Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
© 2020, The Author(s). The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to...
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| Language: | English |
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Springer Science and Business Media LLC
2021
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| Online Access: | https://hdl.handle.net/1721.1/137212 |
| _version_ | 1826204098339274752 |
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| author | The LHCb Collaboration Boettcher, Thomas Julian Craik, Daniel C Weisser, Constantin Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics The LHCb Collaboration Boettcher, Thomas Julian Craik, Daniel C Weisser, Constantin Williams, Michael |
| author_sort | The LHCb Collaboration |
| collection | MIT |
| description | © 2020, The Author(s). The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. [Figure not available: see fulltext.] |
| first_indexed | 2024-09-23T12:48:52Z |
| format | Article |
| id | mit-1721.1/137212 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:48:52Z |
| publishDate | 2021 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1372122023-01-06T21:15:03Z Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV The LHCb Collaboration Boettcher, Thomas Julian Craik, Daniel C Weisser, Constantin Williams, Michael Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science © 2020, The Author(s). The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. [Figure not available: see fulltext.] 2021-11-03T14:54:42Z 2021-11-03T14:54:42Z 2020 2021-04-29T16:47:06Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/137212 2020. "Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV." Journal of High Energy Physics, 2020 (8). en 10.1007/JHEP08(2020)051 Journal of High Energy Physics Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Springer |
| spellingShingle | The LHCb Collaboration Boettcher, Thomas Julian Craik, Daniel C Weisser, Constantin Williams, Michael Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title_full | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title_fullStr | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title_full_unstemmed | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title_short | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
| title_sort | combination of the w boson polarization measurements in top quark decays using atlas and cms data at √s 8 tev |
| url | https://hdl.handle.net/1721.1/137212 |
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