Measurement of the parity-violating asymmetry parameter α b and the helicity amplitudes for the decay Λ b 0 → J / ψ Λ 0 with the ATLAS detector
Name
PhysRevD.89.092009.pdf
Description
Published version
Size
752.37 KB
Format
Unknown
Checksum (MD5)
20439216d1263fd86353534ac0ba6043
Author(s)
Taylor, Frank E
Date Issued
May 2014
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Aad, G., et al. "Measurement of the Parity-Violating Asymmetry Parameter Ab and the Helicity Amplitudes for the Decay Lambda(0)(B) -> J/Psi Lambda(0) with the Atlas Detector." Physical Review D 89 9 (2014).
Version
Final published version
Abstract
© 2014 CERN. A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λb0→J/ψ(μ+μ-)Λ0(pπ-) is reported. The analysis is based on 1400 Λb0 and Λ¯b0 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 Λb0 and Λ¯b0 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.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/physrevd.89.092009
