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 (EHF[∣∣η∣∣>4]T). 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 EHF[∣∣η∣∣>4]T. In contrast, the mean value of the dijet pseudorapidity is found to change monotonically with increasing EHF[∣∣η∣∣>4]T, indicating a correlation between the energy emitted at large pseudorapidity and the longitudinal motion of the dijet frame. 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.

Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at sqrt(s[NN]) = 5.02 TeV

CAVALLO, Nicola;FABOZZI, FRANCESCO;
2014

Abstract

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 (EHF[∣∣η∣∣>4]T). 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 EHF[∣∣η∣∣>4]T. In contrast, the mean value of the dijet pseudorapidity is found to change monotonically with increasing EHF[∣∣η∣∣>4]T, indicating a correlation between the energy emitted at large pseudorapidity and the longitudinal motion of the dijet frame. 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/94918
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