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

LHCb Collaboration

doi:10.1103/PhysRevLett.131.042302

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

LHCb Collaboration

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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.

Original language	English
Article number	042302
Number of pages	12
Journal	Physical Review Letters
Volume	131
DOIs	https://doi.org/10.1103/PhysRevLett.131.042302
Publication status	Published - 24 Jul 2023

Bibliographical note

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-053.html (LHCb public pages)

Keywords

nucl-ex
hep-ex

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10.1103/PhysRevLett.131.042302Licence: Creative Commons: Attribution (CC BY)

LHCb2023NuclearFinal published version, 16.4 MBLicence: Creative Commons: Attribution (CC BY)

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@article{33379c44e32948098e88c45f4ca6891a,

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

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.",

keywords = "nucl-ex, hep-ex",

author = "{LHCb Collaboration} and R. Aaij and Abdelmotteleb, {A. S. W.} and Beteta, {C. Abellan} and F. Abudin{\'e}n and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and C. Agapopoulou and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and K. Akiba and J. Albrecht and F. Alessio and M. Alexander and Albero, {A. Alfonso} and Z. Aliouche and Cartelle, {P. Alvarez} and S. Amato and Amey, {J. L.} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and M. Andreotti and D. Ao and F. Archilli and A. Artamonov and S. Bifani and R. Calladine and M. Charles and N. Cooke and V. Duk and P. Ilten and D. Johnson and R. Piandani and J. Plews and D. Popov and N. Sahoo and A. Sergi and Slater, {M. W.} and Swallow, {P. N.} and Z. Wang and Watson, {N. K.} and Williams, {M. R. J.} and Williams, {M. R. J.}",

note = "All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-053.html (LHCb public pages)",

year = "2023",

month = jul,

day = "24",

doi = "10.1103/PhysRevLett.131.042302",

language = "English",

volume = "131",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

}

TY - JOUR

T1 - Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abdelmotteleb, A. S. W.

AU - Beteta, C. Abellan

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A. Alfonso

AU - Aliouche, Z.

AU - Cartelle, P. Alvarez

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Ao, D.

AU - Archilli, F.

AU - Artamonov, A.

AU - Bifani, S.

AU - Calladine, R.

AU - Charles, M.

AU - Cooke, N.

AU - Duk, V.

AU - Ilten, P.

AU - Johnson, D.

AU - Piandani, R.

AU - Plews, J.

AU - Popov, D.

AU - Sahoo, N.

AU - Sergi, A.

AU - Slater, M. W.

AU - Swallow, P. N.

AU - Wang, Z.

AU - Watson, N. K.

AU - Williams, M. R. J.

N1 - All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-053.html (LHCb public pages)

PY - 2023/7/24

Y1 - 2023/7/24

N2 - 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.

AB - 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.

KW - nucl-ex

KW - hep-ex

U2 - 10.1103/PhysRevLett.131.042302

DO - 10.1103/PhysRevLett.131.042302

M3 - Article

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 042302

ER -

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

Abstract

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Keywords

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