Searches for lepton-flavour-violating decays of the Higgs boson into eτ and μτ in root s=13 TeV pp collisions with the ATLAS detector

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F23%3A00372976" target="_blank" >RIV/68407700:21220/23:00372976 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/23:00372976 RIV/68407700:21670/23:00372976

Result on the web

<a href="https://doi.org/10.1007/JHEP07(2023)166" target="_blank" >https://doi.org/10.1007/JHEP07(2023)166</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP07(2023)166" target="_blank" >10.1007/JHEP07(2023)166</a>

Result language

angličtina

Original language name

Searches for lepton-flavour-violating decays of the Higgs boson into eτ and μτ in root s=13 TeV pp collisions with the ATLAS detector

Original language description

This paper presents direct searches for lepton flavour violation in Higgs boson decays, H -> e tau and H -> mu tau, performed using data collected with the ATLAS detector at the LHC. The searches are based on a data sample of proton-proton collisions at a centre-of-mass energy root s = 13 TeV, corresponding to an integrated luminosity of 138 fb(-1). Leptonic (tau -> l nu(l)nu(tau)) and hadronic (tau -> hadrons nu(tau)) decays of the tau-lepton are considered. Two background estimation techniques are employed: the MC-template method, based on data-corrected simulation samples, and the Symmetry method, based on exploiting the symmetry between electrons and muons in the Standard Model backgrounds. No significant excess of events is observed and the results are interpreted as upper limits on lepton-flavour-violating branching ratios of the Higgs boson. The observed (expected) upper limits set on the branching ratios at 95% confidence level, B(H -> e tau) < 0.20% (0.12%) and B(H -> mu tau ) < 0.18% (0.09%), are obtained with the MC-template method from a simultaneous measurement of potential H -> e tau and H -> mu tau signals. The best-fit branching ratio difference, B(H -> mu tau) -> B(H -> e tau), measured with the Symmetry method in the channel where the tau-lepton decays to leptons, is (0.25 0.10)%, compatible with a value of zero within 2.5 sigma.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Center for advanced applied science</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Volume of the periodical

2023

Issue of the periodical within the volume

7

Country of publishing house

IT - ITALY

Number of pages

74

Pages from-to

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UT code for WoS article

001061947900001

EID of the result in the Scopus database

2-s2.0-85165876369