Study of the Bc+ → J/ψ Ds+ and Bc+ → J/ψ Ds*+ decays with the ATLAS detector
Entity
UAM. Departamento de Física TeóricaPublisher
Springer New York LLCDate
2016-01-05Citation
10.1140/epjc/s10052-015-3743-8
European Physical Journal C 76.1 (2016): 1-24
ISSN
1434-6052 (online); 1434-6044 (print)DOI
10.1140/epjc/s10052-015-3743-8Funded by
We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS,MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRCand Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR;MSTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE andNSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFNCNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwideProject
info:eu-repo/grantAgreement/EC/FP7/246806Editor's Version
http://dx.doi.org/10.1140/epjc/s10052-015-3743-8Subjects
CERN; ATLAS detector; Decays; FísicaNote
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMRights
© CERN for the benefit of the ATLAS collaboration 2015Abstract
The decays Bc+ → J/ψ Ds+ and Bc+ → J/ψ Ds*+ are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb−1 of pp collisions collected at centre-of mass energies √s = 7 TeV and 8 TeV, respectively. Signal candidates are identified through J/ψ → μ+μ− and Ds (∗)+→ φπ+(γ /π0) decays. With a two-dimensional likelihood fit involving the Bc+ reconstructed invariant mass and an angle between the μ+ and Ds+ candidate momenta in the muon pair rest frame, the yields of Bc+ → J/ψ Ds+ and Bc+ → J/ψ Ds*+, and the transverse polarisation fraction in Bc+ → J/ψ Ds+ and Bc+ decay are measured. The transverse polarisation fraction is determined to be ɼ±± (Bc+ → J/ψ Ds*+)/ ɼ(Bc+ → J/ψ Ds*+) = 0.38 ± 0.23 ± 0.07, and the derived ratio of the branching fractions of the two modes is Ɓ Bc+ → J/ψ Ds*+ /ƁBc+ → J/ψ Ds+ = 〖2.8〗_(-0.8 )^(+1.2 ) ± 0.3, where the first error is statistical and the second is systematic. Finally, a sample of Bc+ → J/ψ π+ decays is used to derive the ratios of branching fractions Ɓ Bc+ → J/ψ Ds+ /ƁBc+ → J/ψ π+ = 3.8 ± 1.1 ± 0.4 ± 0.2 and Ɓ Bc+ → J/ψ Ds*+ /ƁBc+ → J/ψ π+ = 10.4 ± 3.1 ± 1.5 ± 0.6, where the third error corresponds to the uncertainty of the branching fraction of Ds+→ φ(K+K-)π+ decay. The available theoretical predictions are generally consistent with the measurement
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Google Scholar:Aad, G.
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ATLAS Collaboration
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Arnal, V.
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Barreiro Alonso, Fernando
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Cantero, J.
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De la Torre, H.
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Peso Malagón, José del
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Glasman Kuguel, Claudia Beatriz
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Llorente Merino, J.
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Terrón Cuadrado, Juan
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