Measurement of the time-integrated mixing probability chi_d with a semileptonic double-tagging strategy and 34.6 fb^-1 of Belle II collision data

Sumitted to PubDB: 2021-06-01

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Authors	Florian Bernlochner, Jochen Dingfelder, Stephan Duell, Peter Lewis
Date	April 6, 2021
Belle II Number	BELLE2-CONF-PH-2021-004
Abstract	We present a first measurement of the time-integrated mixing probability chi_d using Belle II collision data corresponding to the integrated luminosity of 34.6 fb^-1. We reconstruct pairs of B mesons both decaying in semileptonic final states. Using a novel extraction methodology, we measure 0.192 +- 0.010 (stat.) +- 0.016 (syst.), which is compatible with existing indirect and direct determinations.