Fragmentation functions using e+e- data from PETRA and LEP

被引：0
作者：
Blumenstengel, M [1 ]
机构：
[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2003年 / 121卷
关键词：
D O I：
10.1016/S0920-5632(03)80351-1
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 investigate fragmentation of charged particles in e(+)e(-) annihilation at 22, 35, and 44 GeV in terms of their polar angle and momentum distributions. From the angular distribution the ratio of longitudinal to total hadronic cross-section was determined at an average energy scale of 36.6 GeV to be sigma(L)/sigma(tot) = 0.076 +/- 0.013. At next-to-leading order this yields alpha(s)(36.6GeV) = 0.150 +/- 0.025. The xi drop ln(1/x) distributions were used in conjunction with OPAL data from 91-208 GeV to study the scale dependence of the maximum position, xi(0). We studied flavour dependence of xi(0) as a possible explanation of this problem, using direct flavour dependent measurements of xi(0) at 91 GeV by OPAL.
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页码：51 / 54
页数：4
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