Speaker
Dr.
Leonid Gladilin
(Joint Institute for Nuclear Research (JINR))
Description
The ATLAS detector at the LHC is collecting - among others - a large statistics of Bs and Lambda_b decays, allowing to study their production and decay properties. ATLAS has studied the different amplitudes contributing to the decay Bs -> J/psi phi (mu+mu-K+K-) with a combined analysis of decay time and angular correlations and using initial flavour tagging. The CP-violating phase phi_s is measured, as well as the width difference between the Bs eigenstates DeltaGamma_s and the average width Gamma_s. ATLAS collects also large samples of Lambda_b decays and measures the parity violating asymmetry parameter alpha_b in Lambda_b -> Lambda J/psi. The measurement - obtained from the measurement of angular correlations in the lambda_b final state - is compared to predictions based on perturbative QCD and heavy quarks effective theory.
Primary author
Collaboration ATLAS
(CERN)
