Search for decays of the 125 GeV Higgs boson into a Z boson and a \u03c1 or \u03d5 meson

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Bihan,L Bianchini,Y Mao,C Dozen,A Skuja,X Zuo,K Nash,J Pata,F Feindt,D Lelas,A Staiano,E Manca,C Roland,A Lotfy,J Alison,Y Kubota,F Meng,B Kailasapathy,I Zhizhin,M Maggi,S Ha,A Bermúdez Martínez,B Bilki,P Schütze,D Noonan,N Emriskova,B Ille,Z S Demiroglu,L Cadamuro,C Camen,G Karapinar,D Pinna,D D’Enterria,T Ruggles,W G D Dharmaratna,G Ramirez-Sanchez,R Klanner,A Malara,L Benussi,L I Estevez Banos,S Dutta,F Moscatelli,T Rovelli,B Chiarito,S Ghosh,S Malhotra,C Mclean,K Lannon,M Reichmann,A Spiezia,H Wang,D Rosenzweig,S Sekmen,C Kar,D Fasanella,V Hagopian,D Gulhan,M Nguyen,M T Lucchini,D Denegri,M Saunders,T Eichhorn,M Dragicevic,G Sultanov,M Ressegotti,S Grünendahl,I Ojalvo,L Cristella,J Haller,C Tully,Z Lesko,T Berger,U Sarica,V Kumar,M Perfilov,R Khurana,S Tekten,J Langford,A Albert,K Gill,C Hensel,M Johnson,I Dutta,S B Oh,E Focardi,P Lenzi,S Greene,M Chertok,S Sarkar,P Eerola,A Malakhov,O Prokofyev,P Bunin,M Meyer,C Heidecker,A Ioannou,J S Kim,K Uchida,M Arneodo,L Dudko,T Q Nguyen,S 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Chazin Quero,M Ramírez-García ,O Behnke,A Meyer,Federica Maria Simone ,Steffie Ann Thayil ,M L Vesterbacka Olsson,R Del Burgo,J A Murillo Quijada,A Vagnerini,V Brigljević ,T Novák ,J Kašpar ,N Vanegas Arbelaez,Yi Yang ,Mehmet Özgür Sahin ,R Žlebčík ,G Gomez Ceballos,Daniel Diaz

doi:10.1007/jhep11(2020)039

Abstract

Decays of the 125 GeV Higgs boson into a Z boson and a ρ0(770) or ϕ(1020) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at sqrt{s} = 13 TeV. The analysed data set corresponds to an integrated luminosity of 137 fb−1. Events are selected in which the Z boson decays into a pair of electrons or a pair of muons, and the ρ and ϕ mesons decay into pairs of pions and kaons, respectively. No significant excess above the background model is observed. As different polarization states are possible for the decay products of the Z boson and ρ or ϕ mesons, affecting the signal acceptance, scenarios in which the decays are longitudinally or transversely polarized are considered. Upper limits at the 95% confidence level on the Higgs boson branching fractions into Zρ and Zϕ are determined to be 1.04–1.31% and 0.31–0.40%, respectively, where the ranges reflect the considered polarization scenarios; these values are 740–940 and 730–950 times larger than the respective standard model expectations. These results constitute the first experimental limits on the two decay channels.

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