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arXiv 0803.2158hep-ex
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B -> X_s γ衰变光子能谱矩的测量及|V_cb|和m_b的测定

Measurement of the Moments of the Photon Energy Spectrum in B -> X_s gamma Decays and Determination of |V_cb| and m_b at Belle

Belle Collaboration, C. Schwanda, P. Urquijo, E. Barberio, A. Limosani

摘要:

使用以前的Belle测量的包容性光子能量在$B\to X_sγ$衰变,我们确定的最小光子能量在$B$介子静止框架范围从1.8到2.3 GeV的频谱的第一和第二时刻。结合这些测量与最近的Belle数据的轻子能量和强子质量矩的$B\to X_c\ellν$衰变,我们执行拟合的理论表达式中导出的1 S和动力学质量计划和提取的Cabibbo-Kobayashi-Maskawa(CKM)矩阵元$V_{cb}$的大小,$b$ -夸克质量和其他非微扰参数。在1 S方案分析中,我们发现$|V_{cb}|=(41.56\pm 0.68(\mathrm{fit})\pm 0.08(τ_B))\times 10^{-3}$和$m_b^\mathrm{1S}=(4.723\pm 0.055)$ GeV。在动力学方案中,我们得到了$|V_{cb}|=(41.58\pm 0.69(\mathrm{fit})\pm 0.08(τ_B)\pm 0.58(\mathrm{th}))\times 10^{-3}$和$m_b^\mathrm{kin}=(4.543\pm 0.075)$ GeV.

英文摘要:

Using the previous Belle measurement of the inclusive photon energy in $B\to X_sγ$ decays, we determine the first and second moments of this spectrum for minimum photon energies in the $B$ meson rest frame ranging from 1.8 to 2.3 GeV. Combining these measurements with recent Belle data on the lepton energy and hadronic mass moments in $B\to X_c\ellν$ decays, we perform fits to theoretical expressions derived in the 1S and kinetic mass schemes and extract the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{cb}$, the $b$-quark mass and other non-perturbative parameters. In the 1S scheme analysis we find $|V_{cb}|=(41.56\pm 0.68(\mathrm{fit})\pm 0.08(τ_B))\times 10^{-3}$ and $m_b^\mathrm{1S}=(4.723\pm 0.055)$ GeV. In the kinetic scheme, we obtain $|V_{cb}|=(41.58\pm 0.69(\mathrm{fit})\pm 0.08(τ_B)\pm 0.58(\mathrm{th}))\times 10^{-3}$ and $m_b^\mathrm{kin}=(4.543\pm 0.075)$ GeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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