Vector meson photoproduction from the BFKL equation 2. Phenomenology

Abstract

Diffractive vector meson photoproduction accompanied by proton dissociation is studied for large momentum transfer. The process is described by the non-forward BFKL equation which we use to compare to data collected at the HERA collider.

Diffractive vector meson production

“…Such an enhancement due to the chiral-odd γqq transitions [242] is present in calculations of Poludniowski et al [261].…”

“…(213) A comparison of the results (212) and (213) shows an importance of the finite mass effects in the t-dependence, see also ′ > |t|/(900(GeV 2 ) + |t|) from H1 collaboration [79]. The theoretical results for the pQCD two-gluon exchange with fixed and running α S and scaling BFKL approximations are from Poludniowski et al [261].…”

“…Figure 33: The spin density matrix elements for proton-dissociative J/ψ production as a function of −t measured by H1 [79]. The predictions form the BFKL (solid curves) and pQCD two-gluon approximations (dashed curves) are shown for a comparison [261]. Figure 34: The spin density matrix elements for proton-dissociative ρ (left box) and φ (right box) production as a function of −t measured by ZEUS [77].…”

“…Figure 34: The spin density matrix elements for proton-dissociative ρ (left box) and φ (right box) production as a function of −t measured by ZEUS [77]. The predictions for from the BFKL (solid curves) and pQCD two-gluon approximations (dashed curves) are shown for a comparison [261]. As emphasized in Introduction, see Section 1.3, the vector meson production at a given Q 2 probes the gluon content of a target at pQCD factorization scale Q 2 ∼ (Q 2 + m 2 V )/4, see (9).…”

“…The theoretical results for the pQCD two-gluon exchange with fixed and running α S and scaling BFKL approximations are from Poludniowski et al [261]. tivity the the pomeron trajectory, see Fig.…”