Deeply virtual and exclusive production of the omega meson

被引：0

作者：

Garçon, M ^{[1
]}

Morand, L ^{[1
]}

Doré, D ^{[1
]}

Laget, JM ^{[1
]}

Morrow, S ^{[1
]}

Sabatié, F ^{[1
]}

机构：

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

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2005年 / 20卷 / 8-9期

关键词：

vector meson electroproduction; omega; spin density matrix elements;

D O I：

10.1142/S0217751X05023694

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：

Exclusive ω electroproduction off the proton was measured at the highest possible four-momentum transfer with the (close to) 6 GeV beam now available at CEBAF. Cross sections are presented, together with an analysis of the w spin density matrix elements. Indications are that π(0) exchange in the t-channel (or rather the exchange of the corresponding saturating Regge trajectory) seems to dominate the process γ*p → ω p, even for photon virtuality Q(2) as large as 5 GeV2. Contributions of the handbag type, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract from this particular process.

引用

页码：1943 / 1946

页数：4

共 14 条

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