Speaker
Description
We present the forward rapidity gap spectra from proton-lead (pPb) collisions for both pomeron-Pb and pomeron-p topologies measured at CMS. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy of 8.16 TeV, almost 300 times higher than previous measurements of diffractive production in proton-nucleus collisions. For the pomeron-Pb topology, the cross-section predicted by EPOS-LHC is a factor of two lower than the measured data while the model gives a reasonable description of the shape of the spectrum. For the pomeron-p topology, the EPOS-LHC, QGSJET II, and HIJING generator predictions are lower than the data by at least a factor of five. This effect can be explained by a significant contribution of ultra-peripheral photoproduction events mimicking the signature of diffractive processes. The obtained data may be of significant input for understanding the high energy limit of QCD and modeling cosmic ray air showers.
