Search for decays of the 125 GeV Higgs boson into a Z boson and a ρ or ϕ meson

被引：0
作者：
A. M. Sirunyan
A. Tumasyan
W. Adam
F. Ambrogi
T. Bergauer
M. Dragicevic
J. Erö
A. Escalante Del Valle
R. Frühwirth
M. Jeitler
N. Krammer
L. Lechner
D. Liko
T. Madlener
I. Mikulec
F. M. Pitters
N. Rad
J. Schieck
R. Schöfbeck
M. Spanring
S. Templ
W. Waltenberger
C.-E. Wulz
M. Zarucki
V. Chekhovsky
A. Litomin
V. Makarenko
J. Suarez Gonzalez
M. R. Darwish
E. A. De Wolf
D. Di Croce
X. Janssen
T. Kello
A. Lelek
M. Pieters
H. Rejeb Sfar
H. Van Haevermaet
P. Van Mechelen
S. Van Putte
N. Van Remortel
F. Blekman
E. S. Bols
S. S. Chhibra
J. D’Hondt
J. De Clercq
D. Lontkovskyi
S. Lowette
I. Marchesini
S. Moortgat
A. Morton
机构：
[1] Yerevan Physics Institute,Institute for Nuclear Research and Nuclear Energy
[2] Institut für Hochenergiephysik,Department of Physics
[3] Institute for Nuclear Problems,State Key Laboratory of Nuclear Physics and Technology
[4] Universiteit Antwerpen,Center for High Energy Physics (CHEP
[5] Vrije Universiteit Brussel,FU)
[6] Université Libre de Bruxelles,Department of Physics
[7] Ghent University,Institute of Physics
[8] Université Catholique de Louvain,Department of Physics
[9] Centro Brasileiro de Pesquisas Fisicas,National Centre for Particle Physics
[10] Universidade do Estado do Rio de Janeiro,National Centre for Physics
[11] Universidade Estadual Paulista,Institute of Experimental Physics, Faculty of Physics
[12] Universidade Federal do ABC,Skobeltsyn Institute of Nuclear Physics
[13] Bulgarian Academy of Sciences,Department of Basic and Applied Sciences, Faculty of Engineering
[14] University of Sofia,Physics Department, Faculty of Science
[15] Beihang University,Department of Physics
[16] Tsinghua University,Faculty of Physics
[17] Institute of High Energy Physics,School of Physics and Astronomy
[18] Peking University,undefined
[19] Sun Yat-Sen University,undefined
[20] Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion- beam Application (MOE) — Fudan University,undefined
[21] Zhejiang University,undefined
[22] Universidad de Los Andes,undefined
[23] Universidad de Antioquia,undefined
[24] University of Split,undefined
[25] Faculty of Electrical Engineering,undefined
[26] Mechanical Engineering and Naval Architecture,undefined
[27] University of Split,undefined
[28] Faculty of Science,undefined
[29] Institute Rudjer Boskovic,undefined
[30] University of Cyprus,undefined
[31] Charles University,undefined
[32] Escuela Politecnica Nacional,undefined
[33] Universidad San Francisco de Quito,undefined
[34] Academy of Scientific Research and Technology of the Arab Republic of Egypt,undefined
[35] Egyptian Network of High Energy Physics,undefined
[36] Fayoum University,undefined
[37] National Institute of Chemical Physics and Biophysics,undefined
[38] University of Helsinki,undefined
[39] Helsinki Institute of Physics,undefined
[40] Lappeenranta University of Technology,undefined
[41] IRFU,undefined
[42] CEA,undefined
[43] Université Paris-Saclay,undefined
[44] Laboratoire Leprince-Ringuet,undefined
[45] CNRS/IN2P3,undefined
[46] Ecole Polytechnique,undefined
[47] Institut Polytechnique de Paris,undefined
[48] Université de Strasbourg,undefined
[49] CNRS,undefined
[50] IPHC UMR 7178,undefined
来源：
Journal of High Energy Physics | / 2020卷
关键词：
Hadron-Hadron scattering (experiments); Higgs physics; Particle and resonance production;
D O I：
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摘要：
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 s\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s} $$\end{document} = 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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