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Title: | First observation of Bs→Ds2∗+Xμν decays |
Author: | Ruiz, Hugo (Ruiz Pérez) Graciani Díaz, Ricardo Garrido Beltrán, Lluís Graugés Pous, Eugeni LHCb Collaboration |
Keywords: | Física de partícules Experiments Gran Col·lisionador d'Hadrons Mesons (Física nuclear) Particle physics Experiments Large Hadron Collider (France and Switzerland) Mesons (Nuclear physics) |
Issue Date: | 2011 |
Publisher: | Elsevier B.V. |
Abstract: | Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0 s → D+ s Xμ−ν and B0 s → D0 K + Xμ−ν are detected. Two struc- tures 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 B0 s semileptonic rate are B(B0 s → D∗+ s2 Xμ−ν)/B(B0 s → Xμ−ν) = (3.3 ± 1.0 ± 0.4)%, and B(B0 s → D+ s1 Xμ−ν)/B(B0 s → 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 B0 s decays; we also measure its mass and width |
Note: | Reproducció del document publicat a: https://doi.org/10.1016/j.physletb.2011.02.039 |
It is part of: | Physics Letters B, 2011, vol. 698, num. 1, p. 14-20 |
URI: | http://hdl.handle.net/2445/195591 |
Related resource: | https://doi.org/10.1016/j.physletb.2011.02.039 |
ISSN: | 0370-2693 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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