BELLE2-CONF-PH-2020-011

Measurement of Hadronic Mass Moments in B->Xclv Decays at Belle II

Maximilian Welsch ; Florian Bernlochner

01 September 1993

Abstract: We present measurements of the first six hadronic mass moments in semileptonic $B \rightarrow X_c \ell \nu$ decays. The hadronic mass moments, together with other observables of inclusive $B$ decays, can be used to determine the CKM matrix element $\abs{V_{cb}}$ and mass of the $b$-quark $m_b$ in the context of Heavy Quark Expansions of QCD. The Belle~II data recorded at the $\Upsilon (4S)$ resonance in 2019 and 2020 (March-July), corresponding to an integrated luminosity of $34.6\;\mathrm{fb}^{-1}}, is used for this measurement. The decay$\Upsilon (4S) \rightarrow B \overline{B}$is reconstructed by applying the hadronic tagging algorithm provided by the Full Event Interpretation to fully reconstruct one$B$meson. The second$B$meson is reconstructed inclusively by selecting a high-momentum lepton. The$X_c$system is identified by the remaining reconstructed tracks and clusters in the electromagnetic calorimeter. We report preliminary results for the hadronic mass moments$\langle M_X^n \rangle $with$n=1,\dots,6$, measured as a function of a lower cut on the lepton momentum in the signal$B\$ rest frame.

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