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arXiv 1107.1441hep-lathep-ph
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用扭曲质量Wilson费米子的格点量子色动力学确定m_b,f_B和f_Bs

Lattice QCD determination of m_b, f_B and f_Bs with twisted mass Wilson fermions

ETM Collaboration, P. Dimopoulos, R. Frezzotti, G. Herdoiza, V. Lubicz, C. Michael, D. Palao, G. C. Rossi, F. Sanfilippo, A. Shindler, S. Simula, C. Tarantino, M. Wagner

摘要:

本文用格点量子色动力学计算了b夸克的质量和B,B_s衰变常数,用N_f=2的扭曲质量Wilson费米子,在四种格点间距下进行了模拟。为了研究格点上的b夸克,本文采用了两种方法,一种是在已知静态极限的情况下,基于适当的比值,另一种是在粲质量区计算的相对论数据与通过模拟格点上的HQET得到的静态点之间进行插值。这两种方法提供了良好的一致性的结果。对于MSbar方案中的b夸克质量和衰变常数,我们得到m_b(m_b)=4.29(14)GeV,f_B=195(12)MeV,f_Bs=232(10)MeV,f_Bs/f_B=1.19(5)。作为分析的副产品,我们还得到了fD和fDs的衰变常数:fD =212(8)MeV,fDs =248(6)MeV,fDs/fD =1.17(5)。

英文摘要:

We present a lattice QCD determination of the b quark mass and of the B and B_s decay constants, performed with N_f=2 twisted mass Wilson fermions, by simulating at four values of the lattice spacing. In order to study the b quark on the lattice, two methods are adopted in the present work, respectively based on suitable ratios with exactly known static limit and on the interpolation between relativistic data, evaluated in the charm mass region, and the static point, obtained by simulating the HQET on the lattice. The two methods provide results in good agreement. For the b quark mass in the MSbar scheme and for the decay constants we obtain m_b(m_b)=4.29(14) GeV, f_B=195(12) MeV, f_Bs=232(10) MeV and f_Bs/f_B=1.19(5). As a byproduct of the analysis we also obtain the results for the f_D and f_Ds decay constants: f_D=212(8) MeV, f_Ds=248(6) MeV and f_Ds/f_D=1.17(5).

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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