The Institute of Nuclear and Particle Physics (INPP) presents Thomas Humanic, of The Ohio State University, on “a<sub>o</sub>(980) Resonance Studies Via Kaon-Kaon Femtoscopy in Pb-Pb collisions at SQRT(SNN)=2.76 TEV from the ALICE Experiment” Tuesday, April 11, at at 4 p.m. in Edwards Accelerator Lab, Roger W. Finlay Conference Room.
Abstract: Femtoscopic correlations between K~ and K± are studied for the first time. Unlike the case of identical-kaon pairs which have correlations from quantum statistics and, if charged, the Coulomb interaction, K~K± correlations can only take place through a strong final-state interaction. Analyses were performed on data from Pb-Pb collisions at JSNN = 2.76 TeV and pp collisions at JS = 7 TeV measured by the ALICE experiment. The observed correlations are found to be consistent with final-state interactions proceeding via the ao(980) resonance. The extracted radius and lambda parameters for K~K- are found to be equal within the experimental uncertainties to those for K~K+ in each case. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, constraints are placed on the ao(980) mass and coupling parameters. In addition, the results from the present study are used to address the question of the quark composition of the ao(980) resonance, and suggest that it is a tetraquark state.