Neutral pion(pi(0)) and eta meson production cross sections were measured up to unprecedentedly high transverse momenta (p(T)) in p-Pb collisions at root s(NN) = 8.16 TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval -1.3 < y < 0.3 in the ranges of 0.4 < p(T) < 200 GeV/cand 1.0 < p(T) < 50 GeV/c, respectively. The respective nuclear modification factor (R-pPb) is presented for p(T) up to of 200 and 30 GeV/c, where the former was achieved by extending the pi(0) measurement in pp collisions at root s = 8 TeV using the merged cluster technique. The values of R-pPb are below unity for p(T) < 10 GeV/c, while they are consistent with unity for p(T) > 10 GeV/c, leaving essentially no room for final state energy loss. The new data provide strong constraints for nuclear parton distribution and fragmentation functions over a broad kinematic range and are compared to model predictions as well as previous results at root s(NN) = 5.02 TeV. (c) 2022 European Organization for Nuclear Research. 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).

Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p???Pb collisions at TeV

P. Cortese;L. Ramello;M. Sitta;
2022-01-01

Abstract

Neutral pion(pi(0)) and eta meson production cross sections were measured up to unprecedentedly high transverse momenta (p(T)) in p-Pb collisions at root s(NN) = 8.16 TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval -1.3 < y < 0.3 in the ranges of 0.4 < p(T) < 200 GeV/cand 1.0 < p(T) < 50 GeV/c, respectively. The respective nuclear modification factor (R-pPb) is presented for p(T) up to of 200 and 30 GeV/c, where the former was achieved by extending the pi(0) measurement in pp collisions at root s = 8 TeV using the merged cluster technique. The values of R-pPb are below unity for p(T) < 10 GeV/c, while they are consistent with unity for p(T) > 10 GeV/c, leaving essentially no room for final state energy loss. The new data provide strong constraints for nuclear parton distribution and fragmentation functions over a broad kinematic range and are compared to model predictions as well as previous results at root s(NN) = 5.02 TeV. (c) 2022 European Organization for Nuclear Research. 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).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11579/144020
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