Studies of dijet pseudorapidity distributions and transverse momentum balance in pPb collisions at $\sqrt{{s}_{NN}} =$ 5.02 TeV

Dijet production has been measured in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. A data sample corresponding to an integrated luminosity of 35 nb−1 was collected using the Compact Muon Solenoid detector at the Large Hadron Collider. The dijet transverse momentum balance and pseudorapidity distributions are studied as a function of the transverse energy in the forward calorimeters ( ETHF[|η|>4] ). For pPb collisions, the dijet transverse momentum ratio is comparable to the same quantities obtained from a simulated pp reference and insensitive to ETHF[|η|>4] . In contrast, the distribution of the dijet pseudorapidity is changing with increasing ETHF[|η|>4] , indicating a correlation between the energy emitted at large pseudorapidity and the longitudinal motion of the dijet frame. The observed pseudorapidity distribution of the dijet system in minimum bias pPb collisions is consistent with next-to-leading-order perturbative QCD predictions from nuclear parton distribution functions.