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arXiv 0709.4574hep-lathep-ph
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含扭曲质量费米子的Nf=2格点量子色动力学的轻夸克质量和赝标衰变常数

Light quark masses and pseudoscalar decay constants from Nf=2 Lattice QCD with twisted mass fermions

B. Blossier, Ph. Boucaud, P. Dimopoulos, F. Farchioni, R. Frezzotti, V. Gimenez, G. Herdoiza, K. Jansen, V. Lubicz, C. Michael, D. Palao, M. Papinutto, A. Shind… 展开作者

B. Blossier, Ph. Boucaud, P. Dimopoulos, F. Farchioni, R. Frezzotti, V. Gimenez, G. Herdoiza, K. Jansen, V. Lubicz, C. Michael, D. Palao, M. Papinutto, A. Shindler, S. Simula, C. Tarantino, C. Urbach, U. Wenger, ETM Collaboration

摘要:

本文给出了用格点量子色动力学计算上下夸克和奇异夸克的平均质量以及Nf=2的轻介子赝标衰变常数的结果。模拟是在一个单一的晶格间距值与扭曲的质量费米子作用在最大扭曲,这保证了自动O(a)-改善的物理量。夸克质量通过非微扰的RI-RNN重正化过程被重正化。结果表明,轻夸克质量为m_ud^{msbar}(2 GeV)= 3.85 ± 0.12 ± 0.40 MeV,m_s^{msbar}(2 GeV)= 105 ± 3 ± 9 MeV,m_s/m_ud = 27.3 ± 0.3 ± 1.2.我们还获得了fK = 161.7 ± 1.2 ± 3.1 MeV和fK/fpi=1.227 ± 0.009 ± 0.024。从这个比值出发,利用实验测定的γ(K-> mu nu(gamma))/γ(pi -> mu nu(gamma))和核β衰变的|Vud|的平均值,我们得到|Vus| =0.2192(5)(45),这与从Kl 3衰变和么正性约束得到的结果一致。

英文摘要:

We present the results of a lattice QCD calculation of the average up-down and strange quark masses and of the light meson pseudoscalar decay constants with Nf=2 dynamical fermions. The simulation is carried out at a single value of the lattice spacing with the twisted mass fermionic action at maximal twist, which guarantees automatic O(a)-improvement of the physical quantities. Quark masses are renormalized by implementing the non-perturbative RI-MOM renormalization procedure. Our results for the light quark masses are m_ud^{msbar}(2 GeV)= 3.85 +- 0.12 +- 0.40 MeV, m_s^{msbar}(2 GeV) = 105 +- 3 +- 9 MeV and m_s/m_ud = 27.3 +- 0.3 +- 1.2. We also obtain fK = 161.7 +- 1.2 +- 3.1 MeV and the ratio fK/fpi=1.227 +- 0.009 +- 0.024. From this ratio, by using the experimental determination of Gamma(K-> mu nu (gamma))/Gamma(pi -> mu nu (gamma)) and the average value of |Vud| from nuclear beta decays, we obtain |Vus|=0.2192(5)(45), in agreement with the determination from Kl3 decays and the unitarity constraint.

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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