Photoproduction of ${\eta }_c$ in NRQCD

Abstract

We present a calculation for the photoproduction of ${\eta }_c$ under the framework of NRQCD factorization formalism. We find a quite unique feature that the color-singlet contribution to this process vanishes at not only the leading order but also the next to leading order perturbative QCD calculations and that the dominant contribution comes from the color-octet ${}^1{S}_0^{(8)}$ subprocess. The nonperturbative color-octet matrix element of ${}^1{S}_0^{(8)}$ of ${\eta }_c$ is related to that of ${}^3{S}_1^{(8)}$ of $J/\psi$ by the heavy quark spin symmetry, and the latter can be determined from the direct production of $J/\psi$ at large transverse momentum at the Fermilib Tevatron. We then conclude that the measurement of this process may clarify the existing conflict between the color-octet prediction and the experimental result on the $J/\psi$ photoprodution.

11 pages, revtex, 4 ps figures

References in corpus (5)

• Kinematic Enhancement of Non-Perturbative Corrections to Quarkonium Production
• Quarkonium Photoproduction at Next-to-leading Order
• Charmonia production in hadron colliders and the extraction of colour-octet matrix elements
• J/psi production at the Tevatron and HERA: the effect of k_T smearing
• eta_c Production at the Tevatron: A test of NRQCD

Cited by in corpus (13)

• Quarkonium Production at High-Energy Colliders
• Theory of hard photoproduction
• Impact of ${\eta }_c$ hadroproduction data on charmonium production and polarization within NRQCD framework
• NRQCD Analysis of Bottomonium Production at the Tevatron
• Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data
• Heavy quarkonium photoproduction in ultrarelativistic heavy ion collisions
• ${\eta }_c$ production in photon - induced interactions at the LHC
• h_c Production at Hadron Colliders
• Hard diffractive ${\eta }_{\mathrm{c},\mathrm{b}}$ hadroproduction at the LHC
• Inelastic electroproduction of ${\eta }_c$ at ep colliders
• Inclusive diffractive ${\eta }_{\mathrm{c}}$ production in pp, pA and AA modes at the LHC
• Kinematic distributions of the ${\eta }_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework
• ${\eta }_c$ production associated with light hadrons at the B-factories and the future super B-factories