Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data

Abstract

We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma 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-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.

11 pages (Latex), 3 figures (Postscript); updated experimental data included, references added, accepted for publication in Phys. Rev. Lett

References in corpus (3)

• Quarkonium Production at High-Energy Colliders
• Power counting and effective field theory for charmonium
• J/psi plus dijet associated production in two-photon collisions

Cited by in corpus (67)

• Heavy quarkonium: progress, puzzles, and opportunities
• The Physics of Ultraperipheral Collisions at the LHC
• QCD and strongly coupled gauge theories: challenges and perspectives
• J/psi (psi') production at the Tevatron and LHC at O(α_s^4v^4) in nonrelativistic QCD
• Reconciling J/psi production at HERA, RHIC, Tevatron, and LHC with NRQCD factorization at next-to-leading order
• World data of J/psi production consolidate NRQCD factorization at NLO
• QCD corrections to J/psi polarization of hadronproduction at Tevatron and LHC
• Fragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium Production
• On the mechanisms of heavy-quarkonium hadroproduction
• New Observables in Inclusive Production of Quarkonia
• QCD corrections to J/psi production via color octet states at Tevatron and LHC
• Theory of hard photoproduction
• A complete NLO calculation of the $J/\psi$ and ${\psi }^{\prime }$ production at hadron colliders
• QCD radiative correction to color-octet $J/\psi$ inclusive production at B Factories
• Charmonium Production at High Energy in the k_T-Factorization Approach
• Complete next-to-leading-order corrections to J/psi photoproduction in nonrelativistic quantum chromodynamics
• QCD corrections to polarization of J/ψand Υat Fermilab Tevatron and CERN LHC
• Next-to-leading-order tests of nonrelativistic-QCD factorization with $J/\psi$ yield and polarization
• Estimate of the Hadronic Production of the Doubly Charmed Baryon ${\Xi }_{cc}$ under GM-VFN Scheme
• NRQCD Factorization and Velocity-dependence of NNLO Poles in Heavy Quarkonium Production
• J/psi plus jet associated production in two-photon collisions at next-to-leading order
• Quarkonium Physics at a Fixed-Target Experiment using the LHC Beams
• Hadronic Production of the Doubly Charmed Baryon ${\Xi }_{cc}$ with Intrinsic Charm
• Pair Production of Heavy Quarkonium and $B_c{(}^{\ast })$ Mesons at Hadron Colliders
• Hadronic production of the $P$-wave excited $B_c$-states ($B_{cJ,L=1}^{\ast }$)
• Bottomonium Production in the Regge Limit of QCD
• Automatic generation of quarkonium amplitudes in NRQCD
• Associated Production of Heavy Quarkonia and Electroweak Bosons at Present and Future Colliders
• QCD corrections to $J/\psi$ production in association with a $W$-boson at the LHC
• J/psi plus prompt-photon associated production in two-photon collisions at next-to-leading order
• Charmonium production in polarized high-energy collisions
• chi_{c1} and chi_{c2} decay angular distributions at the Fermilab Tevatron
• New factorization theory for heavy quarkonium production and decay
• Heavy quarkonium photoproduction in ultrarelativistic heavy ion collisions
• Photoproduction of $J/\psi$ in association with a $c\bar{c}$ pair
• QCD corrections to $J/\psi$ plus $Z^0$-boson production at the LHC
• $J/\psi +c+\bar{c}$ Photoproduction in $e^{+}{e}^{-}$ Scattering
• QCD Corrections to the Color-singlet $J/\psi$ Production in Deeply Inelastic Scattering at HERA
• Spin Studies of Nucleons in a Statistical Model
• Heavy quark and quarkonium production at CERN LEP2: k_T-factorization versus data
• Prompt J/psi plus photon associated electroproduction at DESY HERA
• Prompt heavy quarkonium production in association with a massive (anti)bottom quark at the LHC
• Revisiting the Real Graviton Effects at CERN LHC within the Quantum Gravity Theory with Large Extra Dimensions
• J/Psi and Psi' Polarizations in Polarized Proton-Proton Collisions at the RHIC
• NRQCD: Fundamentals and Applications to Quarkonium Decay and Production
• ${\rm Y}$ decay to two-charm quark jets as a Probe of the Color Octet Mechanism
• NLO QCD Corrections for $J/\psi +c+\bar{c}$ Production in Photon-Photon Collision
• NLO QCD corrections to pseudoscalar quarkonium production with two heavy flavors in photon-photon collision
• Perspectives for inclusive quarkonium production in photon-photon collisions at the LHC
• Polarized J/psi production from B mesons at the Tevatron
• Photoproduction of the $B_c$ meson at the future $e^{+}{e}^{-}$ colliders
• Associated Production of Bottomonia and Higgs Bosons at Hadron Colliders
• $J/\psi$ associated production with a bottom quark pair from the Higgs boson decay in next-to-leading order QCD
• High-energy photon collisions at the LHC - dream or reality?
• p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production mechanism
• Photoproduction of $J/\psi$ with forward hadron tagging in hadronic collisions
• Prompt $J/\psi$ photoproduction within the non-relativistic QCD framework at the CEPC
• Prompt J/psi production in charged-current deep-inelastic scattering
• Testing Color Evaporation in Photon-Photon Production of J/Psi at CERN LEP II
• Hadronic production of $B_s^{(\ast )}$ at TEVATRON and LHC
• ${\eta }_Q$ meson photoproduction in ultrarelativistic heavy ion collisions
• NLO Corrections to Dimuonium Production in Photon-Photon Collision
• ${\chi }_{cJ}$ Polarization in Polarized Proton-Proton Collisions at RHIC
• J/Psi production in direct and resolved gamma gamma collisions
• Quarkonium production in deep-inelastic scattering
• Heavy-quarkonium production at next-to-leading order
• Study $\gamma \gamma \to {\tau }^{+}{\tau }^{-}$ process including ${\tau }^{+}{\tau }^{-}$ spin information in Pb-Pb ultraperipheral collision and at Lepton collider