The first observation of the decays B̄s0→Ds+K -π +π - and B ̄0→ Ds+K -π +π - are reported using an integrated luminosity of 1.0 fb -1 recorded by the LHCb experiment. The branching fractions, normalized with respect to B̄s0→Ds+π -π +π - and B̄s0→Ds+K -π +π -, respectively, are measured to be B(B̄s0→Ds+K -π +π -) B(B̄s0→Ds+π -π +π -)=(5. 2±0.5±0.3)×10 -2 and B(B ̄0→ Ds+K -π +π -)B(B̄s0→Ds+K -π +π -)=0.54±0.07±0.07, where the first uncertainty is statistical and the second is systematic. The B̄s0→Ds+K -π +π - decay is of particular interest as it can be used to measure the weak phase γ. First observation of the B̄s0→D s1(2536) +π -, Ds1+→Ds+π -π + decay is also presented, and its branching fraction relative to B̄s0→Ds+π -π +π - is found to be B(B̄s0→ D s1(2536) +π -,Ds1+→Ds+π -π +)B(B̄s0→Ds+π -π +π -)=(4.0±1.0±0.4) ×10 -3.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 20 Dec 2012|
Copyright 2013 Elsevier B.V., All rights reserved.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)