Eur Phys J C (2004) 33: s349-s351
https://doi.org/10.1140/epjcd/s2003-03-0307-x

PS03 CP Violation

Towards CP-violation results from DØ

NIKHEF, Dutch Institute for Nuclear and High-Energy Physics, P.O. Box 41882, 1009DB Amsterdam, The Netherlands

Received: 1 October 2003
Accepted: 15 October 2003
Published online: 22 October 2003

Abstract

We have made a preliminary study of a dimuon sample corresponding to 114 pb^–1 of data taken in Run II at the Tevatron. From this sample we have selected 157 ± 20   B _d → J/ψ K _S ⁰ and 133 ± 17   B _s → J/ψ φ decays. In a subset of the data we have measured the B ^± lifetime in the J/ψ K ^± channel to be . We have implemented a jet-charge initial-flavor tag as well as a soft-muon tag, and we have measured the respective tagging powers to be (2.4 ± 1.7)% and (3.3 ± 1.8)%. Our conclusion from these studies is that we have made good progress towards understanding all ingredients required to make CP violation measurements in the B _d and B _s systems.