Exclusive electroproduction of pions and vector mesons at HERMES

被引：0
|
作者：
Rostomyan, A [1 ]
机构：
[1] DESY, HERMES, D-2000 Hamburg, Germany
来源：
SPIN 2004: 16TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM | 2005年
关键词：
D O I：
10.1142/9789812701909_0083
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：
Hard exclusive meson production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) in the nucleon. GPDs parameterize the nucleon structure and provide a unified description of exclusive/inclusive reactions. This paper reports on the measurement of hard exclusive pi(+) and light vector meson production on an internal hydrogen gas target at HERMES using the 27.6 GeV HERA positron beam. First preliminary results for the total exclusive pi(+) production cross section are presented and compared with GPD calculations. Spin density matrix elements have been determined for exclusive rho(0) and phi productions, and the longitudinal component of the total cross section has also been compared to GPD calculations.
引用
收藏
页码：434 / 437
页数：4
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