Measuring KS0K± interactions using pp collisions at √s = 7 TeV
ALICE Collaboration. (2019). Measuring KS0K± interactions using pp collisions at √s = 7 TeV. Physics Letters B, 790, 22-34. doi:10.1016/j.physletb.2018.12.033
Published inPhysics Letters B
Rak, Jan |
© 2018 Published by Elsevier B.V.
We present the first measurements of femtoscopic correlations between the K0 S 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 K0 SK− are found to be equal within the experimental uncertainties to those for K0 SK+. 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 K0 SK± 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.