Measurement of the Parity-Violating Asymmetry Parameter α_b and the Helicity Amplitudes for the Decay Λ_b^0 → J/ψΛ⁰ with the ATLAS Detector

dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbajyan, T.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdel Khalek, S.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLeyton, Michaelen_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2014-10-01T21:11:19Z
dc.date.available2014-10-01T21:11:19Z
dc.date.created2014-05-27en_US
dc.date.issued2014-05-27en_US
dc.description.abstractA measurement of the parity-violating decay asymmetry parameter, α_b, and the helicity amplitudes for the decay Λ_b^0 → J/ψ(μ⁺μ⁻)Λ⁰(pπ⁻) is reported. The analysis is based on 1400 Λ_b^0 and Λ̅_b^0 baryons selected in 4.6 fb⁻¹ of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λ_b^0 and Λ̅_b^0 samples under the assumption of CP conservation, the value of α_b is measured to be 0.30 ± 0.16(stat) ± 0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.en_US
dc.identifier.bibliographicCitationAad, G., T. Abajyan, B. Abbott, J. Abdallah, et al. 2014. "Measurement of the parity-violating asymmetry parameter α_b and the helicity amplitudes for the decay Λ_b^0 → J/ψΛ⁰ with the ATLAS detector." Physical Review D - Particles, Fields, Gravitation and Cosmology 89(9), doi: 10.1103/PhysRevD.89.092009en_US
dc.identifier.issn1550-2368en_US
dc.identifier.issue9en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4044
dc.identifier.volume89en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.89.092009
dc.rightsCC BY 3.0 (Attribution)en_US
dc.rights©2014 CERN for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.sourcePhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.subjectB mesonsen_US
dc.subjectParticles (Nuclear physics)--Helicityen_US
dc.subjectMuonsen_US
dc.subjectDecay (Nuclear physics)en_US
dc.titleMeasurement of the Parity-Violating Asymmetry Parameter α_b and the Helicity Amplitudes for the Decay Λ_b^0 → J/ψΛ⁰ with the ATLAS Detectoren_US
dc.typeTexten_US
dc.type.genreArticleen_US

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