Evidence for the color-octet mechanism from CERN LEP2 γγ→J/ψ+X data -: art. no. 032001

被引：0

作者：

Klasen, M ^{[1
]}

Kniehl, BA ^{[1
]}

Mihaila, LN ^{[1
]}

Steinhauser, M ^{[1
]}

机构：

[1] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 03期

关键词：

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gammagamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavored hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavor those obtained within the traditional color-singlet model.

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页数：4

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