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
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© 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.
Physical Review D
American Physical Society (APS)
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).
Final published version
Nuclear and High Energy Physics