Space- and time-like electromagnetic pion form factors in light-cone pQCD

被引：12

作者：

Chen, Jiunn-Wei ^{[1
,2
]}

Kohyama, Hiroaki ^{[3
,4
]}

Ohnishi, Kazuaki ^{[1
,2
]}

Raha, Udit ^{[1
,2
]}

Shen, Yue-Long ^{[3
]}

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[2] Natl Taiwan Univ, Ctr Theoret Sci, Taipei 10617, Taiwan

[3] Acad Sinica, Inst Phys, Taipei 115, Taiwan

[4] Natl Ctr Theoret Sci, Div Phys, Hsinchu 300, Taiwan

来源：

PHYSICS LETTERS B | 2010年 / 693卷 / 02期

关键词：

Perturbative QCD; Electromagnetic form factor; Distribution amplitude; Sudakov suppression; Higher twist; EXCLUSIVE PROCESSES; SUM-RULES; FACTORIZATION; QCD; ELECTROPRODUCTION; EVOLUTION;

D O I：

10.1016/j.physletb.2010.05.082

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a combined analysis of the space- and time-like electromagnetic pion form factors in light-cone perturbative QCD with transverse momentum dependence and Sudakov suppression. Including the genuine non-perturbative "soft" QCD and the power suppressed twist-3 corrections to the standard twist-2 perturbative QCD result, the experimental form factor data available at moderate energies/momentum transfers can be explained reasonably well. To this end, the bulk of the existing discrepancy between the space- and time-like experimental data is ostensibly reconciled. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：102 / 107

页数：6

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