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Search for Invisible Decays of a Higgs Boson Produced in Association with a Z Boson in ATLAS

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 L. Alio 3 M. Barbero 3 C. Bertella 3 N. Bousson 3 J. C. Clémens 3 Y. Coadou 3 F. Djama 3 F. Etienne 3 L. Feligioni 3 D. Hoffmann 3 F. Hubaut 3 E. B. F. G. Knoops 3 E. Le Guirriec 3 B. Li 3 J. Maurer 3 E. Monnier 3 Y. Nagai 3 J. Odier 3 P. Pralavorio 3 A. Rozanov 3 T. Serre 3 M. Talby 3 N. Tannoury 3 E. Tiouchichine 3 S. Tisserant 3 J. Toth 3 F. Touchard 3 M. Ughetto 3 L. Vacavant 3 D. Boumediene 4 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 J. Donini 4 E. Dubreuil 4 N. Ghodbane 4 Ph. Gris 4 C. Guicheney 4 H. Liao 4 D. Pallin 4 Daniela Paredes Hernández 4 F. Podlyski 4 C. Santoni 4 Timothée Theveneaux-Pelzer 4 Loïc Valery 4 F. Vazeille 4 N. Berger 5 M. Delmastro 5 L. Di Ciaccio 5 T.K.O. Doan 5 S. Elles 5 C. Goy 5 T. Hryn'Ova 5 S. Jézéquel 5 H. Keoshkerian 5 R. Lafaye 5 J. Leveque 5 V.P. Lombardo 5 N. Massol 5 H. Przysiezniak 5 G. Sauvage 5 E. Sauvan 5 M. Schwoerer 5 T. Todorov 5 I. Wingerter-Seez 5 R. Zitoun 5 S. Abdel Khalek 6 E. Augé 6 A. Bassalat 6 S. Binet 6 C. Bourdarios 6 C. de la Taille 6 J.B. de Vivie de Regie 6 L. Duflot 6 M. Escalier 6 L. Fayard 6 D. Fournier 6 J.-F. Grivaz 6 T. Guillemin 6 S. Henrot-Versillé 6 J. Hrivnac 6 L. Iconomidou-Fayard 6 J. Idarraga 6 M. Kado 6 N. Lorenzo Martinez 6 A. Lounis 6 N. Makovec 6 L. Poggioli 6 P. Puzo 6 A. Renaud 6 D. Rousseau 6 G. Rybkin 6 J.B. Sauvan 7 J. Schaarschmidt 6 A.C. Schaffer 6 E. Scifo 6 L. Serin 6 S. Simion 6 R. Tanaka 6 H.L. Tran 6 D. Zerwas 6 Zhiqing Zhang 6 I. Koletsou 5 O. Simard 5
Abstract : A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented. No deviation from the Standard Model expectation is observed in 4.5 fb-1 (20.3 fb-1) of 7 (8) TeV pp collision data collected by the ATLAS experiment. Assuming the Standard Model rate for ZH production, an upper limit of 75%, at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125.5 GeV. The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter--nucleon scattering cross section within a Higgs-portal dark matter scenario. Limits are also set on an additional neutral Higgs boson, in the mass range 110
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G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Search for Invisible Decays of a Higgs Boson Produced in Association with a Z Boson in ATLAS. Physical Review Letters, American Physical Society, 2014, 112, pp.201802. ⟨10.1103/PhysRevLett.112.201802⟩. ⟨in2p3-00946708⟩

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