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We present a systematic study of charged pion and kaon interferometry inAu$+$Au collisions at $\sqrt{s_{_{NN}}}$=200 GeV. The kaon mean source radiiare found to be larger than pion radii in the outward and longitudinaldirections for the same transverse mass; this difference increases for morecentral collisions. The azimuthal-angle dependence of the radii was measuredwith respect to the second-order event plane and similar oscillations of thesource radii were found for pions and kaons. Hydrodynamic models qualitativelydescribe the similar oscillations of the mean source radii for pions and kaons,but they do not fully describe the transverse-mass dependence of theoscillations.

Systematic study of charged-pion and kaon femtoscopy in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$=200 GeV