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

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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

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Title: 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
Author(s):
Aad, G.;
Abajyan, T.;
Abbott, B.;
Abdallah, J.;
Abdel Khalek, S.;
Abdinov, O.;
Aben, R.;
Izen, Joseph M.;
Leyton, Michael;
Lou, Xinchou;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2014-05-27
Format: Text
Item Type: Article
Keywords: B mesons
Particles (Nuclear physics)--Helicity
Muons
Decay (Nuclear physics)
Abstract: A 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.
Publisher: American Physical Society
ISSN: 1550-2368
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.89.092009
Persistent Link: http://hdl.handle.net/10735.1/4044
Bibliographic Citation: Aad, 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.89.092009
Terms of Use: CC BY 3.0 (Attribution)
©2014 CERN for the ATLAS Collaboration

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