Twist-3 contributions to wide-angle photoproduction of pions

被引：12

作者：

Kroll, P. ^{[1
]}

Passek-Kumericki, K. ^{[2
]}

机构：

[1] Univ Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany

[2] Rudjer Boskovic Inst, Theoret Phys Div, HR-10002 Zagreb, Croatia

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 07期

基金：

欧盟地平线“2020”;

关键词：

GENERALIZED PARTON DISTRIBUTIONS; EXCLUSIVE ELECTROPRODUCTION; COMPTON-SCATTERING; FORM-FACTORS; MESONS; QCD;

D O I：

10.1103/PhysRevD.97.074023

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate wide-angle pi(0) photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the pi(0) cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

引用

页数：16

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