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Search for Higgs boson decays to a photon and a Z boson in pp collisions at sqrt(s)=7 and 8 TeV with the ATLAS detector

G. Aad 1 L. Alio 1 M. Barbero 1 C. Bertella 1 J. C. Clémens 1 Y. Coadou 1 F. Djama 1 L. Feligioni 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 Y. Nagai 1 J. Odier 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 N. Tannoury 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1 L. Vacavant 1 J. Donini 2 E. Dubreuil 2 N. Ghodbane 2 Ph. Gris 2 C. Guicheney 2 H. Liao 2 D. Pallin 2 Daniela Paredes Hernández 2 F. Podlyski 2 C. Santoni 2 Timothée Theveneaux-Pelzer 2 Loïc Valery 2 F. Vazeille 2 T. Beau 3 M. Bomben 3 G. Calderini 3 F. Crescioli 3 O. Davignon 3 S. de Cecco 3 A. Demilly 3 F. Derue 3 M.W. Krasny 3 D. Lacour 3 B. Laforge 3 S. Laplace 3 O. Le Dortz 3 G. Lefebvre 3 B. Malaescu 3 G. Marchiori 3 I. Nikolic-Audit 3 J. Ocariz 3 S. Pires 4 C. Rangel-Smith 3 M. Ridel 3 L. Roos 3 S. Trincaz-Duvoid 3 F. Vannucci 3 D. Varouchas 4 H. Abreu 4 H. Bachaou 4 F. Balli 4 F. Bauer 4 N. Besson 4 J.-B. Blanchard 4 N.M. Bolnet 4 M. Boonekamp 4 L. Chevalier 4 M. Dano Hoffmann 4 F. Deliot 4 J. Ernwein 4 A.I. Etienvre 5 A. Formica P.F. Giraud 4 H.M.X. Grabas 2 C. Guyot 4 S. Hassani W. Kozanecki 4 E. Lancon 4 J.F. Laporte 4 C. Maiani 4 P. Mal 4 B. Mansoulie 4 H. Martinez 2 N. Meric 4 J.-P. Meyer 4 L. Mijovic 4 R. Nicolaidou 4 A. Ouraou 4 E. Protopapadaki 4 B. Resende 4 C.R. Royon 4 L. L. Schoffel 4 Ph. Schune 4 Ph. Schwemling 4 J. Schwindling 4 D. Tsionou 4 N. Vranjes 4 M. Xiao 4 G. Rahal 5 S. Albrand 6 J. Brown 6 B. Clement 6 J. Collot 6 S. Crépé-Renaudin 6 B. Dechenaux 6 P.A. Delsart 6 C. Gabaldon 6 M.H. Genest 6 J.Y. Hostachy 6 B.T. Le 6 F. Ledroit-Guillon 6 A. Lleres 6 A. Lucotte 6 F. Malek 6 C. Monini 6 J. Stark 6 B. Trocmé 6 Z. Barnovska 7 N. Berger 7 M. Delmastro 7 L. Di Ciaccio 7 T.K.O. Doan 7 S. Elles 7 C. Goy 7 T. Hryn'Ova 7 S. Jézéquel 7 H. Keoshkerian 7 R. Lafaye 7 J. Leveque 7 V.P. Lombardo 7 N. Massol 7 H. Przysiezniak 7 G. Sauvage 7 E. Sauvan 7 M. Schwoerer 7 T. Todorov 7 I. Wingerter-Seez 7 R. Zitoun 7 S. Abdel Khalek 8 E. Augé 8 A. Bassalat 8 S. Binet 8 C. Bourdarios 8 C. de la Taille 8 J.B. de Vivie de Regie 8 L. Duflot 8 M. Escalier 8 L. Fayard 8 D. Fournier 8 J.-F. Grivaz 8 T. Guillemin 8 S. Henrot-Versillé 8 J. Hrivnac 8 L. Iconomidou-Fayard 8 J. Idarraga 8 M. Kado 8 N. Lorenzo Martinez 8 A. Lounis 8 N. Makovec 8 L. Poggioli 8 P. Puzo 8 A. Renaud 8 D. Rousseau 8 G. Rybkin 8 J.B. Sauvan 9 J. Schaarschmidt 8 A.C. Schaffer 8 E. Scifo 8 L. Serin 8 S. Simion 8 R. Tanaka 8 H.L. Tran 8 D. Zerwas 8 Zhiqing Zhang 8 I. Koletsou 7 O. Simard 7
Abstract : A search is reported for a neutral Higgs boson in the decay channel H->Z gamma, Z->l+l- (l=e, mu), using 4.5 fb-1 of pp collisions at sqrt(s) = 7 TeV and 20.3 fb-1 of pp collisions at sqrt(s) = 8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, m(llgamma), is consistent with the Standard Model hypothesis in the investigated mass range of 120-150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120-150 GeV between 0.13 and 0.5 pb for sqrt(s)=8 TeV at 95% confidence level.
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Submitted on : Friday, February 14, 2014 - 9:25:14 AM
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G. Aad, L. Alio, M. Barbero, C. Bertella, J. C. Clémens, et al.. Search for Higgs boson decays to a photon and a Z boson in pp collisions at sqrt(s)=7 and 8 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2014, 732, pp.8-27. ⟨10.1016/j.physletb.2014.03.015⟩. ⟨in2p3-00946737⟩

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