We present the first measurements of femtoscopic correlations between the K S 0 and K ± particles in pp collisions at s=7 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely via the a 0 (980) resonance. The extracted kaon source radius and correlation strength parameters for K S 0 K − are found to be equal within the experimental uncertainties to those for K S 0 K + . Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at s=7 TeV by ALICE and with a K S 0 K ± measurement in Pb–Pb collisions at s NN =2.76 TeV. Combined with the Pb–Pb results, our pp analysis is found to be compatible with the interpretation of the a 0 (980) having a tetraquark structure instead of that of a diquark.
|Original language||English (US)|
|Number of pages||13|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Mar 10 2019|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics