Two-particle azimuthal correlations in γp interactions using pPb collisions at √&lt;em&gt;s&lt;/em&gt;&lt;sub&gt;&lt;sub&gt;NN&lt;/sub&gt;&lt;/sub&gt;=8.16TeV

Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Caminada, L.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Missiroli, M.; Rohe, T.; Zhokin, A.

doi:10.1016/j.physletb.2023.137905

Two-particle azimuthal correlations in γp interactions using pPb collisions at √s_{_NN}=8.16TeV

Tumasyan A, Adam W, Bergauer T, Dragicevic M, Escalante Del Valle A, Frühwirth R, Jeitler M, Krammer N, Lechner L, Liko D, Caminada L, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Missiroli M, Rohe T, Zhokin A, et al.

Citation

Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Escalante Del Valle, A., Frühwirth, R., … Zhokin, A. (2023). Two-particle azimuthal correlations in γp interactions using pPb collisions at √s_{_NN}=8.16TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 844, 137905 (24 pp.). https://doi.org/10.1016/j.physletb.2023.137905

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:54121

The first measurements of the Fourier coefficients (V_nΔ) 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 √s_{_NN}=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_nΔ 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_1Δ is negative, V_2Δ is positive, and V_3Δ consistent with 0. For each multiplicity and p_T range, V_2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.