Pion pole light-by-light contribution to g-2 of the muon in a nonlocal chiral quark model

被引：44

作者：

Dorokhov, Alexander E. ^{[1
]}

Broniowski, Wojciech ^{[2
,3
]}

机构：

[1] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

[2] Polish Acad Sci, H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[3] Jan Kochanowski Univ Humanities & Sci, Inst Phys, PL-25406 Kielce, Poland

来源：

PHYSICAL REVIEW D | 2008年 / 78卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.78.073011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the pion-pole term of the light-by-light contribution to the g-2 of the muon in the framework of an effective chiral quark model with instantonlike nonlocal quark-quark interaction. The full kinematic dependence of the pion-photon transition form factors is taken into account. The dependence of form factors on the pion virtuality decreases the result by about 15% in comparison to the calculation where this dependence is neglected. Further, it is demonstrated that the QCD constraints suggested by Melnikov and Vainshtein are satisfied within the model. The corresponding contributions originate from the box diagram as well from the pion-pole term. Our chiral nonlocal model result for the pion-pole light-by-light contribution to (g-2)/2 of the muon is (6.3-6.7)x10(-10), which is in the ball park of other effective-model calculations.

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页数：12

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