ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of the branching ratio Γ(Λ 0 b →ψ(2S)Λ 0 )/Γ(Λ 0 b →J/ψΛ 0 ) with the ATLAS detector. Physics letters. B, 751, pp. 63-80. Elsevier 10.1016/j.physletb.2015.10.009
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An observation of the Λ 0 b →ψ(2S)Λ 0 decay and a comparison of its branching fraction with that of the Λ 0 b →J/ψΛ 0 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 Λ 0 →pπ − decay is exploited for the Λ 0 baryon reconstruction. The Λ 0 b baryons are reconstructed with transverse momentum p T >10 GeV and pseudorapidity |η|<2.1 . The measured branching ratio of the Λ 0 b →ψ(2S)Λ 0 and Λ 0 b →J/ψΛ 0 decays is Γ(Λ 0 b →ψ(2S)Λ 0 )/Γ(Λ 0 b →J/ψΛ 0 )=0.501±0.033(stat)±0.019(syst) , lower than the expectation from the covariant quark model.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) 08 Faculty of Science > Physics Institute |
UniBE Contributor: |
Beck, Hans Peter, Cervelli, Alberto, Ereditato, Antonio, Haug, Sigve, Meloni, Federico, Mullier, Geoffrey André Adrien, Pretzl, Klaus-Peter, Stramaglia, Maria Elena, Stucci, Stefania, Weber, Michele |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0370-2693 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Annette Krebs-Wegenast |
Date Deposited: |
08 Sep 2016 11:14 |
Last Modified: |
05 Dec 2022 14:58 |
Publisher DOI: |
10.1016/j.physletb.2015.10.009 |
ArXiv ID: |
1507.08202 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt |
BORIS DOI: |
10.7892/boris.87602 |
URI: |
https://boris.unibe.ch/id/eprint/87602 |
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