Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV
© 2019 CERN. Measurements of the top quark polarization and top quark pair (tt) spin correlations are presented using events containing two oppositely charged leptons (e+e-, e±μ or μ+μ-) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS expe...
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/136053 |
| _version_ | 1811080202548150272 |
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| author | The CMS Collaboration |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics The CMS Collaboration |
| author_sort | The CMS Collaboration |
| collection | MIT |
| description | © 2019 CERN. Measurements of the top quark polarization and top quark pair (tt) spin correlations are presented using events containing two oppositely charged leptons (e+e-, e±μ or μ+μ-) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.9 fb-1. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the tt production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromomagnetic and chromoelectric dipole moments of the top quark to -0.24<CtG/Λ2<0.07 TeV-2 and -0.33<CtGI/Λ2<0.20 TeV-2, respectively, at the 95% confidence level. |
| first_indexed | 2024-09-23T11:27:29Z |
| format | Article |
| id | mit-1721.1/136053 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:27:29Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1360532023-01-06T20:10:12Z Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV The CMS Collaboration Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science © 2019 CERN. Measurements of the top quark polarization and top quark pair (tt) spin correlations are presented using events containing two oppositely charged leptons (e+e-, e±μ or μ+μ-) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.9 fb-1. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the tt production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromomagnetic and chromoelectric dipole moments of the top quark to -0.24<CtG/Λ2<0.07 TeV-2 and -0.33<CtGI/Λ2<0.20 TeV-2, respectively, at the 95% confidence level. 2021-10-27T20:30:35Z 2021-10-27T20:30:35Z 2019 2021-06-25T13:53:58Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136053 en 10.1103/PHYSREVD.100.072002 Physical Review D Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Physical Society (APS) APS |
| spellingShingle | The CMS Collaboration Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title | Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title_full | Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title_fullStr | Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title_full_unstemmed | Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title_short | Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV |
| title_sort | measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton proton collisions at √ s 13 tev |
| url | https://hdl.handle.net/1721.1/136053 |
| work_keys_str_mv | AT thecmscollaboration measurementofthetopquarkpolarizationandttspincorrelationsusingdileptonfinalstatesinprotonprotoncollisionsats13tev |