2023 Impact factor 4.2
Particles and Fields

Eur. Phys. J. C 20, 431-443 (2001)
DOI: 10.1007/s100520100644

Investigation of inclusive CP asymmetries in $\rm B^0$ decays

The ALEPH Collaboration R. Barate and et al.

Laboratoire de Physique des Particules (LAPP), IN$^{2}$P$^{3}$-CNRS, 74019 Annecy-le-Vieux Cedex, France

(Received: 26 July 2000 / Published online: 8 June 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

A search for CP violating effects in the mixing of neutral B mesons is performed using a sample of 4.1 million hadronic Z decays collected with the ALEPH detector from 1991 to 1995. By studying time-dependent asymmetries in flavour-tagged samples of semileptonic and fully inclusive b-hadron decays, two measurements of the semileptonic asymmetry $a_{\rm CP}$ are extracted. No evidence for CP violation is observed, and the combined value $a_{\rm CP}= -0.013 \pm 0.026$ is obtained.

© Società Italiana di Fisica, Springer-Verlag 2001