Dynamical twisted mass fermions with light quarks
Dynamical twisted mass fermions with light quarks
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DOI：
10.1016/j.physletb.2007.04.054
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发表时间：
2007-01
影响因子：
4.4
通讯作者：
P. Boucaud;P. Dimopoulos;F. Farchioni;R. Frezzotti;V. Gimenez;G. Herdoiza;K. Jansen;V. Lubicz;G. Martinelli;C. McNeile;C. Michael;I. Montvay;D. Palao;M. Papinutto;J. Pickavance;G. Rossi;L. Scorzato;A. Shindler;S. Simula;C. Urbach;U. Wenger;Etm collaboration
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文献类型：
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作者：
P. Boucaud;P. Dimopoulos;F. Farchioni;R. Frezzotti;V. Gimenez;G. Herdoiza;K. Jansen;V. Lubicz;G. Martinelli;C. McNeile;C. Michael;I. Montvay;D. Palao;M. Papinutto;J. Pickavance;G. Rossi;L. Scorzato;A. Shindler;S. Simula;C. Urbach;U. Wenger;Etm collaboration
本文给出了赝标质量在300 MeV ~ 550 MeV范围内，Nf=2简并Wilson扭曲质量夸克在最大扭曲下的动力学模拟结果.由于最近开发的HMC算法变体，达到如此小的质量成为可能。在晶格间距a = 0.1 fm的一个值处执行模拟。为了使O（a）得到改善并使剩余的O（a2）截止效应较小，通过要求无扭夸克质量为零，将理论调整到最大扭度。赝标衰变常数和赝标质量的精确结果与手征微扰理论的预测相矛盾，低能常数F，l ′ 3和l ′ 4的计算具有很小的统计误差。
We present results of dynamical simulations of Nf=2 degenerate Wilson twisted mass quarks at maximal twist in the range of pseudo scalar masses 300 MeV≲mPS≲550 MeV. Reaching such small masses was made possible owing to a recently developed variant of the HMC algorithm. The simulations are performed at one value of the lattice spacing a≲0.1 fm. In order to have O(a) improvement and aiming at small residual O(a2) cutoff effects, the theory is tuned to maximal twist by requiring the vanishing of the untwisted quark mass. Precise results for the pseudo scalar decay constant and the pseudo scalar mass are confronted with chiral perturbation theory predictions and the low energy constants F, l¯3and l¯4are evaluated with small statistical errors.