We present the first ever measurements of femtoscopic correlations between the K0 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 K0S K− are found to be equal within the experimental uncertainties to those for K0 K+ . Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the a0 resonance are tested. Our results are also compatible with the interpretation of the a0 having a tetraquark structure instead of that of a diquark.

Measuring KS0-K± interactions using Pb-Pb collisions at √sNN = 2.76 TeV

Camerini, P.;Fragiacomo, E.;Lea, R.;Luparello, G.;Margagliotti, G. V.;Piano, S.;Rui, R.;Suljic, M.;Zaccolo, V.;
2017-01-01

Abstract

We present the first ever measurements of femtoscopic correlations between the K0 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 K0S K− are found to be equal within the experimental uncertainties to those for K0 K+ . Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the a0 resonance are tested. Our results are also compatible with the interpretation of the a0 having a tetraquark structure instead of that of a diquark.
2017
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https://www.sciencedirect.com/science/article/pii/S0370269317307074
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2916126
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