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Measurement of the time-integrated mixing probability chi_d with a semileptonic double-tagging strategy and 34.6 {rm fb}⁻¹ of Belle II collision data
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arxiv 2106.00482 v1 pith:XD3WGRNA submitted 2021-06-01 hep-ex
Measurement of the time-integrated mixing probability chi_d with a semileptonic double-tagging strategy and 34.6 {rm fb}⁻¹ of Belle II collision data
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We present the first measurement of the time-integrated mixing probability $\chi_d$ using Belle II data collected at a center-of-mass (CM) energy of 10.58 GeV, corresponding to the mass of the $\Upsilon$(4S) resonance, with an integrated luminosity of $34.6 {\rm fb}^{-1}$ at the SuperKEKB $e^+ e^-$ collider. We reconstruct pairs of B mesons both of which decay to semileptonic final states. Using a novel methodology, we measure $\chi_d = 0.187 \pm 0.010 \text{ (stat.)} \pm 0.019 \text{ (syst.)}$, which is compatible with existing indirect and direct determinations.
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