Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2014)103
Keywords
B physics; CP violation; Branching fraction; Flavor physics; Hadron-Hadron Scattering
Categories
Funding
- CERN
- CAPES (Brazil)
- CNPq (Brazil)
- FAPERJ (Brazil)
- FINEP (Brazil)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- HGF (Germany)
- MPG (Germany)
- SFI (Ireland)
- INFN (Italy)
- FOM (The Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MinES (Russia)
- FANO (Russia)
- MinECo (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NASU (Ukraine)
- STFC (United Kingdom)
- NSF (USA)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205805] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/L006146/1, ST/K502236/1, ST/K000705/1, ST/H006737/1, ST/K001310/1 LHCb Upgrades, 1369397, 1364044, ST/K001604/1 DMUK, ST/K003410/1, ST/I000097/1, ST/K001604/1 LHCb Upgrades, ST/K001604/1 GRIDPP, ST/H00100X/2, ST/L001144/1, 1225304, ST/K003534/1, ST/K001604/1 MICE/UKNF, ST/K001310/1, ST/J004332/1, GRIDPP, ST/K00073X/1, ST/L003392/1, ST/K001310/1 ATLAS Upgrades, ST/K00140X/1 LHCb, ST/K001361/1 ATLAS Upgrades, ST/K003534/1 GRIDPP, 1208164, LHCb, PP/E003095/1, PP/E000355/1, ST/H00100X/1, ST/I003576/1, ST/K001361/1 LHCb, ST/K001310/1 LHCb, ST/K00140X/1, ST/F007094/1, ST/K001604/1, ST/J005495/1, ST/K001418/1, ST/H001093/2, ST/K001361/1 LHCb Upgrades, PP/E000347/1, ST/J004855/1, ST/L001195/1, ST/K001604/1 LHCb, ST/K001361/1 ATLAS, ST/K001604/1 SuperNEMO, ST/M000761/1, ST/K001256/1, 1299204, ST/K001604/1 CMS Upgrade, 1415632, ST/K001302/1, ST/K001361/1, 1225314, ST/H001093/1, ST/L00352X/1, LHCb Upgrades, 1096173, ST/M001474/1, ST/I505572/1, ST/L003538/1, ST/G005974/1, ST/H001026/2, 1416165, ST/K001310/1 ATLAS, ST/K001361/1 MINOS/MINOS+, ST/H001069/2, ST/H001026/1, ST/M001431/1, ST/K003593/1 GRIDPP, ST/K00137X/1, ST/L006340/1, ST/K001604/1 T2K, ST/L003112/1] Funding Source: researchfish
- STFC [ST/L003392/1, ST/H00100X/1, ST/L001144/1, ST/H00100X/2, PP/E000347/1, ST/K001604/1, ST/G005974/1, ST/H001026/2, ST/K00137X/1, ST/K00073X/1, ST/K003410/1, ST/H001093/2, ST/M001431/1, ST/K502236/1, ST/J004332/1, LHCb, ST/I505572/1, LHCb Upgrades, ST/L003112/1, ST/L006340/1, ST/K001361/1, ST/I000097/1, ST/F007094/1, ST/H001069/2, ST/M000761/1, ST/L006146/1, ST/L00352X/1, ST/K003534/1, ST/K001302/1, PP/E003095/1, ST/J005495/1, ST/K00140X/1, PP/E000355/1, ST/J004855/1, ST/I003576/1, ST/L001195/1, ST/H001093/1, ST/H001026/1, ST/H006737/1, ST/K000705/1, ST/L003538/1] Funding Source: UKRI
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The first observation of the Cabibbo-suppressed decay Lambda(0)(b) -> J / psi p pi(-) is reported using a data sample of proton-proton collisions at 7 and 8TeV, corresponding to an integrated luminosity of 3 fb(-1). A prominent signal is observed and the branching fraction relative to the decay mode Lambda(0)(b) -> J / psi pK(-) is determined to be B(Lambda(0)(b) -> J / psi p pi(-))/ B(Lambda(0)(b) -> J / psi pK(-)) = 0.0824 +/- 0.0025 (stat) +/- 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be ACP(Lambda(0)(b) -> J / psi p pi(-))/ A(CP)(Lambda(0)(b) -> J / psi pK(-)) = (+5.7 +/- 2.4 (stat) +/- 1.2 (syst))%, which is compatible with CP symmetry at the 2.2 sigma level.
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