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Multidimensional two-particle Bose-Einstein correlation functions of chargedhadrons are reported for pp collisions at 2.76 and 7 TeV in terms of differentcomponents of the pair relative momentum, extending the previousone-dimensional (1-D) analyses of CMS. This allows for investigating theextension of the source accessible to the femtoscopic correlation technique indifferent directions, revealing a more detailed picture of the emitting sourcein these collisions at increasing energies. The measurements are performed fordifferent intervals of the pair average transverse momentum, kT, and forincreasing charged particle multiplicitiy, Nch. Results in 1-D, 2-D and 3-Dshow a decrease of the fit radius parameters with kT, whereas a clear rise withNch is observed in all cases. In addition, the fit radius parameters at bothenergies show close similarity in size and behavior within the same intervalsof (Nch,kT).

Multidimensional analysis of Bose-Einstein correlations in pp collisions at 2.76 and 7 TeV in CMS