psi' polarization due to color-octet quarkonia production

被引：87
作者：
Leibovich, AK
机构：
[1] Lauritsen Laboratory, California Institute of Technology, Pasadena, CA
来源：
PHYSICAL REVIEW D | 1997年 / 56卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.56.4412
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the polarization of psi' due to gg--><Q(Q)over bar>[L-2S+1(J)(8)]g-->psi((lambda) color-octet quarkonia production. We find that at low transverse momenta the psi' is unpolarized due to the contributions proportional to the L=S=0 and L=S=1 color-octet matrix elements. As p(perpendicular to) increases, the psi' mesons become 100% polarized, as predicted by fragmentation calculations. Polarization due to lowest-order color-singlet production is also considered, which qualitatively has a similar shape to the color-octet production.
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收藏
页码：4412 / 4415
页数：4
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