On the infrared sensitivity of the longitudinal cross section in e(+)e(-) annihilation

被引：0
|
作者：
Beneke, M [1 ]
Braun, VM [1 ]
Magnea, L [1 ]
机构：
[1] NORDITA, DK-2100 COPENHAGEN, DENMARK
来源：
NUCLEAR PHYSICS B | 1997年
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D O I：
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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 calculated the contributions proportional to beta(0)(n) alpha(s)(n+1) to the longitudinal fragmentation function in e(+)e(-) annihilation to all orders of perturbation theory. We use this result to estimate higher-order perturbative e corrections and nonperturbative corrections to the longitudinal cross section sigma(L) and discuss the prospects of determining sigma(s) from sigma(L). The structure of infrared renormalons in the perturbative expansion suggests that the longitudinal cross section for hadron production with fixed momentum fraction s receives nonperturbative contributions of order 1/(x(2)Q(2)), whereas the total cross section has a larger, 1/Q correction. This correction arises from very large longitudinal distances and is related to the behaviour of the Borel integral for the cross section with fixed x at large values of the Borel parameter.
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收藏
页码：183 / 188
页数：6
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