Measurement of the branching fraction and CP-violating asymmetry of the decay B0→π0π0 using 387 million Υ(4S) decays in Belle II data

Abstract

We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B0→π0π0 decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387×106 Υ(4S) mesons. Using an optimized event selection, we find 125±20 signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is (1.25±0.23)×10-6 and the CP-violating asymmetry is 0.03±0.30

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Archivio della Ricerca - Università di Roma 3

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Last time updated on 11/06/2025

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