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Abstract: The first measurements of the Fourier coefficients of the azimuthal distributions of charged hadrons emitted from photon-proton (?p) interactions are presented. The data are extracted from 68.8 nb?1 of ultra-peripheral proton-lead (pPb) collisions at using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This ?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 coefficients are presented in ranges of event multiplicity and transverse momentum () and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean of charged particles is smaller in ?p than in pPb collisions. For both the ?p and pPb samples, is negative, is positive, and consistent with 0. For each multiplicity and range, is larger for ?p events. The ?p data are consistent with model predictions that have no collective effects.
Fuente: Physics Letters B, 2023, 844, 137905
Editorial: Elsevier
Fecha de publicación: 01/09/2023
Nº de páginas: 24
Tipo de publicación: Artículo de Revista
DOI: 10.1016/j.physletb.2023.137905
ISSN: 0370-2693,1873-2445
Url de la publicación: https://doi.org/10.1016/j.physletb.2023.137905
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TUMASYAN, A
JAVIER ANDRES BROCHERO CIFUENTES
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
BARBARA CHAZIN QUERO
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
CELIA FERNANDEZ MADRAZO
PEDRO JOSE FERNANDEZ MANTECA
ANDREA GARCIA ALONSO
GERVASIO GOMEZ GRAMUGLIO
CELSO MARTINEZ RIVERO
PABLO MARTINEZ RUIZ DEL ARBOL
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
CEDRIC GERALD PRIEELS
FRANCESCA SHUN-NING ANNAROSA RICCI-TAM
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
IVAN VILA ALVAREZ
JESUS MANUEL VIZAN GARCIA
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