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17–24 Jul 2024
Prague
Europe/Prague timezone

Measurements of CP violation in B decays at Belle II

20 Jul 2024, 17:45
15m
South Hall 1B

South Hall 1B

Parallel session talk 05. Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics

Speaker

Dr Yu Nakazawa (KEK IPNS)

Description

The Belle II experiment has collected a 362 fb1 sample of e+eBB¯ decays at the Υ(4S) resonance. The asymmetric-energy SuperKEKB collider provides a boost to the B mesons in the laboratory frame, enabling measurements of time-dependent CP violation. We present measurements of both time-dependent and direct CP violation in hadronic B decays. Among the new results, we measure CP-violating parameters related to the determination of the least well-known angle of the unitarity triangle, ϕ2 (also known as α), using the decays B0ρ+ρ and B0π0π0. In addition, the penguin-sensitive B0J/ψπ0 decay is studied; the results from this mode constrain the systematic effects related to the determination of the unitarity-triangle angle ϕ1 (also known as β).

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Authors

Sven Vahsen (University of Hawaii (US)) Dr Yu Nakazawa (KEK IPNS)

Presentation materials