|
Title
|
|
|
|
Measurement of the CP-violating phase phi s in the B0s at root s=13 TeV s -> J/psi phi(1020) -> & micro; plus & micro;& minus; K plus K & minus; channel in proton-proton collisions at & nbsp;root s=13 TeV
| |
|
Author
|
|
|
|
| |
|
Institution/Organisation
|
|
|
|
CMS Collaboration
| |
|
Abstract
|
|
|
|
| The CP-violating weak phase ?s and the decay width difference ??s between the light and heavy B0s mass eigenstates are measured with the CMS detector at the LHC in a sample of 48 500 reconstructed B0s? J/I) d (1020) ?11+11? K+K? events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb?1, collected in proton-proton collisions at ?s = 13 TeV in 2017?2018. To extract the values of ?s and ??s, a time-dependent and flavor-tagged angular analysis of the 11+11?K+K? final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ?s = ?11 ?50 (stat) ? 10 (syst) mrad and ??s = 0.114 ? 0.014 (stat)? 0.007 (syst) ps?1, in agreement with the standard model predictions. When combined with the previous CMS measurement at ?s = 8 TeV, the following values are obtained: ?s = ?21 ? 44 (stat) ? 10 (syst) mrad, ??s = 0.1032 ? 0.0095 (stat) ? 0.0048 (syst) ps?1, a significant improvement over the 8 TeV result. ? 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Physics letters : B. - Amsterdam, 1967, currens
| |
|
Publication
|
|
|
|
Amsterdam
:
North-Holland
,
2021
| |
|
ISSN
|
|
|
|
0370-2693
| |
|
DOI
|
|
|
|
10.1016/J.PHYSLETB.2021.136188
| |
|
Volume/pages
|
|
|
|
816
(2021)
, 27 p.
| |
|
Article Reference
|
|
|
|
136188
| |
|
ISI
|
|
|
|
000647421500001
| |
|
Medium
|
|
|
|
E-only publicatie
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|
Full text (open access)
|
|
|
|
| |
|