First observation of Bs0 → D*s2+Xμ-ν decays
Dossett, D., Gershon, T. J., Harrison, P. F., Latham, Thomas, Poluektov, Anton, Whitehead, M. (Mark) and Williams, M. P. (2011) First observation of Bs0 → D*s2+Xμ-ν decays. Physics Letters B, Volume 698 (Number 1). pp. 14-20. ISSN 0370-2693
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Official URL: http://dx.doi.org/10.1016/j.physletb.2011.02.039
Using data collected with the LHCb detector in proton–proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0s→D+sXμ−ν and B0s→D0K+Xμ−ν are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ and D∗s22573)+ mesons. The measured branching fractions relative to the total B0s semileptonic rate are B(B0s→D∗+s2Xμ−ν)/B(B0s→Xμ−ν) = (3.3±1.0±0.4)%, and B(B0s→D+s1Xμ−ν)/B(B0s→Xμ−ν) = (5.4±1.2±0.5)%, where the ﬁrst uncertainty is statistical and the second is systematic. This is the ﬁrst observation of the D∗+s2 state in B0s decays; we also measure its mass and width.
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