scholarly journals DiffractiveJ/ψproduction through the color-octet mechanism in resolved photon processes at DESY HERA

1999 ◽  
Vol 60 (9) ◽  
Author(s):  
Jia-Sheng Xu ◽  
Hong-An Peng
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals Quarkonium Production at Z0 and in ϒ(1S) Decay

1997 ◽  
Vol 12 (22) ◽  
pp. 3931-3940
Author(s):  
Kingman Cheung ◽  
Wai-Yee Keung ◽  
Tzu Chiang Yuan
Keyword(s):  
Color Singlet ◽  
Fixed Target ◽  
Production Rates ◽  
Fixed Target Experiments ◽  
Color Octet ◽  
Quarkonium Production ◽  
Color Octet Mechanism

The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarkonium production channels. In this paper we will summarize the studies of quarkonium production in Z0 and ϒ decays.

scholarly journals Color-octet mechanism andJ/ψpolarization at CERN LEP

1997 ◽  
Vol 55 (11) ◽  
pp. 6839-6843 ◽  
Author(s):  
Seungwon Baek ◽  
P. Ko ◽  
Jungil Lee ◽  
H. S. Song
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals POWER SCALING RULES FOR CHARMONIA PRODUCTION AND HQEFT

2001 ◽  
Vol 16 (25) ◽  
pp. 4189-4206 ◽  
Author(s):  
MIGUEL-ANGEL SANCHIS-LOZANO
Keyword(s):  
Heavy Quark ◽  
Effective Field ◽  
Tree Level ◽  
Power Scaling ◽  
Color Octet ◽  
Heavy Quark Mass ◽  
Effective Lagrangian ◽  
Pair Annihilation ◽  
Color Octet Mechanism ◽  
Local Operators

We discuss the power scaling rules along the lines of a complete heavy quark effective field theory (HQEFT) for the description of heavy quarkonium production through a color-octet mechanism. To this end, we firstly derive a tree-level heavy quark effective Lagrangian keeping both particle–antiparticle mixed sectors allowing for heavy quark–antiquark pair annihilation and creation, but describing only low-energy modes around the heavy quark mass. Then we show the consistency of using HQEFT fields in constructing four-fermion local operators à la NRQCD, to be identified with standard color-octet matrix elements. We analyze some numerical values extracted from charmonia production by different authors and their hierarchy in the light of HQEFT.

scholarly journals Color-octet mechanism in the inclusive D-wave charmonium productions in B decays

1997 ◽  
Vol 395 (1-2) ◽  
pp. 107-112 ◽  
Author(s):  
Pyungwon Ko ◽  
Jungil Lee ◽  
H.S. Song
Keyword(s):  
B Decays ◽  
Color Octet ◽  
Color Octet Mechanism ◽  
D Wave

scholarly journals υ decay into charmonium and the color octet mechanism

1994 ◽  
Vol 320 (1-2) ◽  
pp. 145-151 ◽  
Author(s):  
Howard D. Trottier
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals Color-octet mechanism inγ+p→Jψ+X

1996 ◽  
Vol 54 (7) ◽  
pp. 4312-4325 ◽  
Author(s):  
Pyungwon Ko ◽  
Jungil Lee ◽  
H. S. Song
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals Towards a Solution of the Charmonium Production Controversy:k⊥Factorization versus Color-Octet Mechanism

2001 ◽  
Vol 86 (8) ◽  
pp. 1446-1449 ◽  
Author(s):  
Ph. Hägler ◽  
R. Kirschner ◽  
A. Schäfer ◽  
L. Szymanowski ◽  
O. V. Teryaev
Keyword(s):  
Charmonium Production ◽  
Color Octet ◽  
Color Octet Mechanism ◽  
Versus Color

Color-octet mechanism in low-pT Ψ′-productions

1998 ◽  
Vol 629 (1-2) ◽  
pp. 282-285
Author(s):  
T. Morii ◽  
D. Roy ◽  
K. Sudoh ◽  
Z.-X. Sun ◽  
S. Tanaka ◽  
...  
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals AssociatedJ/ψ+γphotoproduction as a probe of the color-octet mechanism

1997 ◽  
Vol 55 (11) ◽  
pp. 7126-7133 ◽  
Author(s):  
Matteo Cacciari ◽  
Mario Greco ◽  
Michael Krämer
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism

scholarly journals Evidence for the Color-Octet Mechanism from CERN LEP2γγ→J/ψ+XData

2002 ◽  
Vol 89 (3) ◽  
Author(s):  
Michael Klasen ◽  
Bernd A. Kniehl ◽  
Luminiţa N. Mihaila ◽  
Matthias Steinhauser
Keyword(s):  
Color Octet ◽  
Color Octet Mechanism
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