在Belle II测量$B \rightarrow X_c \ell ν$衰变的强子质量矩$\langle M_X^n \rangle $
Measurement of Hadronic Mass Moments $\langle M_X^n \rangle $ in $B \rightarrow X_c \ell ν$ Decays at Belle II
摘要：
我们测量了半轻子$B \rightarrow X_c \ell ν$衰变中的前六个强子质量矩。强子质量矩与包含$B$衰变的其它观测量一起，可以在QCD的重夸克展开式中确定CKM矩阵元$|{V_{cb}}|$和$b$ -夸克$m_b$的质量.本次测量使用了2019年和2020年（3月至7月）在$Υ(4S)$共振处记录的Belle~II数据，对应于$34.6\;\mathrm{fb}^{-1}$的积分光度。应用全事件解释提供的强子标记算法，重建了衰变$Υ(4S) \rightarrow B \overline{B}$，完全重建了一个$B$介子。第二个$B$介子是通过选择一个高动量轻子来重建的。$X_c$系统是由电磁量能器中剩余的重建轨道和簇来识别的。我们报告了强子质量矩$\langle M_X^n \rangle $与$n=1,\dots,6$的初步结果，作为一个较低的削减信号$B$静止框架中的轻子动量的函数测量。
英文摘要：
We present measurements of the first six hadronic mass moments in semileptonic $B \rightarrow X_c \ell ν$ decays. The hadronic mass moments, together with other observables of inclusive $B$ decays, can be used to determine the CKM matrix element $|{V_{cb}}|$ and mass of the $b$-quark $m_b$ in the context of Heavy Quark Expansions of QCD. The Belle~II data recorded at the $Υ(4S)$ 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 $Υ(4S) \rightarrow B \overline{B}$ 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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