Dijet measurements in pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV

Results on dijet production in pPb collisions at $5.02$ TeV are discussed. The dijet momentum balance, azimuthal angle correlations, and pseudorapidity distributions are studied as a function of the transverse energy in the forward calorimeters ($\rm{E}_{T}^{\eta>4}$). The dijet transverse momentum ratio is insensitive to $\rm{E}_{T}^{\eta>4}$. The normalized $\eta_{\rm{dijet}}$ distributions from data and from calculations with EPS09 nuclear parton distribution function (nPDF) are in good agreement for an inclusive $\rm{E}_{T}^{\eta>4}$ selection. As $\rm{E}_{T}^{eta>4}$ increases $\eta_{\rm{dijet}}$ distribution shifts towards lead beam direction an amount that is larger than what would be expected from the impact parameter dependence of nPDFs. To understand the driving mechanism of this shift an additional measurement of $\langle\eta_{\rm{dijet}}\rangle $ as a function of forward activity in the lead direction is carried out in differential bins of forward activity in the proton direction. The shift is reduced by keeping forward activity in the proton direction in a narrow interval.