Measurement of the Centrality Dependence of the Dijet Yield in <math display="inline"><mrow><mi>p</mi><mo>+</mo><mi>Pb</mi></mrow></math> Collisions at <math display="inline"><msqrt><msub><mi>s</mi><mrow><mi>NN</mi></mrow></msub></msqrt><mo>=</mo><mn>8.16</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> with the ATLAS Detector

Aad, Georges; Abbott, Braden Keim; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Acharya, Bobby Samir

doi:10.1103/PhysRevLett.132.102301

Measurement of the Centrality Dependence of the Dijet Yield in $p + Pb$ Collisions at $\sqrt{s_{NN}} = 8.16 TeV$ with the ATLAS Detector

ATLAS

Collaboration

Aug 31, 2023

30 pages

Published in:

Phys.Rev.Lett. 132 (2024) 10, 102301

Published: Mar 7, 2024

e-Print:

2309.00033 [nucl-ex]

DOI:

10.1103/PhysRevLett.132.102301 (publication)

Report number:

CERN-EP-2023-178

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (APS)

ATLAS measured the centrality dependence of the dijet yield using

165 {nb}^{- 1}

of

p + Pb

data collected at

\sqrt{s_{NN}} = 8.16 TeV

in 2016. The event centrality, which reflects the

p + Pb

impact parameter, is characterized by the total transverse energy registered in the Pb-going side of the forward calorimeter. The central-to-peripheral ratio of the scaled dijet yields,

R_{CP}

, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The

R_{CP}

shows a scaling with the Bjorken

x

of the parton originating from the proton,

x_{p}

, while no such trend is observed as a function of

x_{Pb}

. This analysis provides unique input to understanding the role of small proton spatial configurations in

p + Pb

collisions by covering parton momentum fractions from the valence region down to

x_{p} \sim 10^{- 3}

and

x_{Pb} \sim 4 \times 10^{- 4}

.

Note:

30 pages, author list starting on page 13, 4 figures, 0 tables, published by PRL. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2023-05/

dijet: yield
parton: scattering
parton: momentum
TeV
ATLAS
scaling
valence
p nucleus
hard scattering
kinematics

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Figures(9)

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