Color-octet contributions to J/psi photoproduction

被引:154
作者
Cacciari, M
Kramer, M
机构
[1] Deutsches Elektronen-Synchrotron DESY, Hamburg
关键词
D O I
10.1103/PhysRevLett.76.4128
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have calculated the leading color-octet contributions to the production of J/psi particles in photon-proton collisions. Using the values for the color-octet matrix elements extracted from fits to prompt J/psi data at the Fermilab Tevatron, we demonstrate that distinctive color-octet signatures should be visible in J/psi photoproduction. However, these predictions appear at variance with recent experimental data obtained at HERA, indicating that the phenomenological importance of the color-octet contributions is smaller than expected from theoretical considerations and suggested by the Fermilab Tevatron fits.
引用
收藏
页码:4128 / 4131
页数:4
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