Jun 12 – 16, 2017
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Europe/Zurich timezone

K0s-Kch femtoscopy in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV and pp collisions at sqrt(s) = 7 TeV from the LHC ALICE experiment

Jun 14, 2017, 4:10 PM
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Nikhef Science Park 105 1098XG Amsterdam The Netherlands


Thomas Humanic (Ohio State University (US))


Femtoscopic correlations between K$^0_{\rm S}$ and K$^{\rm \pm}$ are studied for the first time. Unlike the case of identical-kaon pairs which have correlations from quantum statistics and, if charged, the Coulomb interaction, K$^0_{\rm S}$K$^{\rm \pm}$ correlations can only take place through a strong final-state interaction. Analyses were performed on data from Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV and pp collisions at $\sqrt{s}=7$ TeV measured by the ALICE experiment. The observed correlations are found to be consistent with final-state interactions proceeding via the a$_0$(980) resonance. The extracted radius and lambda parameters for K$^0_{\rm S}$K$^{\rm -}$ are found to be equal within the experimental uncertainties to those for K$^0_{\rm S}$K$^{\rm +}$ in each case. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, constraints are placed on the a$_0$(980) mass and coupling parameters. In addition, the results from the present study are used to address the question of the quark composition of the a$_0$(980) resonance, and suggest that it is a tetraquark state.

List of tracks Resonance decays at low, intermediate and at RHIC and LHC

Primary authors

Thomas Humanic (Ohio State University (US)) ALICE collaboration

Presentation materials