Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b→J/ψΛ0 with the ATLAS detector

, The ATLAS collaboration (2014) Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b→J/ψΛ0 with the ATLAS detector. Physical Review D, 89 (9). ISSN 1550-7998

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Abstract

A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0b→J/ψ(μ+μ−)Λ0(pπ−) is reported. The analysis is based on 1400 Λ0b and Λ¯0b 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 Λ0b and Λ¯0b samples under the assumption of CP conservation, the value of αb 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2014 CERN, for the ATLAS Collaboration
ID Code:
69990
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Deposited On:
11 Jul 2014 23:04
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Oct 2020 03:06