Determination of spin and parity of the Higgs boson in the [Formula: see text] decay channel with the ATLAS detector.

G Aad,B Nicquevert,R Ishmukhametov,D M Gingrich,E Torrence,M Moreno Llácer,K K Gan,A Polini,K M Mercurio,E Musto,M C N Fiolhais,V M Kotov,L Hooft Van Huysduynen,G T Fletcher,G Calderini,R Kowalewski,S Stern,T Bain,A Hasib,H Ghazlane,G Nunes Hanninger,A Ferrer,B Gibbard,M J Shochet,S Kaneti,A Altheimer,E Piccaro,P Mättig,M Morii,A Artamonov,D Gillberg,L Köpke,S J Wollstadt,G Compostella,P Gagnon,S Cabrera Urbán,W S Lockman,V Boldea,G Cortiana,L Tremblet,C Dallapiccola,H Kagan,A Henrichs,V Castillo Gimenez,T Kohriki,A Boveia,B Stugu,S Willocq,W Edson,G Susinno,U De Sanctis,M Fiascaris,H G Sander,R Caminal Armadans,S Gadomski,S De Cecco,F Tarrade,K Sliwa,Y A Kurochkin,V Chernyatin,K K Temming,G Polesello,A A Nepomuceno,Y V Grishkevich,P Loscutoff,J R Goddard,D Schouten,Y Silver,S Swedish,E Von Toerne,N Ghodbane,J Bronner,T Dohmae,T Schwindt,D De Pedis,G Marchiori,G Sedov,F Lo Sterzo,H Czirr,R Sandstroem,S Schaetzel,M J Woudstra,S Ferrag,C Schwanenberger,M Hohlfeld,N Tannoury,S L Wu,L K 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Farthouat,D Oliveira Damazio,K E Selbach,Z Hajduk,N B Sinev,C A Chavez Barajas,C Suhr,F Garberson,G Mc Goldrick,R Di Nardo,N Bousson,P Catastini,P Stavina,T Nunnemann,G Lehmann Miotto,G Akimoto,L Manhaes De Andrade Filho,E Badescu,P Morettini,G N Taylor,D Boscherini,V Sopko,A Salamon,S F Brazzale,W Kozanecki,C Da Via,S V Mouraviev,M Tylmad,M Flechl,O M Kind,Y Hernández Jiménez,Y F Ryabov,E Yu Soldatov,H Namasivayam,M Sosebee,C Di Donato,M Aurousseau,I Van Vulpen,G Duckeck,L A Kogan,E Strauss,M I Gostkin,R Bartoldus,M Medinnis,N Van Eldik,N A Mccubbin,T P A Åkesson,C Hengler,R K Daya-Ishmukhametova,B Di Micco,J Zhong,J A Klinger,A Koutsman,C J Oram,B A Dolgoshein,I Chalupkova,P True,R Mandrysch,D Lissauer,E Jansen,K Amako,A Di Ciaccio,R T Chislett,H M Braun,D T Pignotti,Y Amaral Coutinho,G Lenzen,P Sinervo,V Grassi,C Maiani,D Macina,C P Buszello,P Chang,A Firan,J Huston,B Di Girolamo,X Hu,M El Kacimi,J S Keller,S Rolli,S Youssef,I Massa,L Aperio Bella,A Seiden,P Jussel,W Van Den 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Fang,P J Hsu,P V Tsiareshka,A Maio,O Biebel,A T Law,P Berta,V B Vinogradov,L Plazak,L Jeanty,C Oropeza Barrera,W Lukas,S Heim,A Vartapetian,G Siragusa,K Assamagan,T Masubuchi,O L Rezanova,A Annovi,J Alison,M Kaneda,V Vercesi,S Cole,N P Readioff,A Floderus,A Hrynevich,B Zhou,H Liao,A Nelson,H Weits,G Qin,S A Stucci,Y Takubo,A P Colijn,P Ioannou,S Miglioranzi,A Ouraou,D Britton,D A A Geerts,A A Snesarev,D Shoaleh Saadi,S Schramm,L A M Wiik-Fuchs,A I Butt,C Bini,Y Rozen,K Sapp,D Sampsonidis,M Kocian,J Maneira,J T Baines,P Rose,C Schiavi,W Vandelli,S George,H Bilokon,F Fassi,A J Barr,M Thomson,R Iuppa,R Brock,F Nuti,S Argyropoulos,R Hertenberger,K Ikematsu,K Meier,F Anghinolfi,F Ceradini,S Chekanov,A Juste Rozas,R D Mudd,J Nadal,N E Pettersson,J A Valls Ferrer,J Kirk,E Guido,J C-L Tseng,G Mikenberg,R Hickling,M G Vincter,M Klein,A Ereditato,E Protopapadaki,A Dudarev,T Tashiro,S P Amor Dos Santos,K Schmieden,W R Spearman,S Odaka,E Torró Pastor,A Lehan,S Harkusha,D Golubkov,A J Turvey,O 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Bogdanchikov,O Zenin,K Lie,R Cardarelli,P Bussey,W Okamura,Y Minami,L Tompkins,S T French,L Massa,T Heck,A Valero,J Haley,Y Makida,M Janus,M C Stockton,I Koletsou,M C Kruse,D Emeliyanov,O L Fedin

doi:10.1140/epjc/s10052-015-3436-3

Abstract

Studies of the spin and parity quantum numbers of the Higgs boson in the WW^* rightarrow e nu mu nu final state are presented, based on proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb^{-1} at a centre-of-mass energy of sqrt{s}=8 TeV. The Standard Model spin-parity J^{CP} = 0^{++} hypothesis is compared with alternative hypotheses for both spin and CP. The case where the observed resonance is a mixture of the Standard-Model-like Higgs boson and CP-even (J^{CP} = 0^{++}) or CP-odd (J^{CP} = 0^{+-}) Higgs boson in scenarios beyond the Standard Model is also studied. The data are found to be consistent with the Standard Model prediction and limits are placed on alternative spin and CP hypotheses, including CP mixing in different scenarios.

Highlights

This paper presents studies of the spin and parity quantum numbers of the newly discovered Higgs particle [1,2] in the W W ∗ → eνμν final state, where only final states with opposite-charge, different-flavour leptons (e, μ) are considered
The Standard Model J P = 0+ hypothesis for the Higgs boson is compared to alternative spin/parity hypotheses using 20.3 fb−1 of the proton–proton collis√ion data collected by the ATLAS experiment at the LHC at s = 8 TeV and corresponding to the full data set of 2012
For the spin-2 benchmarks, the Standard Model (SM) hypothesis is favoured in all tests in data and the alternative model is disfavoured at 84.5 % confidence level (CL) for the model with universal couplings and excluded at 92.5–99.4 % CL for the benchmark models with non-universal couplings

Summary

Introduction

This paper presents studies of the spin and parity quantum numbers of the newly discovered Higgs particle [1,2] in the W W ∗ → eνμν final state, where only final states with opposite-charge, different-flavour leptons (e, μ) are considered. To simulate the alternative Higgs-boson hypotheses, the MadGraph5_aMC@NLO [5] generator is adopted It includes terms of higher order (αS3) in the Lagrangian, in the parity of the Higgs resonance is studied by testing the compatibility of the data with a beyond-theStandard-Model (BSM) CP-even or CP-odd Higgs boson [8]. 369 12.2 12.7 163 7.31 0.733 0.504 resonant gluon fusion is calculated and modelled to LO in αS with gg2VV, including both W W and Z Z production and their interference; tt production is normalised to the calculation at NNLO in αS, with resummation of higher-order terms to NNLL accuracy, evaluated with Top++2.0 [38]; singletop-quark processes are normalised to NNLL, following the calculations from Refs. The W W background and the dominant backgrounds involving top-quark production (tt and W t) are modelled using the Powheg + Pythia event generator [42,43,44,45].

Methods

Results

Conclusion