Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at SQUARE ROOTs=13 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10492806" target="_blank" >RIV/00216208:11320/23:10492806 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LUHTyk3-QV" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LUHTyk3-QV</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP05(2023)233" target="_blank" >10.1007/JHEP05(2023)233</a>
Alternative languages
Result language
angličtina
Original language name
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at SQUARE ROOTs=13 TeV
Original language description
Results are presented from a search for the Higgs boson decay H -> Z gamma, where Z -> l(+) l(-) with l = e or mu. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb(-1). Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength mu, defined as the product of the cross section and the branching fraction [ sigma(pp -> H) B (H -> Z gamma)] relative to the standard model prediction, is extracted from a simultaneous fit to the l(+) l(-) gamma invariant mass distributions in all categories and is measured to be mu = 2.4 +/- 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to sigma (pp -> H) B(H -> Z gamma) = 0.21 +/- 0.08 pb. The observed (expected) upper limit at 95% confidence level on mu is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions B(H -> Z gamma)/ B(H -> gamma gamma) is measured to be 1.5(-0.6)(+0.7), which agrees with the standard model prediction of 0.69 +/- 0.04 at the 1.5 standard deviation level.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics
ISSN
1029-8479
e-ISSN
1029-8479
Volume of the periodical
neuveden
Issue of the periodical within the volume
05
Country of publishing house
DE - GERMANY
Number of pages
49
Pages from-to
233
UT code for WoS article
001022881400001
EID of the result in the Scopus database
2-s2.0-85182816030