# O. Cata - LMU, Munich

## Contact Details

NameO. Cata |
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AffiliationLMU, Munich |
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CityMünchen |
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CountryGermany |
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## Pubs By Year |
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## Pub CategoriesHigh Energy Physics - Phenomenology (50) High Energy Physics - Lattice (10) High Energy Physics - Experiment (8) Nuclear Theory (4) Cosmology and Nongalactic Astrophysics (3) |

## Publications Authored By O. Cata

Motivated by the fact that, so far, the whole body of evidence for dark matter is of gravitational origin, we study the decays of dark matter into Standard Model particles mediated by gravity portals, i.e., through nonminimal gravitational interactions of dark matter. 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:**

^{1}eds.,

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

^{11}The LHC Higgs Cross Section Working Group,

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^{13}The LHC Higgs Cross Section Working Group,

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^{15}The LHC Higgs Cross Section Working Group,

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^{25}The LHC Higgs Cross Section Working Group,

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^{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 consider the Standard Model extended by a heavy scalar singlet in different regions of parameter space and construct the appropriate low-energy effective field theories up to first nontrivial order. This top-down exercise in effective field theory is meant primarily to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the relation between them. We discuss power-counting aspects and the transition between both effective theories on the basis of the model, confirming in all cases the rules and procedures derived in previous works from a bottom-up approach. Read More

We consider the Standard Model extended with a dark matter particle in curved spacetime, motivated by the fact that the only current evidence for dark matter is through its gravitational interactions, and we investigate the impact on the dark matter stability of terms in the Lagrangian linear in the dark matter field and proportional to the Ricci scalar. We show that this "gravity portal" induces decay even if the dark matter particle only has gravitational interactions, and that the decay branching ratios into Standard Model particles only depend on one free parameter: the dark matter mass. We study in detail the case of a singlet scalar as dark matter candidate, which is assumed to be absolutely stable in flat spacetime due to a discrete $Z_2$ symmetry, but which may decay in curved spacetimes due to a $Z_2$-breaking non-minimal coupling to gravity. Read More

In a recent paper [1] a master formula has been presented for the power counting of a general effective field theory. We first show that this master formula follows immediately from the concept of chiral dimensions (loop counting), together with standard dimensional analysis. Subsequently, [1] has disputed the relevance of chiral counting for chiral Lagrangians, and in particular for the electroweak chiral Lagrangian including a light Higgs boson. Read More

I review the main features of the effective field theory (EFT) behind scenarios of dynamical electroweak symmetry breaking, placing particular emphasis on the systematics and the parallels that can be drawn with Chiral Perturbation Theory. The notion of chiral dimensions will be introduced and shown to be the right tool to describe nonlinear expansions. I will also discuss why such an EFT is of interest in phenomenological studies at the LHC. Read More

In a recent paper we showed that the electroweak chiral Lagrangian at leading order is equivalent to the conventional $\kappa$ formalism used by ATLAS and CMS to test Higgs anomalous couplings. Here we apply this fact to fit the latest Higgs data. The new aspect of our analysis is a systematic interpretation of the fit parameters within an EFT. Read More

We examine the constraints coming from incorporating the full Standard Model gauge symmetry into the effective field theory description of flavor processes, using semileptonic decays as paradigmatic examples. Depending on the dynamics triggering electroweak symmetry breaking, different patterns of correlations between the Wilson coefficients arise. Interestingly, this implies that flavor experiments are capable of shedding light upon the nature of the Higgs boson without actually requiring Higgs final states. Read More

We propose a parametrization of anomalous Higgs-boson couplings that is both systematic and practical. It is based on the electroweak chiral Lagrangian, including a light Higgs boson, as the effective field theory (EFT) at the electroweak scale $v$. This is the appropriate framework for the case of sizeable deviations in the Higgs couplings of order $10\%$ from the Standard Model, considered to be parametrically larger than new-physics effects in the sector of electroweak gauge interactions. Read More

We consider the electroweak chiral Lagrangian, including a light scalar boson, in the limit of small $\xi=v^2/f^2$. Here $v$ is the electroweak scale and $f$ is the corresponding scale of the new strong dynamics. We show how the conventional SILH Lagrangian, defined as the effective theory of a strongly-interacting light Higgs (SILH) to first order in $\xi$, can be obtained as a limiting case of the complete electroweak chiral Lagrangian. Read More

The stability of dark matter is normally achieved by imposing extra symmetries beyond those of the Standard Model of Particle Physics. In this paper we present a framework where the dark matter stability emerges as a consequence of the Standard Model symmetries. The dark matter particle is an antisymmetric tensor field (analogous to the one used for spin-1 mesons in QCD), singlet under the Standard Model gauge group. Read More

If electroweak symmetry breaking is driven by a new strongly-coupled dynamical sector, one expects their bound states to appear at the TeV scale or slightly below. However, electroweak precision data imposes severe constraints on most of the existing models, putting them under strain. Conventional models require the new composite states to come in pairs of rather heavy, close to degenerate spin-1 resonances. Read More

We discuss the systematics of power counting in general effective field theories, focussing on those that are nonrenormalizable at leading order. As an illuminating example we consider chiral perturbation theory gauged under the electromagnetic $U(1)$ symmetry. This theory describes the low-energy interactions of the octet of pseudo-Goldstone bosons in QCD with photons and has been discussed extensively in the literature. Read More

We compute the fully differential rate for the Higgs-boson decay $h\to Z\ell^+\ell^-$, with $Z\to\ell^{'+}\ell^{'-}$. For these processes we assume the most general matrix elements within an effective Lagrangian framework. The electroweak chiral Lagrangian we employ assumes minimal particle content and Standard Model gauge symmetries, but is otherwise completely general. Read More

**Affiliations:**

^{1}LMU, Munich

**Category:**High Energy Physics - Phenomenology

I review the current status of nonleptonic kaon decays, placing special emphasis on the recent theoretical progress. In particular, I concentrate on 3 points: (i) the improved determination of \epsilon_K, including both perturbative and nonperturbative contributions; (ii) the efforts to tame (K -> 2\pi) transitions in lattice QCD; and (iii) the use of holographic methods to solve the vector meson dominance puzzle in (K -> 3\pi). Read More

We consider the Standard Model, including a light scalar boson $h$, as an effective theory at the weak scale $v=246\,{\rm GeV}$ of some unknown dynamics of electroweak symmetry breaking. This dynamics may be strong, with $h$ emerging as a pseudo-Goldstone boson. The symmetry breaking scale $\Lambda$ is taken to be at $4\pi v$ or above. Read More

If the dynamics behind EWSB are of strongly-coupled nature, the Standard Model ceases to be renormalizable and should be instead understood as an effective field theory (EFT). Here I will discuss the systematics behind this effective field theory description. My focus will be on deriving a consistent power-counting formula and building the basis of NLO operators. Read More

I briefly review the construction of the effective field theory of a nonlinearly realized electroweak symmetry breaking and apply it to the study of gauge boson pair production. I will consider WW, ZZ and \gamma Z production at linear colliders as reference illustrative examples. I will show that in all cases a consistent effective field theory treatment allows to encode the dominant new physics effects entirely as gauge-fermion vertex corrections. Read More

A complete and systematic effective field theory analysis of new physics effects in \bar{f}f -> ZZ and \bar{f}f -> \gamma Z is performed. Results are presented for the different initial and final-state polarized differential cross sections in terms of oblique, gauge-fermion and neutral triple gauge corrections (nTGC). Phenomenological signatures for new physics detection at the LHC and at future linear colliders are discussed. Read More

We analyze new physics contributions to $e^+e^-\to W^+W^-$ at the TeV energy scale, employing an effective field theory framework. A complete basis of next-to-leading order operators in the standard model effective Lagrangian is used, both for the nonlinear and the linear realization of the electroweak sector. The elimination of redundant operators via equations-of-motion constraints is discussed in detail. Read More

Motivated by the recent evidence for direct CP-violation in D0 -> h+h- decays, we provide an exhaustive study of both Cabibbo-favored and Cabibbo-suppressed (singly and doubly) D0 -> h1+h2-l+l- decays. In particular, we study the Dalitz plot for the long-distance contributions in the (m_{ll}^2,m_{hh}^2) parameter space. We find that near-resonant effects, i. Read More

We consider the Standard Model as an effective theory at the weak scale $v$ of a generic new strong interaction that dynamically breaks electroweak symmetry at the energy scale $\Lambda\sim $ (few) TeV. Assuming only the minimal field content with the Standard Model fermions and gauge bosons, but without a light Higgs particle, we construct the complete Lagrangian through next-to-leading order, that is, including terms of order $v^2/\Lambda^2$. The systematics behind this expansion is clarified. Read More

Being a determination at low energies, the analysis of hadronic tau decay data provides a rather precise determination of the strong coupling alpha_s after evolving the result to M_Z. At such a level of precision, even small non-perturbative effects become relevant for the central value and error. While those effects had been taken into account in the framework of the operator product expansion, contributions going beyond it, so-called duality violations, have previously been neglected. Read More

We study the decay K^+ -> pi^+ pi^0 e^+ e^-, currently under analysis by the NA62 Collaboration at CERN. In particular, we provide a detailed analysis of the Dalitz plot for the long-distance, gamma^*-mediated, contributions (Bremsstrahlung, direct emission and its interference). We also examine a set of asymmetries to isolate genuine short-distance effects. Read More

We discuss some key issues associated with duality-violating and non-perturbative OPE contributions to the theoretical representations of light quark current-current two-point functions and relevant to precision determinations of alpha_s from hadronic tau decay and electroproduction cross-section data. We demonstrate that analyses with an explicit representation of duality-violating effects are required to bring theoretical errors in such extractions under control, motivating the accompanying paper in these proceedings, which presents the results of such an analysis. Read More

The finite energy sum rule extraction of the strong coupling {\alpha}_s from hadronic {\tau} decay data provides one of its most precise experimental determinations. As precision improves, small non-perturbative effects become increasingly relevant to both the central value and error. Here we present a new framework for this extraction employing a physically motivated model to accommodate violations of quark-hadron duality and enforcing a consistent treatment of higher-dimension operator product expansion contributions. Read More

We discuss a preliminary study of the impact of duality violations on extractions from tau decay data of the D=6 VEVs which determine chiral limit Standard Model K-->pi pi matrix elements of the electroweak penguin operators. Read More

We present a new framework for the extraction of the strong coupling from hadronic \tau decays through finite-energy sum rules. Our focus is on the small, but still significant non-perturbative effects that, in principle, affect both the central value and the systematic error. We employ a quantitative model in order to accommodate violations of quark-hadron duality, and enforce a consistent treatment of the higher-dimensional contributions of the Operator Product Expansion to our sum rules. Read More

We apply the double-trace formalism to incorporate nonleptonic weak interactions of hadrons into holographic models of the strong interactions. We focus our attention upon $\Delta S=1$ nonleptonic kaon decays. By working with a Yang-Mills--Chern-Simons 5-dimensional action, we explicitly show how, at low energies, one recovers the $\Delta S=1$ weak chiral Lagrangian for both the anomalous and nonanomalous sectors. Read More

We discuss the quantitative impact of duality violations on the determination of the strong coupling constant from hadronic tau decays, based on a preliminary analysis of OPAL data. Read More

Evidence is presented for the necessity of including duality violations in a consistent description of spectral function moments employed in the precision determination of $\alpha_s$ from $\tau$ decay. A physically motivated ansatz for duality violations in the spectral functions enables us to perform fits to spectral moments employing both pinched and unpinched weights. We describe our analysis strategy and provide some preliminary findings. Read More

We study the viability of generic Higgsless models at low energies when compliance with EWPO and unitarity constraints up to the TeV scale are imposed. Our analysis shows that consistency with S and T can be achieved at the one-loop level even with a single light vector state, m_V <= 500 GeV. However, this scenario turns out to be strongly disfavored when direct resonance searches at the Tevatron are also taken into account. Read More

**Affiliations:**

^{1}IFIC & Universitat de Valencia

**Category:**High Energy Physics - Phenomenology

Commonly used techniques to study non-perturbative aspects of the strong interactions have a deep connection with rational approximants, and in particular with Pad\'e approximants to meromorphic functions. However, only recently this connection has been acknowledged and efforts at fully exploiting it are only starting. In this article I will briefly review the most prominent techniques used in non-perturbative strong interactions with special emphasis on its relation with Pad\'e approximants. Read More

**Affiliations:**

^{1}Naples U. & INFN, Naples,

^{2}Valencia U. & IFIC,

^{3}INFN, Naples

**Category:**High Energy Physics - Phenomenology

We study the anomalous electromagnetic pion form factor $F_{\pi^0\gamma^*\gamma^*}$ with a set of holographic models. By comparing with the measured value of the linear slope, some of these models can be ruled out. From the remaining models we obtain predictions for the low-energy quadratic slope parameters of $F_{\pi^0\gamma^*\gamma^*}$, currently out of experimental reach but testable in the near future. Read More

We study real (massive) antisymmetric tensors of rank two in holographic models of QCD based on the gauge/string duality. Our aim is to understand in detail how the AdS/CFT correspondence describes correlators with tensor currents in QCD. To this end we study a set of bootstrapped correlators with spin-1 vector and tensor currents, imposing matching to QCD at the partonic level. Read More

**Affiliations:**

^{1}LNF

**Category:**High Energy Physics - Phenomenology

Conventional methods to determine non-perturbative parameters in QCD, such as the different variants of QCD sum rules or the minimal hadronic approximation, combine a certain degree of matching to QCD with inputs from hadronic parameters. The latter introduce systematic errors difficult to quantify. In this paper I will apply a method based on rational approximant theory where matching is maximized and no hadronic inputs are used, thereby leading to simple analytical relations between high and low energy parameters. Read More

**Affiliations:**

^{1}LNF, Frascati,

^{2}MPI, Munich

In this letter we compute the leading chiral corrections to the ratio between the tensor and the vector decay couplings for the lowest lying vector meson multiplet (rho, K^*, phi). We show that the leading chiral logarithms arise from tadpole contributions and are therefore entirely fixed by chiral symmetry, while the next to leading corrections are purely analytic. Interestingly, the flavour structure of the chiral logarithms implies that only the rho meson is sensitive to pion logarithms. Read More

We study the Drell-Yan production of heavy vector and axial-vector states of generic Higgsless models at hadron colliders. We analyse in particular the l+l-, WZ, and three SM gauge boson final states. In the l+l- case we show how present Tevatron data restricts the allowed parameter space of these models. Read More

**Affiliations:**

^{1}INFN, Frascati,

^{2}SFSU,

^{3}UAB-Ifae

Duality Violations (DVs) is a nickname for the failure of the Operator Product Expansion to describe QCD correlators on the physical axis. Using a physically motivated ansatz, a fit to the spectral functions allows us to get a quantitative estimate for the amount of DVs present in tau data. The quality of the fit turns out to be better than expected. Read More

**Affiliations:**

^{1}Frascati,

^{2}SFSU,

^{3}IFAE/UAB

**Category:**High Energy Physics - Phenomenology

With the help of a physically motivated ansatz, which is fitted to the data, we estimate the size of possible duality violations in hadronic tau decay. The result is that the uncertainty associated with these violations could impact the alpha_s determination from the total decay width at a level which we estimate to be \delta alpha_s(m_tau) \sim 0.003-0. Read More

We discuss the issue of duality violations in hadronic tau decay. After introducing a physically motivated ansatz for duality violations, we estimate their possible size by fitting this ansatz to the tau experimental data provided by the ALEPH collaboration. Our conclusion is that these data do not exclude significant duality violations in tau decay. Read More

Collinear fields in soft collinear effective theory (SCET) can be made invariant under collinear gauge transformations by multiplying them with collinear Wilson lines. We discuss how we can quantize SCET directly in terms of these gauge invariant fields, allowing to directly calculate S matrix elements using the gauge invariant collinear fields. We also show how for each collinear direction SCET can be written in terms of fields whose interactions are given by the usual QCD Lagrangian, and how external operators coupling these different directions can be constructed. Read More

**Affiliations:**

^{1}LBL,

^{2}SFSU,

^{3}UAB/IFAE

There are some indications from recent determinations of the strong coupling constant alpha_s and the gluon condensate that the Operator Product Expansion may not be accurate enough to describe non-perturbative effects in hadronic tau decays. This breakdown of the Operator Product Expansion is usually referred to as being due to ``Duality Violations.'' With the help of a physically motivated model, we investigate these duality violations. Read More

**Affiliations:**

^{1}LBNL,

^{2}IFIC

**Category:**High Energy Physics - Phenomenology

We report on a relation between the decay constants of \rho-like J^{PC}=1^{--} vector mesons, which arises solely from the perturbative analysis of the VV, TT and VT correlators at order \alpha_s^0 in the large-N_c limit. We find f_{V}^T/f_{V}=1/\sqrt{2} for highly excited states together with a pattern of alternation in sign. Quite remarkably, recent lattice determinations reported f_{\rho}^T/f_{\rho}=0. Read More

We construct the most general chirally-invariant Lagrangian for mesons in the presence of external sources coupled to the tensor current \bar{\psi}\sigma_{\mu\nu}\psi. In order to have only even terms in the chiral expansion, we consider the new source of O(p^2). With this choice, we build the even-parity effective Lagrangian up to the p^6-order (NLO). Read More

Migdal's model on the spectrum of vector mesons is reassessed. We discuss how its departure from a Pade approximant is closely linked to the issue of quark-hadron duality breakdown. We also show that Migdal's model is not truly a model of large-Nc QCD. Read More

We reassess a work done by Migdal on the spectrum of low-energy vector mesons in QCD in the light of the AdS-QCD correspondence. Recently, a tantalizing parallelism was suggested between Migdal's work and a family of holographic duals of QCD. Despite the intriguing similarities, both approaches face a major drawback: the spectrum is in conflict with well-tested Regge scaling. Read More

**Affiliations:**

^{1}UAB-IFAE,

^{2}UAB-IFAE and SFSU,

^{3}UAB-IFAE

We examine whether the fact that QCD is chirally invariant at short distances necessarily leads to the prediction that hadrons form approximate parity doublets, as has been recently put forward by Glozman and collaborators. We show that this is not the case, and we exhibit some of the pitfalls of trying to link the operator product expansion to the hadron spectrum. We illustrate our arguments within a model for scalar and pseudo-scalar mesons used recently by Shifman to argue for parity doubling. Read More

**Affiliations:**

^{1}IFAE and UAB

**Category:**High Energy Physics - Phenomenology

This PhD Thesis is mainly devoted to the study of hadronic matrix elements of kaons. Its inner structure can be divided in three parts. In Chapter 3 we address the issue of quantum corrections in Resonance Chiral Lagrangians with the aid of the 1/N_c expansion. Read More

**Affiliations:**

^{1}IFAE and UAB

**Category:**High Energy Physics - Phenomenology

Recent sum rule analyses on the