Publication: Search for an L μ − L τ gauge boson using Z → 4μ events in proton-proton collisions at s=13 TeV
Дата
2019
Авторы
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Ambrogi, F.
Chadeeva, M.
Parygin, P.
Philippov, D.
Polikarpov, S.
Popova, E.
Rusinov, V.
Journal Title
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Volume Title
Издатель
Аннотация
© 2019 The Author(s) A search for a narrow Z ′ gauge boson with a mass between 5 and 70 GeV resulting from an L μ −L τ U(1) local gauge symmetry is reported. Theories that predict such a particle have been proposed as an explanation of various experimental discrepancies, including the lack of a dark matter signal in direct-detection experiments, tension in the measurement of the anomalous magnetic moment of the muon, and reports of possible lepton flavor universality violation in B meson decays. A data sample of proton-proton collisions at a center-of-mass energy of 13 TeV is used, corresponding to an integrated luminosity of 77.3 fb −1 recorded in 2016 and 2017 by the CMS detector at the LHC. Events containing four muons with an invariant mass near the standard model Z boson mass are analyzed, and the selection is further optimized to be sensitive to the events that may contain Z→Z ′ μμ→4μ decays. The event yields are consistent with the standard model predictions. Upper limits of 10 −8 –10 −7 at 95% confidence level are set on the product of branching fractions B(Z→Z ′ μμ)B(Z ′ →μμ), depending on the Z ′ mass, which excludes a Z ′ boson coupling strength to muons above 0.004–0.3. These are the first dedicated limits on L μ −L τ models at the LHC and result in a significant increase in the excluded model parameter space. The results of this search may also be used to constrain the coupling strength of any light Z ′ gauge boson to muons.
Описание
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Цитирование
Search for an L μ − L τ gauge boson using Z → 4μ events in proton-proton collisions at s=13 TeV / Sirunyan, A.M. [et al.] // Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 2019. - 792. - P. 345-368. - 10.1016/j.physletb.2019.01.072
URI
https://www.doi.org/10.1016/j.physletb.2019.01.072
https://www.scopus.com/record/display.uri?eid=2-s2.0-85064326204&origin=resultslist
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https://openrepository.mephi.ru/handle/123456789/16873
https://www.scopus.com/record/display.uri?eid=2-s2.0-85064326204&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000466802100054
https://openrepository.mephi.ru/handle/123456789/16873