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First observation of the decays B0(s)→D+sK−π+π− and B0s→Ds1(2536)+π−
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) First observation of the decays B0(s)→D+sK−π+π− and B0s→Ds1(2536)+π−. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 86 . Article number 112005 . doi:10.1103/PhysRevLett.108.161801 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.86.112005
Abstract
The first observation of the decays B0s→D+sK−π+π− and B0→D+sK−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 B0s→D+sπ−π+π− and B0s→D+sK−π+π−, respectively, are measured to be B(B0s→D+sK−π+π−)B(B0s→D+sπ−π+π−)=(5.2±0.5±0.3)×10−2 and B(B0→D+sK−π+π−)B(B0s→D+sK−π+π−)=0.54±0.07±0.07, where the first uncertainty is statistical and the second is systematic. The B0s→D+sK−π+π− decay is of particular interest as it can be used to measure the weak phase γ. First observation of the B0s→Ds1(2536)+π−, D+s1→D+sπ−π+ decay is also presented, and its branching fraction relative to B0s→D+sπ−π+π− is found to be B(B0s→Ds1(2536)+π−,D+s1→D+sπ−π+)B(B0s→D+sπ−π+π−)=(4.0±1.0±0.4)×10−3.
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