Prompt Upsilon and Psi Production at LEP

Abstract

Color-octet contributions to quarkonia production at LEP are studied herein. The short distance formation of heavy quark-antiquark pairs in color-octet configurations via gluon fragmentation processes is significantly enhanced relative to the creation of color-singlet pairs via heavy quark fragmentation. But the subsequent long distance hadronization of these colored pairs into physical quarkonium bound states is suppressed compared to the nonperturbative evolution of their colorless counterparts. We find that the overall LEP rates for gluon fragmentation into prompt Upsilon and Psi vector bosons exceed those from heavy quark fragmentation. Inclusion of the dominant color-octet quarkonium production channel eliminates sizable discrepancies between previous predictions and recent measurements of prompt $Z \to \Jpsi+X$, $Z\to {\psi }^{\prime }+X$ and $Z\to {\rm Y}+X$ branching fractions.

15 pages, harvmac, 3 uuencoded figures

References in corpus (10)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Quarkonium Wave Functions at the Origin
• Fragmentation production of J/psi and psi' at the Tevatron
• Spin symmetry predictions for heavy quarkonia alignment
• Charmonium Production at the Tevatron
• J/psi Production via Fragmentation at the Tevatron
• Gluon Fragmentation into P-wave Heavy Quarkonium
• Fragmentation contribution to quarkonium production in hadron collision
• J/Psi Production from Electromagnetic Fragmentation in Z decay

Cited by in corpus (44)

• Color-octet quarkonia production II
• NLO Production and Decay of Quarkonium
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Production of Heavy Quarkonium in High Energy Colliders
• Color-octet mechanism in $\gamma +p\to J/\psi +X$
• Resumming the color-octet contribution to e+ e- -> J/psi + X
• Quarkonium Photoproduction at Next-to-leading Order
• J/psi plus jet associated production in two-photon collisions at next-to-leading order
• Hard probes in heavy ion collisions at the LHC: heavy flavour physics
• Hadronization in Z0 decay
• Color-Octet $J/\psi$ Production in the ${\rm Y}$ Decay
• Search for the B_c Meson in Hadronic Z^0 Decays
• Color-Octet Contributions to J/psi Photoproduction via Fragmentation at HERA
• eta_c production at the Large Hadron Collider
• 1P1 charmonium production at the Tevatron
• Color-Octet Contributions in the Associate J/psi+gamma Hadroproduction
• Charmonium Production via Fragmentation at DESY HERA
• J/psi Production at LEP: Revisited and Resummed
• Lh_c
• The next-to-leading-order QCD correction to inclusive J/ψ(Υ) production in Z^0 decay
• Prompt Charmonium Production in Z Decays
• Inclusive J/psi production in Upsilon decay via color-octet mechanisms
• J/psi+gamma production at the LHC
• Color-octet heavy quarkonium productions in Z0 decays at LEP
• Momentum Distribution in the Decay B-->J/psi+X
• Resolution of the LHCb ${\eta }_c$ anomaly
• Color-octet mechanism and J/psi polarization at LEP
• Associated J/psi + gamma Photoproduction as a Probe of the Colour-Octet Mechanism
• Quarkonium production and NRQCD matrix elements
• Next-to-leading order Calculation of a Fragmentation Function in a Light-Cone Gauge
• Analysis of double-$J/\psi$ production in $Z$ decay at next-to-leading-order QCD accuracy
• Predictions for $h_c$ and $h_b$ production at the LHC
• Comprehensive studies of ${\rm Y}$ inclusive production in $Z$ boson decay
• The studies on $Z\to {\rm Y}(1S)+g+g$ at the next-to-leading-order QCD accuracy
• Charmonium Production in High Energy Collisions
• ${\chi }_{cJ}$ production in $e^{+}{e}^{-}$ annihilation
• Inclusive production of heavy quarkonium ${\eta }_Q$ via $Z$ boson decays within the framework of nonrelativistic QCD
• Prompt J/psi production in charged-current deep-inelastic scattering
• Two-Spin Asymmetry for ${\psi }^{\prime }$ Photoproduction with Color-Octet Mechanism
• Impact of $Z\to {\eta }_{c,b}+g+g$ on the inclusive ${\eta }_{c,b}$ meson yield in $Z$-boson decay
• Color-Singlet and Color-Octet Contributions to $J/\psi$ Photoproduction
• Next-to-leading order QCD corrections to $Z\to {\eta }_Q+Q+\bar{Q}$
• Inclusive Heavy-Quarkonium Production in Hadronic Collisions
• ${\psi }^{\prime }$ productions as a test of color-octet mechanism