O(a) improvement of the HYP static axial and vector currents at one-loop order of perturbation theory

被引:12
|
作者
Grimbach, Alois [1 ]
Guazzini, Damiano [2 ]
Knechtli, Francesco [1 ]
Palombi, Filippo [3 ]
机构
[1] Berg Univ Wuppertal, Fachbereich C, Fachbereich 9, D-42097 Wuppertal, Germany
[2] DESY, Theory Grp, D-15738 Zeuthen, Germany
[3] CERN, Div TH, Dept Phys, CH-1211 Geneva, Switzerland
来源
关键词
lattice gauge field theories; heavy quark physics; lattice QCD;
D O I
10.1088/1126-6708/2008/03/039
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We calculate analytically the improvement coefficients of the static axial and vector currents in O(a) improved lattice QCD at one-loop order of perturbation theory. The static quark is described by the hypercubic action, previously introduced in the literature in order to improve the signal-to-noise ratio of static observables. Within a Schrodinger Functional setup, we derive the Feynman rules of the hypercubic link in time-momentum representation. The improvement coefficients are obtained from on-shell correlators of the static axial and vector currents. As a by-product, we localise the minimum of the static self-energy as a function of the smearing parameters of the action at one-loop order and show that the perturbative minimum is close to its non-perturbative counterpart.
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页数:25
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