Using a transverse momentum cutoff in kT factorization, the authors fix the soft and semihard mean multiplicities in a double negative binomial fit and find that KNO scaling holds only for narrow rapidity windows and that KNO violation is not caused by the rising semihard fraction.
Coherent photoproduction of light vector mesons off nuclear targets in the dipole picture
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abstract
We study the coherent photoproduction of light vector mesons in Pb-Pb collisions in the framework of color dipole approach. We employ the Glauber--Gribov formalism supplemented by an effective suppression factor $R_G$ accounting for the gluon shadowing correction. We adjust the latter to reproduce the deep inelastic structure function $F_2$ (E665) and $\rho$ meson photoproduction (ALICE) data. We achieve a good description of the available data points with $R_G = 0.85$ at scale $M_\rho^2/4 = 0.15$ GeV$^2$. In addition, employing this suppression factor, we present predictions for coherent $\rho(2S)$, $\omega(1S,2S)$ and $\phi(1S,2S)$ photoproduction observables using the holographic vector meson wave functions.
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Soft and semihard components of multiplicity distributions in the $k_T$ factorization approach
Using a transverse momentum cutoff in kT factorization, the authors fix the soft and semihard mean multiplicities in a double negative binomial fit and find that KNO scaling holds only for narrow rapidity windows and that KNO violation is not caused by the rising semihard fraction.