[en] Here, measurements of dijet correlations in Pb + Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of √s_NN = 2.76TeV are presented. The measurements are performed with the ATLAS detector at the Large Hadron Collider using Pb + Pb and pp data samples corresponding to integrated luminosities of 0.14nb^–1 and 4.0pb^–1, respectively. Jets are reconstructed using the anti-κ_t algorithm with radius parameter values R = 0.3 and R = 0.4. A background subtraction procedure is applied to correct the jets for the large underlying event present in Pb + Pb collisions. The leading and sub-leading jet transverse momenta are denoted p_T1 and p_T2. An unfolding procedure is applied to the two-dimensional ( p_T1, p_T2) distributions to account for experimental effects in the measurement of both jets.