Probing partonic structure in γ γ → ππ near threshold

被引：224

作者：

Diehl, M ^{[1
]}

Gousset, T

Pire, B

Teryaev, O

机构：

[1] CEA Saclay, SPhN, DAPNIA, F-91191 Gif Sur Yvette, France

[2] SUBATECH, F-44307 Nantes, France

[3] Ecole Polytech, CPhT, F-91128 Palaiseau, France

[4] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Moscow Region, Russia

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.81.1782

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Hadron pair production gamma gamma --> h (h) over bar in the region where the c.m. energy is much smaller than the photon virtuality can be described in a factorized form, as the convolution of a partonic handbag diagram and generalized distribution amplitudes which are new nonperturbative functions describing the exclusive fragmentation of a quark-antiquark pair into two hadrons. Scaling behavior and a selection rule on photon helicity an signatures of this mechanism. The case where h is a pion is emphasized.

引用

页码：1782 / 1785

页数：4