S. Pozzorini - Santa Barbara, KITP and Zurich University

S. Pozzorini
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Name
S. Pozzorini
Affiliation
Santa Barbara, KITP and Zurich University
City
Santa Barbara
Country
United States

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High Energy Physics - Phenomenology (50)
 
High Energy Physics - Experiment (12)
 
Solar and Stellar Astrophysics (1)

Publications Authored By S. Pozzorini

High-energy jets recoiling against missing transverse energy (MET) are powerful probes of dark matter at the LHC. Searches based on large MET signatures require a precise control of the $Z(\nu\bar\nu)+$jet background in the signal region. This can be achieved by taking accurate data in control regions dominated by $Z(\ell^+\ell^-)+$jet, $W(\ell\nu)+$jet and $\gamma+$jet production, and extrapolating to the $Z(\nu\bar\nu)+$jet background by means of precise theoretical predictions. Read More

We present next-to-leading order (NLO) calculations including QCD and electroweak (EW) corrections for $2\ell2\nu$ diboson signatures with two opposite-charge leptons and two neutrinos. Specifically, we study the processes $pp\to e^+ \mu^- \nu_{e}\bar\nu_{\mu}$ and $pp\to e^+ e^-\nu\bar\nu$, including all relevant off-shell diboson channels, $W^+W^-$, $ZZ$, $\gamma Z$, as well as non-resonant contributions. Photon-induced processes are computed at NLO EW, and we discuss subtle differences related to the definition and the renormalisation of the coupling $\alpha$ for processes with initial- and final-state photons. Read More

2016Oct
Authors: D. de Florian1, C. Grojean2, F. Maltoni3, C. Mariotti4, A. Nikitenko5, M. Pieri6, P. Savard7, M. Schumacher8, R. Tanaka9, R. Aggleton10, M. Ahmad11, B. Allanach12, C. Anastasiou13, W. Astill14, S. Badger15, M. Badziak16, J. Baglio17, E. Bagnaschi18, A. Ballestrero19, A. Banfi20, D. Barducci21, M. Beckingham22, C. Becot23, G. Bélanger24, J. Bellm25, N. Belyaev26, F. U. Bernlochner27, C. Beskidt28, A. Biekötter29, F. Bishara30, W. Bizon31, N. E. Bomark32, M. Bonvini33, S. Borowka34, V. Bortolotto35, S. Boselli36, F. J. Botella37, R. Boughezal38, G. C. Branco39, J. Brehmer40, L. Brenner41, S. Bressler42, I. Brivio43, A. Broggio44, H. Brun45, G. Buchalla46, C. D. Burgard47, A. Calandri48, L. Caminada49, R. Caminal Armadans50, F. Campanario51, J. Campbell52, F. Caola53, C. M. Carloni Calame54, S. Carrazza55, A. Carvalho56, M. Casolino57, O. Cata58, A. Celis59, F. Cerutti60, N. Chanon61, M. Chen62, X. Chen63, B. Chokoufé Nejad64, N. Christensen65, M. Ciuchini66, R. Contino67, T. Corbett68, R. Costa69, D. Curtin70, M. Dall'Osso71, A. David72, S. Dawson73, J. de Blas74, W. de Boer75, P. de Castro Manzano76, C. Degrande77, R. L. Delgado78, F. Demartin79, A. Denner80, B. Di Micco81, R. Di Nardo82, S. Dittmaier83, A. Dobado84, T. Dorigo85, F. A. Dreyer86, M. Dührssen87, C. Duhr88, F. Dulat89, K. Ecker90, K. Ellis91, U. Ellwanger92, C. Englert93, D. Espriu94, A. Falkowski95, L. Fayard96, R. Feger97, G. Ferrera98, A. Ferroglia99, N. Fidanza100, T. Figy101, M. Flechl102, D. Fontes103, S. Forte104, P. Francavilla105, E. Franco106, R. Frederix107, A. Freitas108, F. F. Freitas109, F. Frensch110, S. Frixione111, B. Fuks112, E. Furlan113, S. Gadatsch114, J. Gao115, Y. Gao116, M. V. Garzelli117, T. Gehrmann118, R. Gerosa119, M. Ghezzi120, D. Ghosh121, S. Gieseke122, D. Gillberg123, G. F. Giudice124, E. W. N. Glover125, F. Goertz126, D. Gonçalves127, J. Gonzalez-Fraile128, M. Gorbahn129, S. Gori130, C. A. Gottardo131, M. Gouzevitch132, P. Govoni133, D. Gray134, M. Grazzini135, N. Greiner136, A. Greljo137, J. Grigo138, A. V. Gritsan139, R. Gröber140, S. Guindon141, H. E. Haber142, C. Han143, T. Han144, R. Harlander145, M. A. Harrendorf146, H. B. Hartanto147, C. Hays148, S. Heinemeyer149, G. Heinrich150, M. Herrero151, F. Herzog152, B. Hespel153, V. Hirschi154, S. Hoeche155, S. Honeywell156, S. J. Huber157, C. Hugonie158, J. Huston159, A. Ilnicka160, G. Isidori161, B. Jäger162, M. Jaquier163, S. P. Jones164, A. Juste165, S. Kallweit166, A. Kaluza167, A. Kardos168, A. Karlberg169, Z. Kassabov170, N. Kauer171, D. I. Kazakov172, M. Kerner173, W. Kilian174, F. Kling175, K. Köneke176, R. Kogler177, R. Konoplich178, S. Kortner179, S. Kraml180, C. Krause181, F. Krauss182, M. Krawczyk183, A. Kulesza184, S. Kuttimalai185, R. Lane186, A. Lazopoulos187, G. Lee188, P. Lenzi189, I. M. Lewis190, Y. Li191, S. Liebler192, J. Lindert193, X. Liu194, Z. Liu195, F. J. Llanes-Estrada196, H. E. Logan197, D. Lopez-Val198, I. Low199, G. Luisoni200, P. Maierhöfer201, E. Maina202, B. Mansoulié203, H. Mantler204, M. Mantoani205, A. C. Marini206, V. I. Martinez Outschoorn207, S. Marzani208, D. Marzocca209, A. Massironi210, K. Mawatari211, J. Mazzitelli212, A. McCarn213, B. Mellado214, K. Melnikov215, S. B. Menari216, L. Merlo217, C. Meyer218, P. Milenovic219, K. Mimasu220, S. Mishima221, B. Mistlberger222, S. -O. Moch223, A. Mohammadi224, P. F. Monni225, G. Montagna226, M. Moreno Llácer227, N. Moretti228, S. Moretti229, L. Motyka230, A. Mück231, M. Mühlleitner232, S. Munir233, P. Musella234, P. Nadolsky235, D. Napoletano236, M. Nebot237, C. Neu238, M. Neubert239, R. Nevzorov240, O. Nicrosini241, J. Nielsen242, K. Nikolopoulos243, J. M. No244, C. O'Brien245, T. Ohl246, C. Oleari247, T. Orimoto248, D. Pagani249, C. E. Pandini250, A. Papaefstathiou251, A. S. Papanastasiou252, G. Passarino253, B. D. Pecjak254, M. Pelliccioni255, G. Perez256, L. Perrozzi257, F. Petriello258, G. Petrucciani259, E. Pianori260, F. Piccinini261, M. Pierini262, A. Pilkington263, S. Plätzer264, T. Plehn265, R. Podskubka266, C. T. Potter267, S. Pozzorini268, K. Prokofiev269, A. Pukhov270, I. Puljak271, M. Queitsch-Maitland272, J. Quevillon273, D. Rathlev274, M. Rauch275, E. Re276, M. N. Rebelo277, D. Rebuzzi278, L. Reina279, C. Reuschle280, J. Reuter281, M. Riembau282, F. Riva283, A. Rizzi284, T. Robens285, R. Röntsch286, J. Rojo287, J. C. Romão288, N. Rompotis289, J. Roskes290, R. Roth291, G. P. Salam292, R. Salerno293, M. O. P. Sampaio294, R. Santos295, V. Sanz296, J. J. Sanz-Cillero297, H. Sargsyan298, U. Sarica299, P. Schichtel300, J. Schlenk301, T. Schmidt302, C. Schmitt303, M. Schönherr304, U. Schubert305, M. Schulze306, S. Sekula307, M. Sekulla308, E. Shabalina309, H. S. Shao310, J. Shelton311, C. H. Shepherd-Themistocleous312, S. Y. Shim313, F. Siegert314, A. Signer315, J. P. Silva316, L. Silvestrini317, M. Sjodahl318, P. Slavich319, M. Slawinska320, L. Soffi321, M. Spannowsky322, C. Speckner323, D. M. Sperka324, M. Spira325, O. Stål326, F. Staub327, T. Stebel328, T. Stefaniak329, M. Steinhauser330, I. W. Stewart331, M. J. Strassler332, J. Streicher333, D. M. Strom334, S. Su335, X. Sun336, F. J. Tackmann337, K. Tackmann338, A. M. Teixeira339, R. Teixeira de Lima340, V. Theeuwes341, R. Thorne342, D. Tommasini343, P. Torrielli344, M. Tosi345, F. Tramontano346, Z. Trócsányi347, M. Trott348, I. Tsinikos349, M. Ubiali350, P. Vanlaer351, W. Verkerke352, A. Vicini353, L. Viliani354, E. Vryonidou355, D. Wackeroth356, C. E. M. Wagner357, J. Wang358, S. Wayand359, G. Weiglein360, C. Weiss361, M. Wiesemann362, C. Williams363, J. Winter364, D. Winterbottom365, R. Wolf366, M. Xiao367, L. L. Yang368, R. Yohay369, S. P. Y. Yuen370, G. Zanderighi371, M. Zaro372, D. Zeppenfeld373, R. Ziegler374, T. Zirke375, J. Zupan376
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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 present predictions for $t \bar t$ and $t \bar t H$ production and decay at future lepton colliders including non-resonant and interference contributions up to next-to-leading order (NLO) in perturbative QCD. The obtained precision predictions are necessary for a future precise determination of the top-quark Yukawa coupling, and allow for top-quark phenomenology in the continuum at an unprecedented level of accuracy. Simulations are performed with the automated NLO Monte-Carlo framework WHIZARD interfaced to the OpenLoops matrix element generator. Read More

In this contribution recent results regarding the NLO electroweak corrections for vector boson production in association with jets are presented. Besides discussing the phenomenology of the fixed-order results, their corporation in existing NLO QCD parton shower matched and merged calculations, which can directly be used in experimental analyses, will be shown. Read More

We present theoretical predictions for the production of top-quark pairs with up to three jets at the next-to leading order in perturbative QCD. The relevant calculations are performed with Sherpa and OpenLoops. To address the issue of scale choices and related uncertainties in the presence of multiple scales, we compare results obtained with the standard scale HT/2 at fixed order and the MINLO procedure. Read More

We present a Monte Carlo generator that implements significant theoretical improvements in the simulation of top-quark pair production and decay at the LHC. Spin correlations and off-shell effects in top-decay chains are described in terms of exact matrix elements for $p p \to \ell^+\nu_{\scriptscriptstyle\ell}\, l^-\bar{\nu}_{\scriptscriptstyle l} b \bar{b}$ at NLO QCD, where the leptons $\ell$ and $l$ belong to different families, and $b$ quarks are massive. Thus, the contributions from $t\bar{t}$ and $Wt$ single-top production as well as their quantum interference are fully included. Read More

This report summarises the properties of Standard Model processes at the 100 TeV pp collider. We document the production rates and typical distributions for a number of benchmark Standard Model processes, and discuss new dynamical phenomena arising at the highest energies available at this collider. We discuss the intrinsic physics interest in the measurement of these Standard Model processes, as well as their role as backgrounds for New Physics searches. Read More

This Report summarizes the proceedings of the 2015 Les Houches workshop on Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant for high precision Standard Model calculations, (II) the new PDF4LHC parton distributions, (III) issues in the theoretical description of the production of Standard Model Higgs bosons and how to relate experimental measurements, (IV) a host of phenomenological studies essential for comparing LHC data from Run I with theoretical predictions and projections for future measurements in Run II, and (V) new developments in Monte Carlo event generators. Read More

2016May
Affiliations: 1Zurich U., 2Santa Barbara, KITP and U. Mainz, PRISMA, 3Santa Barbara, KITP and Zurich U., 4DESY, 5Zurich U.

We consider QCD radiative corrections to $W^+W^-$ production at the LHC and present the first fully differential predictions for this process at next-to-next-to-leading order (NNLO) in perturbation theory. Our computation consistently includes the leptonic decays of the $W$ bosons, taking into account spin correlations, off-shell effects and non-resonant contributions. Detailed predictions are presented for the different-flavour channel $pp\to\mu^+e^-\nu_\mu {\bar \nu}_e+X$ at $\sqrt{s}=8$ and $13$ TeV. Read More

We present next-to-leading order (NLO) predictions including QCD and electroweak (EW) corrections for the production and decay of off-shell electroweak vector bosons in association with up to two jets at the 13 TeV LHC. All possible dilepton final states with zero, one or two charged leptons that can arise from off-shell W and Z bosons or photons are considered. All predictions are obtained using the automated implementation of NLO QCD+EW corrections in the OpenLoops matrix-element generator combined with the Munich and Sherpa Monte Carlo frameworks. Read More

A precise measurement of the Higgs boson couplings to bottom and top quarks is of paramount importance during the upcoming LHC runs. We present a comprehensive analysis for the Higgs production process in association with a semi-leptonically decaying top-quark pair and subsequent Higgs boson decay into bottom quarks. Due to the highly complex final state and large Standard Model backgrounds, measuring the signal strength in this process is known to be challenging. Read More

In this talk we present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in OpenLoops together with Sherpa and Munich. As a first application, we present NLO QCD+EW predictions for the production of positively charged W bosons in association with up to three jets and for the production of a Z boson or photon in association with one jet. Read More

We present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in the OpenLoops matrix-element generator combined with the Sherpa and Munich Monte Carlo frameworks. The process-independent character of the implemented algorithms opens the door to NLO QCD+EW simulations for a vast range of Standard Model processes, up to high particle multiplicity, at current and future colliders. As a first application, we present NLO QCD+EW predictions for the production of positively charged on-shell W bosons in association with up to three jets at the Large Hadron Collider. Read More

Charged gauge boson pair production at the Large Hadron Collider allows detailed probes of the fundamental structure of electroweak interactions. We present precise theoretical predictions for on-shell $W^+W^-$ production that include, for the first time, QCD effects up to next-to-next-to-leading order in perturbation theory. As compared to next-to-leading order, the inclusive $W^+W^-$ cross section is enhanced by 9% at 7 TeV and 12% at 14 TeV. Read More

We report on the first calculation of next-to-next-to-leading order (NNLO) QCD corrections to the inclusive production of ZZ pairs at hadron colliders. Numerical results are presented for pp collisions with centre-of-mass energy ($\sqrt{s}$) ranging from 7 to 14 TeV. The NNLO corrections increase the NLO result by an amount varying from $11\%$ to $17\%$ as $\sqrt{s}$ goes from 7 to 14 TeV. Read More

We present the computation of the double real and real-virtual contributions to top-antitop pair production in the quark-antiquark channel at leading colour. The $q \bar q \to t \bar{t} g$ amplitudes contributing to the real-virtual part are computed with OpenLoops, and their numerical stability in the soft and collinear regions is found to be sufficiently high to perform a realistic NNLO calculation in double precision. The subtraction terms required at real-real and real-virtual levels are constructed within the antenna subtraction formalism extended to deal with the presence of coloured massive final state particles. Read More

Triple gauge boson hadroproduction, in particular the production of three $W$-bosons at the LHC, is considered at next-to leading order accuracy in QCD. The NLO matrix elements are combined with parton showers. Multijet merging is invoked such that NLO matrix elements with one additional jet are also included. Read More

We present differential cross sections for the production of top-quark pairs in conjunction with up to two jets, computed at next-to leading order in perturbative QCD and consistently merged with a parton shower in the Sherpa+OpenLoops framework. Top quark decays including spin correlation effects are taken into account at leading order accuracy. The calculation yields a unified description of top-pair plus multi-jet production, and detailed results are presented for various key observables at the Large Hadron Collider. Read More

We present an NLO simulation of WWbb production with massive b-quarks at the LHC. Off-shell and non-resonant contributions associated with top-pair and single-top channels and with leptonic W-boson decays are consistently taken into account using the complex-mass scheme. Thanks to the finite b-quark mass, WWbb predictions can be extended to the whole b-quark phase space, thereby including Wt-channel single-top contributions that originate from collinear g->bb splittings in the four-flavour scheme. Read More

Theoretical uncertainties in the simulation of ttbb production represent one of the main obstacles that still hamper the observation of Higgs-boson production in association with top-quark pairs in the H->bb channel. In this letter we present a next-to-leading order (NLO) simulation of ttbb production with massive b-quarks matched to the Sherpa parton shower. This allows one to extend NLO predictions to arbitrary ttbb kinematics, including the case where one or both b-jets arise from collinear g->bb splittings. Read More

We present precise predictions for four-lepton plus jets production at the LHC obtained within the fully automated Sherpa+OpenLoops framework. Off-shell intermediate vector bosons and related interferences are consistently included using the complex-mass scheme. Four-lepton plus 0- and 1-jet final states are described at NLO accuracy, and the precision of the simulation is further increased by squared quark-loop NNLO contributions in the gg -> 4l, gg -> 4l+g, gq -> 4l+q, and qq -> 4l+g channels. Read More

2013Jul
Authors: The LHC Higgs Cross Section Working Group, S. Heinemeyer1, C. Mariotti2, G. Passarino3, R. Tanaka4, 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: 1eds., 2eds., 3eds., 4eds.

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

The production of top-antitop-quark pairs at hadron colliders is interesting both in its own right as signal process, but also as background to many searches for new physics. The corresponding predictions aim at the precision level of few per cent, rendering not only the inclusion of radiative corrections of the strong and electroweak interactions relevant, but also of off-shell and finite-width effects originating from the top-quark decays t -> b W -> b l \nu_l / qq'. We report on a calculation for the full process pp -> W^+ W^- b \bar{b} -> \nu_e e^+ \mu^- \nu_\mu b \bar{b} at next-to-leading order QCD and discuss the effects of the finite widths of the top quarks and of the W bosons for selected observables. Read More

We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for \nu e e+ \mu- \bar{\nu}_{\mu}b\bar{b} production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. Read More

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 introduce a new technique to generate scattering amplitudes at one loop. Traditional tree algorithms, which handle diagrams with fixed momenta, are promoted to generators of loop-momentum polynomials that we call open loops. Combining open loops with tensor-integral and OPP reduction results in a fully flexible, very fast, and numerically stable one-loop generator. Read More

Top-antitop quark pairs belong to the most abundantly produced and precisely measurable heavy-particle signatures at hadron colliders and allow for crucial tests of the Standard Model and new-physics searches. Here we report on the calculation of the next-to-leading order (NLO) QCD corrections to hadronic WWbb production, which provides a complete NLO description of the production of top-antitop pairs and their subsequent decay into W bosons and bottom quarks, including interferences, off-shell effects, and non-resonant backgrounds. Numerical predictions for the Tevatron and the LHC are presented. Read More

We summarise predictions for top anti-top bottom anti-bottom (tTbB) production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated top anti-top Higgs production in the H -> bottom anti-bottom decay channel. The one-loop amplitudes are computed using Feynman diagrams and numerical tensor reduction. Read More

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

The next-to-leading order (NLO) QCD corrections to top anti-top bottom anti-bottom (tTbB) production at the LHC reveal that the scale choice adopted in previous lowest-order simulations underestimates the tTbB cross section by a factor two. We discuss a new dynamical scale that stabilizes the perturbative predictions and describe the impact of the corrections on the shape of distributions. We also account for the techniques employed to compute the six-particle one-loop amplitudes with high CPU efficiency. Read More

We present predictions for top anti-top bottom anti-bottom production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated top anti-top Higgs production in the Higgs -> bottom anti-bottom decay channel and to directly measure the top-quark Yukawa coupling at the LHC. The leading-order cross section is extremely sensitive to scale variations. Read More

Many highly developed Monte Carlo tools for the evaluation of cross sections based on tree matrix elements exist and are used by experimental collaborations in high energy physics. As the evaluation of one-loop matrix elements has recently been undergoing enormous progress, the combination of one-loop matrix elements with existing Monte Carlo tools is on the horizon. This would lead to phenomenological predictions at the next-to-leading order level. Read More

In the framework of the Standard Model we calculate the flavour non-universal correction for neutrino refraction in a neutrino background and verify a similar previous result for the case of ordinary-matter background. The dominant term arises at loop level and involves tau leptons circulating in the loop. These O(G_F m_tau^2) corrections to the tree-level potential provide the dominant refractive difference between nu_mu and nu_tau unless the medium contains mu or tau leptons. Read More

We report on the calculation of the full next-to-leading order QCD corrections to the production of top anti-top bottom anti-bottom (ttbb) final states at the LHC, which deliver a serious background contribution to the production of a Higgs boson (decaying into a bottom anti-bottom pair) in association with a top anti-top pair. While the corrections significantly reduce the unphysical scale dependence of the leading-order cross section, our results predict an enhancement of the ttbb production cross section by a K-factor of about 1.8. Read More

We derive logarithmically enhanced two-loop virtual electroweak corrections for arbitrary fermion-scattering processes at the TeV scale. This extends results previously obtained for massless fermion scattering to processes that involve also bottom and top quarks. The contributions resulting from soft, collinear, and ultraviolet singularities in the complete electroweak Standard Model are explicitly extracted from two-loop diagrams to next-to-leading-logarithmic accuracy including all effects associated with symmetry breaking and Yukawa interactions. Read More

The process pp -> top anti-top bottom anti-bottom + X represents a very important background reaction to searches at the LHC, in particular to top anti-top H production where the Higgs boson decays into a bottom anti-bottom pair. A successful analysis of top anti-top H at the LHC requires the knowledge of direct top anti-top bottom anti-bottom production at NLO in QCD. We take the first step in this direction upon calculating the NLO QCD corrections to the subprocess initiated by quark anti-quark annihilation. Read More

The process pp -> top anti-top bottom anti-bottom + X represents a very important background reaction to searches at the LHC, in particular to top anti-top H production where the Higgs boson decays into a bottom anti-bottom pair. A successful analysis of top anti-top H at the LHC requires the knowledge of direct top anti-top bottom anti-bottom production at next-to-leading order in QCD. We take the first step in this direction upon calculating the next-to-leading-order QCD corrections to the subprocess initiated by quark anti-quark annihilation. Read More

This report summarizes the activity on comparisons of existings tools for the standard model and on issues in jet physics by the SMHC working group during and subsequent to the Workshop "Physics at TeV Colliders", Les Houches, France, 11-29 June, 2007. Read More

We study the asymptotic behaviour of two-loop electroweak corrections at energies Q >> M_W, where logarithms of the type ln(Q/M_W) become dominant. The calculation of the leading and next-to-leading logarithmic terms for massless and massive fermion-scattering processes is summarized. The derivations are performed diagrammatically within the spontaneously broken electroweak theory. Read More

2007Aug
Affiliations: 1Karlsruhe U., TTP, 2Hamburg, DESY, 3Munich, Max Planck Inst., 4Karlsruhe U., TTP

To match the precision of present and future measurements of W-boson production at hadron colliders electroweak radiative corrections must be included in the theory predictions. In this paper we consider their effect on the transverse momentum (p_T) distribution of W bosons, with emphasis on large p_T. We evaluate the full electroweak O(alpha) corrections to the processes pp -> W+jet and p\bar p -> W+jet including virtual and real photonic contributions. Read More

To match the precision of present and future measurements of W-boson production at hadron colliders, electroweak radiative corrections must be included in the theory predictions. In this paper we consider their effect on the transverse momentum (p_T) distribution of W bosons, with emphasis on large p_T. We evaluate the full electroweak O(\alpha) corrections to the process pp -> Wj including virtual and real photonic contributions. Read More

We consider W-boson scattering at high-energy e+ e- colliders and study one-loop logarithmic electroweak corrections within the Standard Model assuming a light Higgs boson. We present explicit analytical results for W+ W- -> W+ W-. Using the equivalent vector-boson approximation, we have implemented these corrections into a Monte Carlo program for the process e+ e- -> nue anti-nue W+ W-. Read More

We consider two-loop leading and next-to-leading logarithmic virtual corrections to arbitrary processes with external massless fermions in the electroweak Standard Model at energies well above the electroweak scale. Using the sector-decomposition method and alternatively the strategy of regions we calculate the mass singularities that arise as logarithms of Q^2/MW^2, where Q is the energy scale of the considered process, and 1/\epsilon poles in D=4-2\epsilon dimensions, to one- and two-loop next-to-leading logarithmic accuracy. The derivations are performed within the complete electroweak theory with spontaneous symmetry breaking. Read More

2006Apr
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

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

We study the impact of electroweak radiative corrections on direct production of photons with high transverse momenta at hadron colliders. Analytic results for the weak one-loop corrections to the parton scattering reaction $\bar q q \to \gamma g$ and its crossed variants are presented. For the high-energy region, where the corrections are strongly enhanced by logarithms of $\hat s/M_W^2$, we derive simple asymptotic expressions which approximate the exact one-loop results with high precision. Read More

To match the precision of present and future measurements of Z-boson production at hadron colliders, electroweak radiative corrections must be included in the theory predictions. In this paper we consider their effect on the transverse momentum ($p_T$) distribution of Z bosons, with emphasis on large $p_T$. We evaluate, analytically and numerically, the full one-loop corrections for the parton scattering reaction $q\bar q \to Z g$ and its crossed variants. Read More

We present a double precision routine in Fortran for the precise and fast numerical evaluation of the two Master Integrals (MIs) of the equal mass two-loop sunrise graph for arbitrary momentum transfer in d=2 and d=4 dimensions. The routine implements the accelerated power series expansions obtained by solving the corresponding differential equations for the MIs at their singular points. With a maximum of 22 terms for the worst case expansion a relative precision of better than a part in 10^{15} is achieved for arbitrary real values of the momentum transfer. Read More