# XXVII International Workshop on Deep Inelastic Scattering and Related Subjects

Apr 8 – 12, 2019
Turin
Europe/Rome timezone

## Small-x physics in ultraperipheral collisions at the LHC

Apr 10, 2019, 11:45 AM
30m
Cavallerizza Reale - Aula Multifunzione

### Cavallerizza Reale - Aula Multifunzione

Via Verdi, 9 Turin
Parallel Session Talk WG2: Low-x and Diffraction

### Speaker

Prof. Mark Strikman (Penn State University)

### Description

We argue that ultraperipheral collisions at the LHC allow to study effects color fluctuations (CF) of the strength of interaction of photon in large and small size configurations. We make predictions for the distribution over the number of wounded nucleons ν in the inelastic photon-nucleus scattering and in events with charm production. We show that CFs lead to a dramatic enhancement of this distribution at ν=1 and large ν>10. We also study the implications of different scales and CFs in the photon wave function on the total transverse energy ΣET and and neutron production in inelastic γA scattering with different triggers. Our predictions can be tested in proton-nucleus and nucleus-nucleus ultraperipheral collisions at the LHC and will help to map CFs, whose first indications have already been observed at the LHC.

### Primary author

Prof. Mark Strikman (Penn State University)