Femtoscopic measurements in $p$+Pb collisions at   $\sqrt{s_{_{\text{NN}}}}= 5.02$~TeV with ATLAS at the LHC
  Recent measurements in two-particle correlations in $p$+Pb collisions suggest collective behavior reminiscent of that observed in Pb+Pb. Femtoscopic measurements may provide useful insight on this behavior because they image the spatio-temporal size of the particle emitting region. This proceeding presents identical-pion Hanbury Brown and Twiss (HBT) measurements from ATLAS using one- and three-dimensional correlation functions. Pions are identified using $\text{d}E/\text{d}x$ measured in the pixel detector. Correlation functions and the resulting HBT radii are shown as a function of pair momentum ($k_{\rm T}$) and collision centrality. 
Markus K. Koehler (for the ATLAS Collaboration)
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