J/ψ and ψ′ total cross sections and formation times from data for charmonium suppression in pA collisions

被引：23
|
作者：
He, YB
Hüfner, J
Kopeliovich, BZ
机构：
[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany
[2] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[3] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia
来源：
PHYSICS LETTERS B | 2000年 / 477卷 / 1-3期
关键词：
D O I：
10.1016/S0370-2693(00)00198-2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The recent data for E866 on the x(F) dependence for charmonium suppression in pA collisions at 800 GeV are analyzed using a time- and energy-dependent preformed charmonium absorption cross section. For charmonium-nucleon c.m. energy 10 GeV the initially produced premeson has an absorption cross section of sigma(pr) similar or equal to 3 mb. At the same energy but for the developed charmonium stares one deduces for me total cross sections sigma(tot)(J/psi N) = (2.8 +/- 0.3) mb, sigma(tot)(J/psi'N) = (10.5 +/- 3.6) mb. The date are compatible with a formation time tau(1/2) = 0.6 fm/c in the rest frame of the charmonium. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：93 / 98
页数：6
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