We present the first measurements of femtoscopic correlations between the K0S and K± particles in pp collisions at √s=7TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely 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 K0S K+. Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at √s=7TeV by ALICE and with a K0S K± measurement in Pb–Pb collisions at √sNN=2.76 TeV. Combined with the Pb–Pb results, our pp analysis is found to becompatible with the interpretation of the a0(980) having a tetraquark structure instead of that of a diquark.

Measuring KS0K± interactions using pp collisions at √s=7 TeV

Cortese P.;Ramello L.;Sitta M.;
2019-01-01

Abstract

We present the first measurements of femtoscopic correlations between the K0S and K± particles in pp collisions at √s=7TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely 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 K0S K+. Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at √s=7TeV by ALICE and with a K0S K± measurement in Pb–Pb collisions at √sNN=2.76 TeV. Combined with the Pb–Pb results, our pp analysis is found to becompatible with the interpretation of the a0(980) having a tetraquark structure instead of that of a diquark.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11579/104518
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