Femtoscopy in $\sqrt{s_\mathrm{NN}} = 5$ Tev $p$+Pb collisions with ATLAS

Bose-Einstein correlations between identified charged pions are measured for $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02 TeV with the ATLAS detector with a total integrated luminosity of 28 $\mathrm{nb}^{−1}$. Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted three-dimensional source radii are presented as a function of average transverse pair momentum ($k_\mathrm{T}$) and rapidity ($y^\star_{\pi\pi}$) as well as collision centrality. Pairs are selected with a rapidity $−2 < y^{\star}_{\pi\pi} < 1$ and with an average transverse momentum 0.1<$k_\mathrm{T}$