# Diffractive \\eta\_c and \\eta\_b productions by neutrinos via neutral currents

Source: [Diffractive \\eta\_c and \\eta\_b productions by neutrinos via neutral currents](<https://www.sota2.com/research/paper/68fa25d82c2a3760193b4526>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T11:00:39.335Z

Authors: A. Hayashigaki, K. Suzuki, K. Tanaka

Published: 2002-12-04T17:34:13.000Z

## Abstract

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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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/0212067>)

[PDF](<https://arxiv.org/pdf/hep-ph/0212067.pdf>)