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Search for an Lμ − Lτ gauge boson using Z → 4μ events in proton-proton collisions at √s = 13 TeV
dc.contributor.author | Sirunyan, A.M. | |
dc.contributor.author | Sanders, Stephen J. | |
dc.contributor.author | The CMS Collaboration | |
dc.date.accessioned | 2021-01-25T20:31:04Z | |
dc.date.available | 2021-01-25T20:31:04Z | |
dc.date.issued | 2019-05-10 | |
dc.identifier.citation | A.M. Sirunyan et al., "Search for an Lμ − Lτ gauge boson using Z → 4μ events in proton-proton collisions at s=13 TeV, Physics Letters B, Volume 792, 2019, Pages 345-368, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2019.01.072. (http://www.sciencedirect.com/science/article/pii/S037026931930214X) | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/31236 | |
dc.description | This work is licensed under a Creative Commons Attribution 4.0 International License. | en_US |
dc.description.abstract | A search for a narrow Z gauge boson with a mass between 5 and 70 GeV resulting from an Lμ − Lτ 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 directdetection 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 protonproton 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 Lμ − Lτ 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. | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | © 2019 The Author(s). Published by Elsevier B.V. | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_US |
dc.subject | CMS | en_US |
dc.subject | Physics | en_US |
dc.subject | Zprime | en_US |
dc.subject | Muons | en_US |
dc.title | Search for an Lμ − Lτ gauge boson using Z → 4μ events in proton-proton collisions at √s = 13 TeV | en_US |
dc.type | Article | en_US |
kusw.kuauthor | Sanders, Stephen J. | |
kusw.kudepartment | Physics and Astronomy | en_US |
dc.identifier.doi | 10.1016/j.physletb.2019.01.072 | en_US |
kusw.oaversion | Scholarly/refereed, publisher version | en_US |
kusw.oapolicy | This item meets KU Open Access policy criteria. | en_US |
dc.rights.accessrights | openAccess | en_US |