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dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbdallah, J
dc.contributor.authorAbdinov, O
dc.contributor.authorAben, R
dc.contributor.authorAbolins, M
dc.contributor.authorAbouZeid, OS
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAbreu, R
dc.contributor.authorAbulaiti, Y
dc.contributor.authorAcharya, BS
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdams, DL
dc.contributor.authorAdelman, J
dc.contributor.authorAdomeit, S
dc.contributor.authorAdye, T
dc.contributor.authorAffolder, AA
dc.contributor.authorAgatonovic-Jovin, T
dc.contributor.authorAgricola, J
dc.contributor.authorAguilar-Saavedra, JA
dc.contributor.authorAhlen, SP
dc.contributor.authorAhmadov, F
dc.contributor.authorAielli, G
dc.contributor.authorAkerstedt, H
dc.contributor.authorÅkesson, TPA
dc.contributor.authorAkimov, AV
dc.contributor.authorAlberghi, GL
dc.contributor.authorAlbert, J
dc.contributor.authorAlbrand, S
dc.contributor.authorAlconada Verzini, MJ
dc.contributor.authorAleksa, M
dc.contributor.authorAleksandrov, IN
dc.contributor.authorAlexa, C
dc.contributor.authorAlexander, G
dc.contributor.authorAlexopoulos, T
dc.contributor.authorAlhroob, M
dc.contributor.authorAlimonti, G
dc.contributor.authorAlio, L
dc.contributor.authorAlison, J
dc.contributor.authorAlkire, SP
dc.contributor.authorAllbrooke, BMM
dc.contributor.authorAllport, PP
dc.contributor.authorAloisio, A
dc.contributor.authorAlonso, A
dc.contributor.authorAlonso, F
dc.contributor.authorAlpigiani, C
dc.contributor.authorAltheimer, A
dc.contributor.authorAlvarez Gonzalez, B
dc.contributor.authorÁlvarez Piqueras, D
dc.contributor.authorAlviggi, MG
dc.contributor.authorAmadio, BT
dc.contributor.authorAmako, K
dc.contributor.authorAmaral Coutinho, Y
dc.contributor.authorAmelung, C
dc.contributor.authorAmidei, D
dc.contributor.authorAmor Dos Santos, SP
dc.contributor.authorAmorim, A
dc.contributor.authorAmoroso, S
dc.contributor.authorAmram, N
dc.contributor.authorAmundsen, G
dc.contributor.authorAnastopoulos, C
dc.contributor.authorAncu, LS
dc.contributor.authorAndari, N
dc.contributor.authorAndeen, T
dc.contributor.authorAnders, CF
dc.contributor.authorAnders, G
dc.contributor.authorAnders, JK
dc.contributor.authorAnderson, KJ
dc.contributor.authorAndreazza, A
dc.contributor.authorAndrei, V
dc.contributor.authorAngelidakis, S
dc.contributor.authorAngelozzi, I
dc.contributor.authorAnger, P
dc.contributor.authorAngerami, A
dc.contributor.authorAnghinolfi, F
dc.contributor.authorAnisenkov, AV
dc.contributor.authorAnjos, N
dc.contributor.authorAnnovi, A
dc.contributor.authorAntonelli, M
dc.description.abstractAn observation of the Λb0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb0→J/ψΛ0 decay has been made with the ATLAS detector in proton-proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb-1. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ0→ pπ- decay is exploited for the Λ0 baryon reconstruction. The Λb0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb0→ψ(2S)Λ0 and Λb0J/ψΛ0 decays is G{cyrillic}(Λb0→ψ(2S)Λ0/G{cyrillic}(Λb0J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.
dc.description.sponsorshipWe thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. 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, DNSRC and 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 and NSF, 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), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.en_US
dc.format.extent63 - 80
dc.rightsOpen Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics Under a Creative Commons license
dc.titleMeasurement of the branching ratio G{cyrillic}(Λ<inf>b</inf><sup>0</sup>→ψ(2S)Λ<sup>0</sup>)/G(Λ<inf>b</inf><sup>0</sup>→J/ψΛ<sup>0</sup>) with the ATLAS detector
dc.typeJournal Article
dc.relation.isPartOfPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.relation.isPartOfPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
pubs.organisational-group/Queen Mary University of London
pubs.organisational-group/Queen Mary University of London/Faculty of Science & Engineering
pubs.organisational-group/Queen Mary University of London/Faculty of Science & Engineering/Physics and Astronomy
pubs.organisational-group/Queen Mary University of London/Faculty of Science & Engineering/School of Physics

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