Color fluctuation phenomena in gamma A collisions at the LHC

Mark Strikman

Abstract


We explain that  color fluctuations (CFs) in the light-cone photon  wave function  lead to much stronger shadowing in the coherent production both in the soft regime ($\rho$ -meson photoproduction)  and in the hard regime
($J/\psi$ photoproduction). We make CF based  predictions for the distribution over the number  of wounded nucleons $\nu$ in the inelastic photon--nucleus scattering.  We show that CFs lead to a dramatic enhancement of this distribution at $\nu=1$ and large $\nu > 10$.
Our predictions can be tested in proton--nucleus and nucleus--nucleus ultraperipheral collisions.



Keywords


CERN report; contribution; photon - nucleus interactions

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DOI: http://dx.doi.org/10.23727/CERN-Proceedings-2018-001.151

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