Measurement of the Centrality Dependence of the Dijet Yield in p plus Pb Collisions at √s<sub>NN</sub>=8.16 TeV with the ATLAS Detector


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Filmer E., Grant C., Jackson P., Kong A., Pandya H., Potti H., ...More

PHYSICAL REVIEW LETTERS, no.10, 2024 (SCI-Expanded) identifier identifier identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2024
  • Doi Number: 10.1103/physrevlett.132.102301
  • Journal Name: PHYSICAL REVIEW LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, DIALNET
  • Ankara University Affiliated: Yes

Abstract

ATLAS measured the centrality dependence of the dijet yield using 165 nb-1 of p + Pb data collected at p 1/4 8.16 TeV in 2016. The event centrality, which reflects the p + Pb impact parameter, is ffiffiffiffiffiffiffi sNN 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, RCP, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The RCP shows a scaling with the Bjorken x of the parton originating from the proton, xp, while no such trend is observed as a function of xPb. 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 xp similar to 10-3 and xPb similar to 4 x 10-4.