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  4. Two-particle azimuthal correlations in γp interactions using pPb collisions at √s<sub>NN</sub>=8.16 TeV
 
research article

Two-particle azimuthal correlations in γp interactions using pPb collisions at √sNN=8.16 TeV

Tumasyan, A.
•
Adam, W.
•
Bergauer, T.
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July 27, 2023
Physics Letters B

The first measurements of the Fourier coefficients (V-n Delta) of the azimuthal distributions of charged hadrons emitted from photon-proton (gamma p) interactions are presented. The data are extracted from 68.8nb(-1) of ultra-peripheral proton-lead (pPb) collisions at root s(NN)= 8.16 TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This gamma p system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The V-n Delta coefficients are presented in ranges of event multiplicity and transverse momentum (p(T)) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean p(T) of charged particles is smaller in gamma p than in pPb collisions. For both the gamma p and pPb samples, V-1 Delta is negative, V-2 Delta is positive, and V-3 Delta consistent with 0. For each multiplicity and p(T) range, V-2 Delta is larger for gamma p events. The gamma p data are consistent with model predictions that have no collective effects. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

  • Details
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Type
research article
DOI
10.1016/j.physletb.2023.137905
Web of Science ID

WOS:001060187600001

Author(s)
Tumasyan, A.
Adam, W.
Bergauer, T.
Dragicevic, M.
Del Valle, A. Escalante
Fruehwirth, R.
Jeitler, M.
Krammer, N.
Lechner, L.
Liko, D.
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Corporate authors
CMS Collaboration
Date Issued

2023-07-27

Publisher

Elsevier

Published in
Physics Letters B
Volume

844

Article Number

137905

Subjects

Physical Sciences

•

Cms

•

Photon-Proton

•

Collectivity

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
FunderGrant Number

FWF (Austria)

FNRS (Belgium)

FWO (Belgium)

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Available on Infoscience
February 16, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/203781
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