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Title: Precise discussion of time-reversal asymmetries in B-meson decays

Abstract

BaBar collaboration announced that they observed time reversal (T) asymmetry through B meson system. In the experiment, time dependencies of two distinctive processes, B_ →B¯0 and B¯0 → B_ (– expresses CP value) are compared with each other. In our study, we examine event number difference of these two processes. In contrast to the BaBar asymmetry, the asymmetry of events number includes the overall normalization difference for rates. Time dependence of the asymmetry is more general and it includes terms absent in one used by BaBar collaboration. Both of the BaBar asymmetry and ours are naively thought to be T-odd since two processes compared are related with flipping time direction. We investigate the time reversal transformation property of our asymmetry. Using our notation, one can see that the asymmetry is not precisely a T-odd quantity, taking into account indirect CP and CPT violation of K meson systems. The effect of ϵK is extracted and gives rise to O(10–3) contribution. The introduced parameters are invariant under rephasing of quarks so that the coefficients of our asymmetry are expressed as phase convention independent quantities. Some combinations of the asymmetry enable us to extract parameters for wrong sign decays of Bd meson,more » CPT violation, etc. As a result, we also study the reason why the T-even terms are allowed to contribute to the asymmetry, and find that several conditions are needed for the asymmetry to be a T-odd quantity.« less

Authors:
 [1];  [1];  [1]
  1. Hiroshima Univ., Higashi-Hiroshima (Japan)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1178982
Report Number(s):
SLAC-PUB-16272
Journal ID: ISSN 1029-8479; arXiv:1411.2104
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 2; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; experiment-HEP; phenomenology-HEP; HEPPH; HEPEX

Citation Formats

Morozumi, Takuya, Okane, Hideaki, and Umeeda, Hiroyuki. Precise discussion of time-reversal asymmetries in B-meson decays. United States: N. p., 2015. Web. doi:10.1007/JHEP02(2015)174.
Morozumi, Takuya, Okane, Hideaki, & Umeeda, Hiroyuki. Precise discussion of time-reversal asymmetries in B-meson decays. United States. https://doi.org/10.1007/JHEP02(2015)174
Morozumi, Takuya, Okane, Hideaki, and Umeeda, Hiroyuki. 2015. "Precise discussion of time-reversal asymmetries in B-meson decays". United States. https://doi.org/10.1007/JHEP02(2015)174. https://www.osti.gov/servlets/purl/1178982.
@article{osti_1178982,
title = {Precise discussion of time-reversal asymmetries in B-meson decays},
author = {Morozumi, Takuya and Okane, Hideaki and Umeeda, Hiroyuki},
abstractNote = {BaBar collaboration announced that they observed time reversal (T) asymmetry through B meson system. In the experiment, time dependencies of two distinctive processes, B_ →B¯0 and B¯0 → B_ (– expresses CP value) are compared with each other. In our study, we examine event number difference of these two processes. In contrast to the BaBar asymmetry, the asymmetry of events number includes the overall normalization difference for rates. Time dependence of the asymmetry is more general and it includes terms absent in one used by BaBar collaboration. Both of the BaBar asymmetry and ours are naively thought to be T-odd since two processes compared are related with flipping time direction. We investigate the time reversal transformation property of our asymmetry. Using our notation, one can see that the asymmetry is not precisely a T-odd quantity, taking into account indirect CP and CPT violation of K meson systems. The effect of ϵK is extracted and gives rise to O(10–3) contribution. The introduced parameters are invariant under rephasing of quarks so that the coefficients of our asymmetry are expressed as phase convention independent quantities. Some combinations of the asymmetry enable us to extract parameters for wrong sign decays of Bd meson, CPT violation, etc. As a result, we also study the reason why the T-even terms are allowed to contribute to the asymmetry, and find that several conditions are needed for the asymmetry to be a T-odd quantity.},
doi = {10.1007/JHEP02(2015)174},
url = {https://www.osti.gov/biblio/1178982}, journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 2,
volume = 2015,
place = {United States},
year = {Thu Feb 26 00:00:00 EST 2015},
month = {Thu Feb 26 00:00:00 EST 2015}
}