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Published version

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2023-07-28

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/221300

Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions

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https://doi.org/10.1103/PhysRevLett.131.042302

Abstract

The nuclear modification factor of neutral pions is measured in proton-lead collisions collected at a center-of-mass energy per nucleon of 8.16 TeV with the LHCb detector. The π0 production cross section is measured differentially in transverse momentum (pT) for 1.5 < pT < 10.0 GeV and in center-of-mass pseudorapidity (ηc:m:) regions 2.5 < ηc:m: < 3.5 (forward) and −4.0 < ηc:m: < −3.0 (backward) defined relative to the proton beam direction. The forward measurement shows a sizable suppression of π0 production, while the backward measurement shows the first evidence of π0 enhancement in proton-lead collisions at the LHC. Together, these measurements provide precise constraints on models of nuclear structure and particle production in high-energy nuclear collisions.

Subject

Col·lisions (Física nuclear), Física de partícules, Gran Col·lisionador d'Hadrons

Subject (English)

Collisions (Nuclear physics), Particle physics, Large Hadron Collider (France and Switzerland)

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citation

ALFONSO ALBERO, Alejandro, et al. Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions. Physical Review Letters. 2023. Vol. 131, num. 4. ISSN 0031-9007. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/221300

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