Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02$$ $$\,\text {TeV}$$

Journal Article · Wed Jul 23 00:00:00 EDT 2014 · European Physical Journal. C, Particles and Fields

DOI: https://doi.org/10.1140/epjc/s10052-014-2951-y · OSTI ID:1151717

Chatrchyan, Serguei ^[1]

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1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.

Dijet production has been measured in pPb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. A data sample corresponding to an integrated luminosity of 35 inverse-nanobarns was collected using the Compact Muon Solenoid detector at the Large Hadron Collider. The dijet transverse momentum balance, azimuthal angle correlations, and pseudorapidity distributions are studied as a function of the transverse energy in the forward calorimeters ($$E_T^{4\lt |\eta| \lt 5.2}$$). For pPb collisions, the dijet transverse momentum ratio and the width of the distribution of dijet azimuthal angle difference are comparable to the same quantities obtained from a simulated pp reference and insensitive to $$E_T^{4\lt |\eta| \lt 5.2}$$. In contrast, the mean value of the dijet pseudorapidity is found to change monotonically with increasing $$E_T^{4\lt |\eta| \lt 5.2}$$, indicating a correlation between the energy emitted at large pseudorapidity and the longitudinal motion of the dijet frame. As a result, the pseudorapidity distribution of the dijet system is compared with next-to-leading-order perturbative QCD predictions obtained from both nucleon and nuclear parton distribution functions, and the data more closely match the latter.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: The CMS Collaboration
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1151717
• Report Number(s): FERMILAB-PUB--14-083-CMS; arXiv eprint number arXiv:1401.4433
• Journal Information: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 7 Vol. 74; ISSN 1434-6044
• Publisher: SpringerCopyright Statement
• Country of Publication: United States
• Language: English