Cargando…

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

We present, for the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both pomeron-lead and pomeron-proton topologies. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy of $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$, i.e. almost 3...

Descripción completa

Detalles Bibliográficos
Autor principal: CMS Collaboration
Publicado: 2020
Materias:
Acceso en línea:http://cds.cern.ch/record/2719416
_version_ 1780965693845405696
author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description We present, for the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both pomeron-lead and pomeron-proton topologies. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy of $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$, i.e. almost 300 times higher than previous measurements of diffractive production in proton-nucleus collisions. For the pomeron-lead topology the EPOS-LHC predictions are a factor of two below the unfolded data but the model does give a reasonable description of the shape of the spectrum. For the pomeron-proton topology the EPOS-LHC, QGSJET II and HIJING generator predictions are all at least a factor of five below the data. 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 help in understanding the high energy limit of QCD and modeling cosmic ray air showers.
id cern-2719416
institution Organización Europea para la Investigación Nuclear
publishDate 2020
record_format invenio
spelling cern-27194162023-01-18T20:32:43Zhttp://cds.cern.ch/record/2719416CMS CollaborationFirst measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$Nuclear Physics - ExperimentWe present, for the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both pomeron-lead and pomeron-proton topologies. The analysis is performed over 10.4 units of pseudorapidity at a center-of-mass energy of $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$, i.e. almost 300 times higher than previous measurements of diffractive production in proton-nucleus collisions. For the pomeron-lead topology the EPOS-LHC predictions are a factor of two below the unfolded data but the model does give a reasonable description of the shape of the spectrum. For the pomeron-proton topology the EPOS-LHC, QGSJET II and HIJING generator predictions are all at least a factor of five below the data. 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 help in understanding the high energy limit of QCD and modeling cosmic ray air showers.CMS-PAS-HIN-18-019oai:cds.cern.ch:27194162020
spellingShingle Nuclear Physics - Experiment
CMS Collaboration
First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title_full First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title_fullStr First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title_full_unstemmed First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title_short First measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{Pb}$ collisions at $\sqrt{s_{NN}}=8.16~\mathrm{TeV}$
title_sort first measurement of the forward rapidity gap distribution in $\mathrm{p}\mathrm{pb}$ collisions at $\sqrt{s_{nn}}=8.16~\mathrm{tev}$
topic Nuclear Physics - Experiment
url http://cds.cern.ch/record/2719416
work_keys_str_mv AT cmscollaboration firstmeasurementoftheforwardrapiditygapdistributioninmathrmpmathrmpbcollisionsatsqrtsnn816mathrmtev