J. Collins, A. M. Cooper-Sarkar, G. Corcella, S. Cucciarelli, G. Davatz, V. DelDuca, A. Denner, J. D'Hondt, S. Dittmaier, V. Drollinger, A. Drozdetskiy, L. V. Dudko, M. Duehrssen, R. Frazier, S. Frixione, J. Fujimoto, S. Gascon-Shotkin, T. Gehrmann, A. Gehrmann-De Ridder, A. Giammanco, A. -S. Giolo-Nicollerat, E. W. N. Glover, R. M. Godbole, A. Grau, M. Grazzini, J. -Ph. Guillet, A. Gusev, R. Harlander, R. Hegde, G. Heinrich, J. Heyninck, J. Huston, T. Ishikawa, A. Kalinowski, T. Kaneko, K. Kato, N. Kauer, W. Kilgore, M. Kirsanov, A. Korytov, M. Kraemer, A. Kulesza, Y. Kurihara, S. Lehti, L. Magnea, F. Mahmoudi, E. Maina, F. Maltoni, C. Mariotti, B. Mellado, D. Mercier, G. Mitselmakher, G. Montagna, A. Moraes, M. Moretti, S. Moretti, I. Nakano, P. Nason, O. Nicrosini, A. Nikitenko, M. R. Nolten, F. Olness, Yu. Pakhotin, G. Pancheri, F. Piccinini, E. Pilon, R. Pittau, S. Pozzorini, J. Pumplin, W. Quayle, D. A. Ross, R. Sadykov, M. Sandhoff, V. I. Savrin, A. Schmidt, M. Schulze, S. Schumann, B. Scurlock, A. Sherstnev, P. Skands, G. Somogyi, J. Smith, M. Spira, Y. Srivastava, H. Stenzel, Y. Sumino, R. Tanaka, Z. Trocsanyi, S. Tsuno, A. Vicini, D. Wackeroth, M. M. Weber, C. Weiser, S. Willenbrock, S. L. Wu, M. Zanetti

**Category:**High Energy Physics - Phenomenology

This Report summarises the activities of the "SM and Higgs" working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. On the one hand, we performed a variety of experimental and theoretical studies on standard candles (such as W, Z, and ttbar production), treating them either as proper signals of known physics, or as backgrounds to unknown physics; we also addressed issues relevant to those non-perturbative or semi-perturbative ingredients, such as Parton Density Functions and Underlying Events, whose understanding will be crucial for a proper simulation of the actual events taking place in the detectors. On the other hand, several channels for the production of the Higgs, or involving the Higgs, have been considered in some detail. Read More

This is the user's manual of MC@NLO 3.2. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Read More

We match next-to-leading order QCD results for single-top hadroproduction with parton shower Monte Carlo simulations, according to the prescription of the MC@NLO formalism. In this way, we achieve the first practical implementation in MC@NLO of a process that has both initial- and final-state collinear singularities. We show that no difficulties of principle arise from this complication, and present selected results relevant to the Tevatron. Read More

This is the user's manual of MC@NLO 3.1. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Read More