Journal Article Measuring K 0 S K ± interactions using Pb–Pb collisions at √sNN = 2 . 76 TeV

ALICE Collaboration  ,  Busch, O.  ,  Chujo, T.  ,  Esumi, S.  ,  Miake, Y.

774pp.64 - 77 , 2017-11 , Elsevier
We present the first ever measurements of femtoscopic correlations between the Kos and K± particles. The analysis was performed on the data from Pb–Pb collisions at √sNN=2.76 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the a0(980) resonance. The extracted kaon source radius and correlation strength parameters for K os K- are found to be equal within the experimental uncertainties to those for K os K+ . Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the ao resonance are tested. Our results are also compatible with the interpretation of the ao having a tetraquark structure instead of that of a diquark.

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