First measurement of the forward rapidity gap distribution in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV

CMS Collaboration

Preprint

PUBDB-2023-00855

First measurement of the forward rapidity gap distribution in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV

CMS Collaboration (Collaboration author)DESY*

2023

[10.3204/PUBDB-2023-00855]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2023-00855

Report No.: CERN-EP-2022-164; CMS-HIN-18-019; arXiv:2301.07630

Abstract: For the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both proton and lead dissociation processes are presented. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV, almost 300 times higher than in previous measurements of diffractive production in proton-nucleus collisions. For lead dissociation processes, which correspond to the pomeron-lead event topology, the EPOS-LHC generator predictions are a factor of two below the data, but the model gives a reasonable description of the rapidity gap spectrum shape. For the pomeron-proton topology, the EPOS-LHC, QGSJET II, and HIJING predictions are all at least a factor of five lower than the data. The latter effect might be explained by a significant contribution of ultra-peripheral photoproduction events mimicking the signature of diffractive processes. These data may be of significant help in understanding the high energy limit of quantum chromodynamics and for modeling cosmic ray air showers.

Keyword(s): rapidity, gap ; spectrum, gap ; diffraction, production ; energy, high ; showers, atmosphere ; nucleon, pair ; topology ; TeV ; dissociation ; cosmic radiation ; quantum chromodynamics ; photoproduction ; air ; CERN LHC Coll ; signature ; p nucleus

Note: Submitted to Physical Review D. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-18-019 (CMS Public Pages)

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