Limits on the decay-rate difference of neutral B mesons and on CP, T, and CPT violation in B0B0 oscillations

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 70, 012007 – Published 27 July 2004
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Abstract

Using events in which one of two neutral B mesons from the decay of an Υ(4S) resonance is fully reconstructed, we set limits on the difference between the decay rates of the two neutral B mass eigenstates and on CP, T, and CPT violation in B0B0 mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million Υ(4S)BB¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations (Δm,ΔΓ/Γ), CPT and CP violation (Rez,Imz), and CP and T violation (ImλCP,|q/p|), where λCP characterizes B0 and B0 decays to states of charmonium plus KS0 or KL0. The results are sgn(ReλCP)ΔΓ/Γ=0.008±0.037(stat.)±0.018(syst.)[0.084,0.068],|q/p|=1.029±0.013(stat.)±0.011(syst.)[1.001,1.057],(ReλCP/|λCP|)Rez=0.014±0.035(stat.)±0.034(syst.)[0.072,0.101],Imz=0.038±0.029(stat.)±0.025(syst.)[0.028,0.104].The values inside square brackets indicate the 90% confidence-level intervals. The values of ImλCP and Δm are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.

  • Received 29 February 2004

DOI:https://doi.org/10.1103/PhysRevD.70.012007

©2004 American Physical Society

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Vol. 70, Iss. 1 — 1 July 2004

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