Measurement of the parity-violating asymmetry parameter α_b and the helicity amplitudes for the decay Λ_0b→J/ψΛ_0 with the ATLAS detector
Articolo
Data di Pubblicazione:
2014
Abstract:
A measurement of the parity-violating decay asymmetry parameter, α_b, and the helicity amplitudes for
the decay Λ_0b → J/ψ(μμ)Λ_0(pπ) is reported. The analysis is based on 1400 Λ_0b 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 Λ_0b and Λ¯_0b and 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.
the decay Λ_0b → J/ψ(μμ)Λ_0(pπ) is reported. The analysis is based on 1400 Λ_0b 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 Λ_0b and Λ¯_0b and 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.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
ATLAS; Lamda_b
Elenco autori:
Atlas, Coll; Conta, Claudio; Franchino, Silvia; Fraternali, Marco; Livan, Michele; Negri, Andrea; Rebuzzi, DANIELA MARCELLA; Rimoldi, Adele; Aad, G.
Link alla scheda completa:
Pubblicato in: