Colour-octet contributions to J/ψ photoproduction via fragmentation at HERA

被引：30
|
作者：
Kniehl, BA
Kramer, G
机构：
[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst Phys, D-80805 Munich, Germany
[2] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany
来源：
PHYSICS LETTERS B | 1997年 / 413卷 / 3-4期
关键词：
D O I：
10.1016/S0370-2693(97)01126-X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study J/psi photoproduction via fragmentation at next-to-leading order in the QCD-improved parton model, using the nonrelativistic factorization formalism proposed by Bodwin, Braaten, and Lepage. We consider direct and resolved photoproduction of prompt J/psi mesons and chi(cJ) mesons radiatively decaying to J/psi + gamma, taking into account the formation of both colour-singlet and colour-octet c (c) over bar states. Adopting the values of the long-distance colour-octet matrix elements extracted from fits to prompt-J/psi data recently taken at the Fermilab Tevatron, we predict that measurements of J/psi photoproduction at DESY HERA should show a distinctive excess over the expectation based on the colour-singlet model at small values of the inelasticity variable z. This is complementary to the expected enhancement at z less than or similar to 1 due to the colour-octet contribution to photon-gluon fusion. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：416 / 421
页数：6
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