Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in <math display="inline"><mrow><mi>p</mi><mtext>-</mtext><mi>Pb</mi></mrow></math> Collisions - INSPIRE

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

LHCb

Collaboration

Apr 22, 2022

14 pages

Published in:

Phys.Rev.Lett. 131 (2023) 4, 042302

Published: Jul 24, 2023

e-Print:

2204.10608 [nucl-ex]

DOI:

10.1103/PhysRevLett.131.042302 (publication)

Report number:

LHCb-PAPER-2021-053,
CERN-EP-2022-050

Experiments:

CERN-LHC-LHCb

View in:

reference search28 citations

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Abstract: (APS)

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 < p_{T} < 10.0 GeV

and in center-of-mass pseudorapidity (

η_{c . m .}

) regions

2.5 < η_{c . m .} < 3.5

(forward) and

- 4.0 < η_{c . m .} < - 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.

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)

cross section: measured
p: beam
numerical calculations
interpretation of experiments: LHC-B
interpretation of experiments: CERN LHC Coll

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