We calculate the cross section of J/ψ plus jet associated production in ep deepinelastic scattering within the factorization formalism of nonrelativistic quantum chromodynamics. Our analytic results disagree with previous analyses, both for the colour-singlet and colour-octet channels. Our theoretical predictions agree reasonably well with recent data taken by the H1 Collaboration at DESY HERA, significantly better than those obtained within the colour-singlet model.

), and photons, Z bosons, and W bosons in photon-photon, photonhadron, and hadron-hadron collisions within the factorization formalism of nonrelativistic quantum chromodynamics providing all contributing partonic cross sections in analytic form. In the case of photoproduction, we also include the resolved-photon contributions. We present numerical results for the processes involving J/ and cJ mesons appropriate for the Fermilab Tevatron, CERN LHC, DESY TESLA, operated in the e ϩ e Ϫ and ␥␥ modes, and DESY THERA.

We calculate the cross section of J/ψ inclusive production in neutrino-nucleon deep-inelastic scattering via the weak neutral current within the factorization formalism of nonrelativistic quantum chromodynamics. Besides J/ψ single production via the Z-gluon fusion mechanism, we also consider J/ψ plus hadron-jet associated production. We take into account both direct production and feed-down from directly-produced heavier charmonia. We present theoretical predictions for the J/ψ transverse-momentum and rapidity distributions, which can be measured in the CHORUS and NOMAD experiments at CERN, including conservative error estimates. In order to interpret a recent CHORUS measurement of the total cross section, we also estimate the contribution due to J/ψ prompt production via diffractive processes using the vector-meson dominance model. 13.60.Hb, 13.60.Le, 14.40.Gx (8) 1 , and O ψ 3 P (8) J , with J = 0, 1, 2, while those of the P -wave charmonia χ cJ are O χ cJ 3 P (1) J and O χ cJ 3 S (8) 1 . They satisfy the multiplicity relations O ψ 3 P (8) J = (2J + 1) O ψ 3 P (8) 0

The fragmentation functions D a→H (x, µ 2 ) of a heavy hadron H, with mass m H , satisfy the phase-space constraint D a→H (x, µ 2 ) = 0 for x < m 2 H /µ 2 , which is violated by the naive µ 2 evolution equations. Using appropriately generalized µ 2 evolution equations, we reconsider the inclusive hadroproduction of prompt J/ψ mesons with high transverse momenta in the framework of the factorization formalism of nonrelativistic quantum chromodynamics, and determine the resulting shifts in the values of the leading colour-octet matrix elements, which are fitted to data from the Fermilab Tevatron.

We study the associated production of bottomonia and Higgs bosons at hadron colliders within the factorization formalism of nonrelativistic quantum chromodynamics providing all contributing partonic cross sections in analytic form. While such processes tend to be suppressed in the standard model, they may have interesting cross sections in its minimal supersymmetric extension, especially at large values of tan β, where the bottom Yukawa couplings are enhanced. We present numerical results for the processes involving the lighter CP -even h 0 boson and the CP -odd A 0 boson appropriate for the Fermilab Tevatron and the CERN LHC.