Using events in which one of two neutral B mesons from the decay of an Y(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 B-0(B) over bar (0) mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations (Deltam,DeltaGamma/Gamma), CPT and CP violation (Re z,Im z), and CP and T violation (Im lambda(CP),\q/p\), where lambda(CP) characterizes B-0 and (B) over bar (0) decays to states of charmonium plus K-S(0) or K-L(0). The results are sgn(Re lambda(CP))DeltaGamma/Gamma=-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], (Re lambda(CP)/\lambda(CP)\)Re z=0.014+/-0.035(stat.)+/-0.034(syst.)[-0.072,0.101], Im z=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 Im lambda(CP) and Deltam are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.

Limits on the decay-rate difference of neutral B mesons and on CP, T, and CPT violation in B-0$$(B)over-bar(0) oscillations

ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;SARTI, Alessio;
2004

Abstract

Using events in which one of two neutral B mesons from the decay of an Y(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 B-0(B) over bar (0) mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations (Deltam,DeltaGamma/Gamma), CPT and CP violation (Re z,Im z), and CP and T violation (Im lambda(CP),\q/p\), where lambda(CP) characterizes B-0 and (B) over bar (0) decays to states of charmonium plus K-S(0) or K-L(0). The results are sgn(Re lambda(CP))DeltaGamma/Gamma=-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], (Re lambda(CP)/\lambda(CP)\)Re z=0.014+/-0.035(stat.)+/-0.034(syst.)[-0.072,0.101], Im z=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 Im lambda(CP) and Deltam are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.
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