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Title: Recent Results on T and CP Violation at BABAR

Abstract

CP-violation (CPV) and Time-reversal violation (TRV) are intimately related through the CPT theorem: if one of these discrete symmetries is violated the other one has to be violated in such a way to conserve CPT. Although CPV in the B 0B 0-bar system has been established by the B-factories, implying indirectly TRV, there is still no direct evidence of TRV. We report on the observation of TRV in the B-meson system performed with a dataset of 468 × 10 6 BB-bar pairs produced in Υ(4S) decays collected by the BABAR detector at the PEP-II asymmetric-energy e +e - collider at the SLAC National Accelerator Laboratory. We also report on other CPV measurements recently performed on the B-meson system

Authors:
 [1]
  1. Istituto Nazionale di Fisica Nucleare (INFN), Pisa (Italy).
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:
1169461
Report Number(s):
SLAC-PUB-16224
arXiv:1307.2759; TRN: US1600046
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: XXI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2013), Marseilles (France), 22-26 Apr 2013
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; T INVARIANCE; CP INVARIANCE; B NEUTRAL MESONS; ANTI-B NEUTRAL MESONS; CPT THEOREM; DECAY; UPSILON-9460 MESONS; Experiment-HEP, Phenomenology-HEP,HEPPH, HEPEX

Citation Formats

Perez Perez, Alejandro. Recent Results on T and CP Violation at BABAR. United States: N. p., 2015. Web.
Perez Perez, Alejandro. Recent Results on T and CP Violation at BABAR. United States.
Perez Perez, Alejandro. Fri . "Recent Results on T and CP Violation at BABAR". United States. doi:. https://www.osti.gov/servlets/purl/1169461.
@article{osti_1169461,
title = {Recent Results on T and CP Violation at BABAR},
author = {Perez Perez, Alejandro},
abstractNote = {CP-violation (CPV) and Time-reversal violation (TRV) are intimately related through the CPT theorem: if one of these discrete symmetries is violated the other one has to be violated in such a way to conserve CPT. Although CPV in the B0B0-bar system has been established by the B-factories, implying indirectly TRV, there is still no direct evidence of TRV. We report on the observation of TRV in the B-meson system performed with a dataset of 468 × 106 BB-bar pairs produced in Υ(4S) decays collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We also report on other CPV measurements recently performed on the B-meson system},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Feb 06 00:00:00 EST 2015},
month = {Fri Feb 06 00:00:00 EST 2015}
}

Conference:
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  • The BABAR experiment at the PEP-II B factory at SLAC has collected over 37 10{sup 6} BB pairs in the years 2000 and 2001. Based on this data sample, various studies of CP violation in the B system are presented, including the first observation of CP violation outside the kaon system and a measurement of the CKM parameter sin(2{beta}) = 0.59 {+-} 0.14(stat) {+-} 0.05(syst). Studies on direct CP violation and CP violation in mixing are also presented.
  • We review recent time-dependent measurements in the B meson sector based on data collected between 1999 and 2002 by the BABAR detector, which correspond to approximately 88 millions B-Bbar pairs. These results were presented at the Rencontres de Moriond, Electroweak Interactions and Unified Theories in March 2003.
  • Measurements of the CKM parameter sin(2{beta}) have established CP violation in the B{sup 0} meson system arising from the interference between mixing and decay. However, direct CP violation, arising from the interference among different terms in the decay amplitude, had not been observed so far. We report a first observation of direct CP violation in B{sup 0} {yields} K{sup +}{pi}{sup -} decays with the BaBar detector. Other selected results based on the search for direct CP violation in several other B decays are also presented.