# First measurement of the forward rapidity gap distribution in pPb collisions at 8 TeV

### Submission summary

 As Contributors: Dmitry Sosnov Preprint link: scipost_202107_00099v1 Date submitted: 2021-07-31 09:51 Submitted by: Sosnov, Dmitry Submitted to: SciPost Physics Proceedings Proceedings issue: DIS2021 Academic field: Physics Specialties: High-Energy Physics - Experiment

### Abstract

We present the forward rapidity gap spectra from proton-lead collisions for both I\!P-Pb and I\!P-p topologies measured at the CMS at a center-of-mass energy of 8.16 TeV. For the I\!P-Pb topology, the cross-section predicted by EPOS-LHC is a factor of two lower than the data while has reasonable description of the spectrum shape. For the I\!P-p topology, the EPOS-LHC, QGSJET~II and HIJING predictions are significantly lower than the data, what can be explained by a contribution of ultra-peripheral photoproduction events. The obtained data may be of significant input for understanding the high energy limit of QCD and modeling cosmic ray air showers.

###### Current status:
Editor-in-charge assigned