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Evidence for the spin-0 nature of the Higgs boson using ATLAS data

G. Aad S. Albrand 1 J. Brown 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 B. Dechenaux 1 T. Delemontex 1 P.A. Delsart 1 C. Gabaldon 1 M.H. Genest 1 J.Y. Hostachy 1 E. Laisne 1 B.T. Le 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 C. Monini 1 J. Stark 1 X. Sun 1 B. Trocmé 1 G. Rahal 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 J. Donini 3 E. Dubreuil 3 N. Ghodbane 3 Ph. Gris 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 Daniela Paredes Hernández 3 F. Podlyski 3 C. Santoni 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 L. Alio 4 M. Barbero 4 C. P. Bee 4 C. Bertella 4 N. Bousson 4 J. C. Clémens 4 Y. Coadou 4 F. Djama 4 F. Etienne 4 L. Feligioni 4 D. Hoffmann 4 F. Hubaut 4 E. B. F. G. Knoops 4 E. Le Guirriec 4 B. Li 5 J. Maurer 4 E. Monnier 4 Y. Nagai 4 J. Odier 4 P. Pralavorio 4 A. Rozanov 4 T. Serre 4 M. Talby 4 N. Tannoury 4 E. Tiouchichine 4 S. Tisserant 4 J. Toth 4 F. Touchard 4 M. Ughetto 4 L. Vacavant 4 N. Berger 6 J. Colas 6 M. Delmastro 6 L. Di Ciaccio 6 T.K.O. Doan 6 S. Elles 6 C. Goy 6 T. Hryn'Ova 6 S. Jézéquel 6 H. Keoshkerian 6 R. Lafaye 6 J. Leveque 6 V.P. Lombardo 6 M. Maeno 6 N. Massol 6 P. Perrodo 6 E. Petit 6 H. Przysiezniak 6 G. Sauvage 6 E. Sauvan 6 M. Schwoerer 6 T. Todorov 6 I. Wingerter-Seez 6 R. Zitoun 6 S. Abdel Khalek 7 E. Augé 7 S. Binet 7 C. Bourdarios 7 C. de la Taille 7 J.B. de Vivie de Regie 7 L. Duflot 7 M. Escalier 7 L. Fayard 7 D. Fournier 7 J.-F. Grivaz 7 T. Guillemin 7 S. Henrot-Versillé 7 J. Hrivnac 7 L. Iconomidou-Fayard 7 J. Idarraga 7 M. Kado 7 N. Lorenzo Martinez 7 A. Lounis 7 N. Makovec 7 F. Niedercorn 7 L. Poggioli 7 P. Puzo 7 A. Renaud 7 D. Rousseau 7 G. Rybkin 7 J.B. Sauvan 7 J. Schaarschmidt 7 A.C. Schaffer 7 E. Scifo 7 L. Serin 7 S. Simion 7 R. Tanaka 7 M. Teinturier 7 H.L. Tran 7 D. Zerwas 7 Zhiqing Zhang 7
Abstract : Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton-proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity JP = 0+ hypothesis is compared with alternative hypotheses using the Higgs boson decays H->gamma gamma, H -> ZZ -> 4 leptons and H->WW -> l nu l nu, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb-1 collected at a centre-of-mass energy of sqrt(s) = 8 TeV. For the H -> ZZ -> 4-lepton decay mode the dataset corresponding to an integrated luminosity of 4.6 fb-1 collected at sqrt(s) = 7 TeV is added. The data are compatible with the Standard Model JP = 0+ quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this letter, namely some specific JP = 0-; 1+; 1-; 2+ models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the JP = 2+ model, of the relative fractions of gluon-fusion and quark-antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred.
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Submitted on : Monday, July 8, 2013 - 8:00:34 AM
Last modification on : Thursday, November 26, 2020 - 3:39:06 PM

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G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Evidence for the spin-0 nature of the Higgs boson using ATLAS data. Physics Letters B, Elsevier, 2013, 726, pp.120-144. ⟨10.1016/j.physletb.2013.08.026⟩. ⟨in2p3-00842149⟩

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