Springer LINK: The European Physical Journal C - Abstract Volume 5 Issue 3 (1998) pp 379-388

The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 5 Issue 3 (1998) pp 379-388
DOI 10.1007/s100529800949

experimental physics:
Investigation of CP violation in $\mathrm{B^0} \rightarrow \mathrm{J}/\psi \mathrm{K^0_S}$decays at LEP

The OPAL Collaboration , K. Ackerstaff et al. (8)

(8) CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland

Received: 19 March 1998 / Published online: 12 August 1998

Abstract. An investigation of CP violation was performed using a total of 24 candidates for $\mathrm{B^0} \rightarrow \mathrm{J}/\psi \mathrm{K^0_S}$decay, with a purity of about 60%. These events were selected from 4.4 million hadronic $\rm Z^0$decays recorded by the OPAL detector at LEP. An analysis procedure, involving techniques to reconstruct the proper decay times and tag the produced b-flavours, $\mathrm{B^0}$or $\bar{\rm B}^0$, has been developed to allow a first direct study of the time dependent CP asymmetry that, in the Standard Model, is $\sin 2\beta$. The result is \[ \sin 2\beta = 3.2 _{-2.0}^{+1.8} \pm 0.5 \;, \] where the first error is statistical and the second systematic. This result is used to determine probabilities for different values of $\sin 2\beta$in the physical region from $-1$to +1.

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The European Physical Journal C

experimental physics: Investigation of CP violation in $\mathrm{B^0} \rightarrow \mathrm{J}/\psi \mathrm{K^0_S}$decays at LEP

experimental physics:
Investigation of CP violation in $\mathrm{B^0} \rightarrow \mathrm{J}/\psi \mathrm{K^0_S}$decays at LEP