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 π^{0} production cross section is measured differentially in transverse momentum (p_{T}) for 1.5<10.0 GeV and in center-of-mass pseudorapidity (η_{c.m.}) regions 2.5<3.5 (forward) and -4.0<-3.0 (backward) defined relative to the proton beam direction. The forward measurement shows a sizable suppression of π^{0} production, while the backward measurement shows the first evidence of π^{0} 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.
Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:4(2023 Jul 24), pp. 042302.1-042302.12. [10.1103/PhysRevLett.131.042302]
Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions
M. Lazzaroni;D. Marangotto;A. Merli;N. Neri;M. Petruzzo;E. Spadaro Norella;
2023
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 π^{0} production cross section is measured differentially in transverse momentum (p_{T}) for 1.5<10.0 GeV and in center-of-mass pseudorapidity (η_{c.m.}) regions 2.5<3.5 (forward) and -4.0<-3.0 (backward) defined relative to the proton beam direction. The forward measurement shows a sizable suppression of π^{0} production, while the backward measurement shows the first evidence of π^{0} 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.| File | Dimensione | Formato | |
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PhysRevLett.131.042302.pdf
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