Prompt J/{psi} production at e{sup +}e{sup {minus}} colliders

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.321· OSTI ID:531972

Yuan, F ^[1]; Qiao, C ^[2]; Chao, K ^[2]

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1. Department of Physics, Peking University, Beijing 100871, Peoples Republic of (China)
2. China Center of Advanced Science and Technology (World Laboratory), Beijing 100080, Peoples Republic of (China)

In this paper, we discuss the prompt J/{psi} production at e{sup +}e{sup {minus}} colliders via color-singlet and color-octet production mechanisms. The color-singlet production processes include (1) e{sup +}e{sup {minus}}{r_arrow}J/{psi}gg, (2) e{sup +}e{sup {minus}}{r_arrow}J/{psi}c{bar c}, and (3) e{sup +}e{sup {minus}}{r_arrow}q{bar q}ggJ/{psi} and e{sup +}e{sup {minus}}{r_arrow}q{bar q}g{chi}{sub c} followed by {chi}{sub c}{r_arrow}J/{psi}{gamma}. The color-octet production processes include (1) e{sup +}e{sup {minus}}{r_arrow}J/{psi}g and (2) e{sup +}e{sup {minus}}{r_arrow}J/{psi}q{bar q}. Of all these production channels, we find that the color-octet contributions dominate over the color-singlet contributions at any energy scale. At low energies ({radical}(s){lt}20 GeV), the dominant channel is e{sup +}e{sup {minus}}{r_arrow}J/{psi}g whereas at high energies e{sup +}e{sup {minus}}{r_arrow}J/{psi}q{bar q} will take the leading part. We also find that the energy spectrum for the color-octet J/{psi} production in process e{sup +}e{sup {minus}}{r_arrow}J/{psi}q{bar q} is very soft, and the mean energy of the produced J/{psi} is only about 10 {endash} 20 GeV even at very high energies (e.g., at 1000 GeV). The extraction of color-octet matrix elements from J/{psi} production in e{sup +}e{sup {minus}} collisions is also discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531972
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COLOR MODEL
ELECTRON-POSITRON INTERACTIONS
ENERGY SPECTRA
J PSI-3097 MESONS
OCTET MODEL
PARTICLE PRODUCTION
QUANTUM CHROMODYNAMICS