Abstract
In a data sample of approximately 1.3 fb;{-1} collected with the D0 detector between 2002 and 2006, the orbitally excited charm state D_{s1};{+/-}(2536) has been observed with a measured mass of 2535.7+/-0.6(stat)+/-0.5(syst) MeV/c;{2} via the decay mode B_{s};{0}-->D_{s1};{-}(2536)mu;{+}nu_{mu}X. A first measurement is made of the branching ratio product Br(b[over ]-->D_{s1};{-}(2536)mu;{+}nu_{mu}X)xBr(D_{s1};{-}-->D;{*-}K_{S};{0}). Assuming that D_{s1};{-}(2536) production in semileptonic decay is entirely from B_{s};{0}, an extraction of the semileptonic branching ratio Br(B_{s};{0}-->D_{s1};{-}(2536)mu;{+}nu_{mu}X) is made.
Highlights
16LAL, Univ Paris-Sud, IN2P3/CNRS, Orsay, France 17LPNHE, IN2P3/CNRS, Universites Paris VI and VII, Paris, France 18DAPNIA/Service de Physique des Particules, CEA, Saclay, France 19IPHC, Universite Louis Pasteur et Universitede Haute Alsace, CNRS/IN2P3, Strasbourg, France 20IPNL, Universite Lyon 1, CNRS/IN2P3, Villeurbanne, France and Universitede Lyon, Lyon, France
In a data sample of approximately 1:3 fbÀ1 collected with the D0 detector between 2002 and 2006, the orbitally excited charm state DÆs1ð2536Þ has been observed with a measured mass of 2535:7 Æ 0:6ðstatÞ Æ 0:5ðsystÞ MeV=c2 via the decay mode B0s ! DÀs1ð2536ÞþX
Semileptonic B0s decays into orbitally excited P-wave strange-charm mesons (DÃsÃ) are expected to make up a significant fraction of B0s semileptonic decays and are important when comparing inclusive and exclusive decay rates, extracting CKM matrix elements, and using semileptonic decays in B0s mixing analyses
Summary
1 2 states: DÃs0ð2317Þ and Ds1ð2460Þ [2], plus the observation of new DsJ states [3], deepens the need for a better understanding of these DÃsà systems since they may be quark molecular states, a new and very different arrangement of quarks. In this Letter we present the first measurement of semileptonic B0s decay into the narrow DÆs1ð2536Þ state. This state is just above the DÃKS0 mass threshold and has been observed previously [4]. Assuming that DÀs1ð2536Þ production in a semileptonic decay is entirely from B0s, the branching ratio BrðB0s ! DÃÀþXÞ 1⁄4 ð2:75 Æ 0:19Þ% [5] to avoid uncertainties in the b-quark production rate This semileptonic branching ratio includes any decay channel or sequence of channels resulting in a Dà and a lepton (muon in our case), and all b hadrons, and includes the relative production of each b hadron species starting from a b quark. To find the branching ratio, the following formula is used: fðb
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