Light vector meson photoproduction at large momentum transfer

被引：0
|
作者：
Ivanov, DY [1 ]
机构：
[1] Univ Regensburg, Inst Theoret Phys, D-93053 Regensburg, Germany
[2] Inst Math, Novosibirsk 630090, Russia
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2001年 / 99A卷
关键词：
D O I：
10.1016/S0920-5632(01)01337-8
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We have studied in perturbative QCD all independent helicity amplitudes describing the photoproduction of light vector mesons at large t. We found a new hard production mechanism which is related to the possibility for a real photon to fluctuate into a massless q (q) over bar pair in a chiral-odd spin configuration. Each helicity amplitude is given as a sum of chiral-even contribution (when the helicities of quark and antiquark are antiparallel) and this additional chiral-odd part (where the helicities of quark and antiquark are parallel). All amplitudes are expressed in terms of short distance asymptotics of the light-cone wave functions of vector meson and photon. The chiral-odd contribution is large, it leads to a dominance of the non spin-flip amplitude in a very broad region of intermediately high /t/.
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页码：217 / 221
页数：5
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