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
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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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