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First observation of Bs -> D_{s2}^{*+} X mu nu decays

Abstract : Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are detected. Two structures are observed in the D0 K+ mass spectrum at masses consistent with the known D^+_{s1}(2536) and $D^{*+}_{s2}(2573) mesons. The measured branching fractions relative to the total Bs semileptonic rate are B(Bs -> D_{s2}^{*+} X mu nu)/B(Bs -> X mu nu)= (3.3\pm 1.0\pm 0.4)%, and B(Bs -> D_{s1}^+ X munu)/B(Bs -> X mu nu)= (5.4\pm 1.2\pm 0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D_{s2}^{*+} state in Bs decays; we also measure its mass and width.
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Contributor : Danielle Cristofol <>
Submitted on : Friday, February 4, 2011 - 3:25:05 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:03 PM

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R. Aaij, C. Adrover, F. Alesio, E. Aslanides, J. Cogan, et al.. First observation of Bs -> D_{s2}^{*+} X mu nu decays. Physics Letters B, Elsevier, 2011, 698, pp.14-20. ⟨10.1016/j.physletb.2011.02.039⟩. ⟨in2p3-00563271⟩



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