Measurement of the CP-violating weak phase phi(s) and the decay width difference Delta Gamma(s) using the B-s(0) -˃ J/psi phi (1020) decay channel in pp collisions at root s=8 TeV

Title
Measurement of the CP-violating weak phase phi(s) and the decay width difference Delta Gamma(s) using the B-s(0) -˃ J/psi phi (1020) decay channel in pp collisions at root s=8 TeV
Author
김태정
Keywords
CMS; Physics; B-physics; CP violation
Issue Date
2016-06
Publisher
ELSEVIER SCIENCE BV
Citation
PHYSICS LETTERS B, v. 757, Page. 97-120
Abstract
The CP-violating weak phase phi(s) of the B-s(0) meson and the decay width difference Delta Gamma(s) of the B-s(0) light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B-s(0)-˃ J/psi phi(1020) -˃ mu(+)mu-K+K- decays. The analysed data set corresponds to an integrated luminosity of 19.7 fb(-1) collected in pp collisions at a centre-of-mass energy of 8 TeV. A total of 49200 reconstructed B-s(0) decays are used to extract the values of phi(s) and Delta Gamma(s) by performing a time dependent and flavour-tagged angular analysis of the mu(+)mu-K+K- final state. The weak phase is measured to be phi(s) =-0.075 +/- 0.097 (stat) +/- 0.031 (syst) rad, and the decay width difference is Delta Gamma(s) = 0.095 +/- 0.013 (stat) +/- 0.007 (syst) ps(-1). (C) 2016 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).
URI
https://www.sciencedirect.com/science/article/pii/S037026931630017X?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/72430
ISSN
0370-2693; 1873-2445
DOI
10.1016/j.physletb.2016.03.046
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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