Angular analysis of B+ρ+ρ0 decays reconstructed in 2019, 2020, and 2021 Belle~II data

Sumitted to PubDB: 2022-06-24

Category: Conference papers and plots, Visibility: Public

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Authors Mirco Dorigo, Eldar Ganiev, Riccardo Manfredi, Sebastiano Raiz, Diego Tonelli
Date June 23, 2022
Belle II Number BELLE2-CONF-PH-2022-005
Abstract We report on a Belle II measurement of the branching fraction~(B), longitudinal polarization fraction ~(fL), and \CP~asymmetry~A\CP of B+ρ+ρ0 decays. We reconstruct B+ρ+(π+π0(γγ))ρ0(π+π) decays in a sample of SuperKEKB electron-positron collisions collected by the Belle II experiment in 2019, 2020, and 2021 at the Υ(4S) resonance and corresponding to 190\,fb1 of integrated luminosity. We fit the distributions of the difference between expected and observed B candidate energy, continuum-suppression variable, dipion masses, and decay angles of the resulting samples, to determine a signal yield of 345±31 events. The signal yields are corrected for efficiencies determined from simulation and control data samples to obtain Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' The results agree with known determinations. This is the first measurement of A\CP in \PBplus\Prhoplus\Prhozero decays reported by Belle II.

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