Operator product expansion and quark condensate from lattice QCD in coordinate space

被引：92
作者：
Gimenez, V
Lubicz, V
Mescia, F
Porretti, V
Reyes, J
机构：
[1] Univ Valencia, Dept Fis Teor, E-46100 Valencia, Spain
[2] Univ Valencia, IFIC, E-46100 Valencia, Spain
[3] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy
[4] Ist Nazl Fis Nucl, Sez Roma 3, I-00146 Rome, Italy
[5] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[6] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
来源：
EUROPEAN PHYSICAL JOURNAL C | 2005年 / 41卷 / 04期
关键词：
D O I：
10.1140/epjc/s2005-02250-9
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 present a lattice QCD determination of the chiral quark condensate based on a new method. We extract the quark condensate from the operator product expansion of the quark propagator at short euclidean distances, where it represents the leading contribution in the chiral limit. From this study we obtain <(q) over barq > MS( 2 GeV) = -( 265 +/- 5 +/- 22MeV)(3), in good agreement with determinations of this quantity based on different approaches. The simulation is performed by using the O( a)- improved Wilson action at beta = 6.45 on a volume 32(3) x 70 in the quenched approximation.
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收藏
页码：535 / 544
页数：10
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