Exclusive electroproduction of vector and pseudoscalar mesons at HERMES

被引:0
|
作者
Schill, C [1 ]
机构
[1] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
来源
SPIN 2002 | 2003年 / 675卷
关键词
D O I
暂无
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The exclusive production of vector and pseudoscalar mesons in deep-inelastic lepton scattering gives a mean to access the recently introduced generalized parton distributions (GPDs). The GPDs provide a unified description of hadronic structure, which can be investigated with many different reactions. Recent results are presented on the exclusive electroproduction of pi(+) mesons and on diffractive rho(0) and phi production on the proton, collected by the HERMES collaboration at DESY. The experimental results for the rho(0) and phi cross section are compared to calculations based on a description of the reactions in terms of GPDs. It is shown that quark exchange is the dominant production mechanism for rho(0) production, while for phi production only gluon exchanges contributes. For exclusively produced pi(+), an asymmetry in the azimuthal distribution around the virtual photon direction has been observed which depends on the orientation of the target spin.
引用
收藏
页码:308 / 312
页数:5
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