Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffractive \eta_c and \eta_b productions by neutrinos via neutral
  currents   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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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
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The categories of this paper are: nlin
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph