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

S. Acharya, H.A. Andrews, D. Evans, K.L. Graham, P.G. Jones, A. Jusko, M. Krivda, J. Kvapil, R. Lietava, O. Villalobos Baillie, E. Willsher, N. Zardoshti

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Abstract

We present the first measurements of femtoscopic correlations between the KS0 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 KS0K− are found to be equal within the experimental uncertainties to those for KS0K+. 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 KS0K± 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.
Original languageEnglish
Pages (from-to)22-34
Number of pages13
JournalPhysics Letters B
Volume790
Early online date18 Dec 2018
DOIs
Publication statusPublished - 10 Mar 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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