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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.ORCID iD: 0000-0002-0299-8236
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, p. 63-80Article 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, p. 63-80
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-180353DOI: 10.1016/j.physletb.2015.10.009ISI: 000365384600013Scopus ID: 2-s2.0-84945260682OAI: oai:DiVA.org:kth-180353DiVA, id: diva2:893320
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20160112

Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2018-05-15Bibliographically approved

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Strandberg, Jonas

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