Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV
© 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 dar...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier BV
2020
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| Online Access: | https://hdl.handle.net/1721.1/126754 |
| _version_ | 1826188991510085632 |
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| author | CMS Collaboration Abercrombie, Daniel Robert Allen, B. Azzolini, Virginia Barbieri, Richard Alexander Baty, Austin Alan Bauer, Gerry P Bi, R. Brandt, S. Busza, Wit Cali, Ivan Amos D'Alfonso, Mariarosaria Demiragli, Zeynep Gomez-Ceballos, Guillelmo Goncharov, Maxim Harris, Philip Coleman Hsu, D. Hu, M. Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Lee, Y. -J. Levin, A. Luckey Jr, P David Maier, Benedikt Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, S. Niu, Xinmei Paus, Christoph M. E. Roland, Christof Roland, G. Stephans, George S. F. Sumorok, Konstanty C Tatar, K. Velicanu, Dragos Alexandru Wang, J Wang, T.W. Wyslouch, Boleslaw Shi, Zhaozhong |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics CMS Collaboration Abercrombie, Daniel Robert Allen, B. Azzolini, Virginia Barbieri, Richard Alexander Baty, Austin Alan Bauer, Gerry P Bi, R. Brandt, S. Busza, Wit Cali, Ivan Amos D'Alfonso, Mariarosaria Demiragli, Zeynep Gomez-Ceballos, Guillelmo Goncharov, Maxim Harris, Philip Coleman Hsu, D. Hu, M. Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Lee, Y. -J. Levin, A. Luckey Jr, P David Maier, Benedikt Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, S. Niu, Xinmei Paus, Christoph M. E. Roland, Christof Roland, G. Stephans, George S. F. Sumorok, Konstanty C Tatar, K. Velicanu, Dragos Alexandru Wang, J Wang, T.W. Wyslouch, Boleslaw Shi, Zhaozhong |
| author_sort | CMS Collaboration |
| collection | MIT |
| description | © 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. |
| first_indexed | 2024-09-23T08:08:08Z |
| format | Article |
| id | mit-1721.1/126754 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:08:08Z |
| publishDate | 2020 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1267542020-08-25T03:44:00Z Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV CMS Collaboration Abercrombie, Daniel Robert Allen, B. Azzolini, Virginia Barbieri, Richard Alexander Baty, Austin Alan Bauer, Gerry P Bi, R. Brandt, S. Busza, Wit Cali, Ivan Amos D'Alfonso, Mariarosaria Demiragli, Zeynep Gomez-Ceballos, Guillelmo Goncharov, Maxim Harris, Philip Coleman Hsu, D. Hu, M. Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Lee, Y. -J. Levin, A. Luckey Jr, P David Maier, Benedikt Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, S. Niu, Xinmei Paus, Christoph M. E. Roland, Christof Roland, G. Stephans, George S. F. Sumorok, Konstanty C Tatar, K. Velicanu, Dragos Alexandru Wang, J Wang, T.W. Wyslouch, Boleslaw Shi, Zhaozhong Massachusetts Institute of Technology. Department of Physics © 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. 2020-08-24T16:57:17Z 2020-08-24T16:57:17Z 2020-03-03T19:21:56Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/126754 "Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV." en 10.1016/J.PHYSLETB.2019.01.072 Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Elsevier BV Elsevier |
| spellingShingle | CMS Collaboration Abercrombie, Daniel Robert Allen, B. Azzolini, Virginia Barbieri, Richard Alexander Baty, Austin Alan Bauer, Gerry P Bi, R. Brandt, S. Busza, Wit Cali, Ivan Amos D'Alfonso, Mariarosaria Demiragli, Zeynep Gomez-Ceballos, Guillelmo Goncharov, Maxim Harris, Philip Coleman Hsu, D. Hu, M. Iiyama, Yutaro Innocenti, Gian Michele Klute, Markus Kovalskyi, Dmytro Lee, Y. -J. Levin, A. Luckey Jr, P David Maier, Benedikt Marini, Andrea Carlo McGinn, Christopher Francis Mironov, Camelia Maria Narayanan, S. Niu, Xinmei Paus, Christoph M. E. Roland, Christof Roland, G. Stephans, George S. F. Sumorok, Konstanty C Tatar, K. Velicanu, Dragos Alexandru Wang, J Wang, T.W. Wyslouch, Boleslaw Shi, Zhaozhong Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title | Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title_full | Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title_fullStr | Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title_full_unstemmed | Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title_short | Search for an L − L gauge boson using Z → 4μ events in proton-proton collisions at √ s = 13 TeV |
| title_sort | search for an l l gauge boson using z 4μ events in proton proton collisions at √ s 13 tev |
| url | https://hdl.handle.net/1721.1/126754 |
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