期刊
PHYSICS LETTERS B
卷 698, 期 1, 页码 14-20出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.02.039
关键词
LHC; Semileptonic b decays; (B)over-bar(s)(0) meson
资金
- CAPES (Brazil)
- CNPq (Brazil)
- FAPERJ (Brazil)
- FINEP (Brazil)
- CERN
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- HGF (Germany)
- MPG (Germany)
- SFI (Ireland)
- INFN (Italy)
- FOM (Netherlands)
- NWO (Netherlands)
- SCSR (Poland)
- ANCS (Romania)
- MinES of Russia and Rosatom (Russia)
- MICINN (Spain)
- XUNGAL (Spain)
- GENCAT (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NAS Ukraine (Ukraine)
- STFC (United Kingdom)
- NSF (USA)
- STFC [ST/H001093/1, ST/H001166/1, ST/H001026/1, ST/H006737/1, ST/I002839/1, ST/F007094/1, ST/G502412/1, PP/E002722/1, LHCb Upgrades, ST/I505572/1, LHCb, ST/H001077/1, ST/H001093/2, ST/K004646/1, ST/K00073X/1, ST/H001026/2, ST/G005974/1, PP/E000347/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H001093/1, ST/H001166/1, PP/E002722/1, ST/I505572/1, ST/G005974/1, ST/H001026/2, ST/H001026/1, ST/I002839/1, ST/H001093/2, ST/F007094/1, ST/G502412/1, LHCb, ST/H001077/1, ST/K00073X/1, ST/H006737/1, PP/E000347/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [0852713] Funding Source: National Science Foundation
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays (B) over bar (0)(s) -> D+X mu(-)(nu) over bar and (B) over bar (0)(s) -> (DK+X)-K-0 mu(-)(nu) over bar are detected. Two structures are observed in the (DK+)-K-0 mass spectrum at masses consistent with the known D-s1(2536)(+) and D-s2*(2573)(+) mesons. The measured branching fractions relative to the total (B) over bar (0)(s) semileptonic rate are B((B) over bar (0)(s) -> (Ds2X)-X-*mu(-)(nu) over bar /B(B-2(-0) -> X mu(-)(nu) over bar) = (3.3 +/- 1.0 +/- 0.4)%, and B((B) over bar (0)(s) -> (Ds2X)-X-*mu(-)(nu) over bar /B(B-2(-0) -> X mu(-)(nu) over bar) = (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 B-s2*(+) decays; we also measure its mass and width. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
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