Measuring KS 0K± interactions using pp collisions at √s=7 TeV

Acharya S., Acosta F., Adamová D., Adler A., Adolfsson J., Aggarwal M., ...More

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol.790, pp.22-34, 2019 (SCI-Expanded) identifier identifier


We present the first measurements of femtoscopic correlations between the KS 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 a0(980) resonance. The extracted kaon source radius and correlation strength parameters for KS 0K− are found to be equal within the experimental uncertainties to those for KS 0K+. 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 KS 0K± measurement in Pb–Pb collisions at sNN=2.76 TeV. Combined with the Pb–Pb results, our pp analysis is found to be compatible with the interpretation of the a0(980) having a tetraquark structure instead of that of a diquark.