Two-particle azimuthal correlations in γp interactions using pPb collisions at √sNN = 8.16 TeV
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Date
2023-09-10
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Journal Article
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Abstract
The first measurements of the Fourier coefficients (V_n∆) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb⁻¹ of ultra-peripheral proton-lead (pPb) collisions at √sNN=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp 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∆ 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 γp than in pPb collisions. For both the γp and pPb samples, V_1∆ is negative, V_2∆ is positive, and V_3∆ consistent with 0. For each multiplicity and p_T range, V_2∆ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.
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published
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Volume
844
Pages / Article No.
137905
Publisher
Elsevier
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Subject
CMS; Photon-proton; Collectivity
Organisational unit
03904 - Wallny, Rainer / Wallny, Rainer
03593 - Dissertori, Günther / Dissertori, Günther
09720 - de Cosa, Annapaola / de Cosa, Annapaola
Notes
Funding
758316 - Majorana neutrino discovery strategy with CMS (EC)