Diffractive η_c and η_b productions by neutrinos via neutral currents

Details Diffractive η_c and η_b productions by neutrinos via neutral currents Diffractive η_c and η_b productions by neutrinos via neutral currents

2002-12-04

arxiv.org/abs/hep-ph/0212067v1

Phys.Rev. D67 (2003) 093002

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTex4, 4 pages with 3 embedded figures

Scientific paper

10.1103/PhysRevD.67.093002

We report a first theoretical study for neutrino-induced diffractive productions of heavy pseudoscalar mesons, \eta_c and \eta_b, off a nucleon. Based on factorization formalism for exclusive processes, we evaluate the forward diffractive production cross section in perturbative QCD in terms of the light-cone Q\bar{Q} wave functions (WFs) of \eta_{c,b} mesons and the gluon distribution of the nucleon. The light-cone WFs of the \eta_c (\eta_b) meson are constructed to satisfy the spin symmetry relations with those of the J/\psi (\Upsilon) meson. The diffractive \eta_c production is governed by the axial-vector coupling of the longitudinally polarized Z boson to Q\bar{Q} pair, and the resulting \eta_c production rate is larger than the J/\psi one by one order of magnitude. We also discuss the production of bottomonium \eta_b, which shows up for higher beam energy.

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