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Measurement of the branching ratio Gamma(Lambda(0)(b) -> Psi(2S)Lambda(0))/Gamma(Lambda(0.)(b) -> J/Psi Lambda(0)) with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2857
2015 (English)In: Modern physics letters B, ISSN 0217-9849, Vol. 751, 63-80 p.Article in journal (Refereed) Published
Abstract [en]

An observation of the Λb 0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb 0→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 Λb 0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb 0→ψ(2S)Λ0 and Λb 0J/ψΛ0 decays is G{cyrillic}(Λb 0→ψ(2S)Λ0/G{cyrillic}(Λb 0J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 751, 63-80 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-180353DOI: 10.1016/j.physletb.2015.10.009ISI: 000365384600013ScopusID: 2-s2.0-84945260682OAI: oai:DiVA.org:kth-180353DiVA: diva2:893320
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20160112

Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2016-01-12Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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