Studies of final state interactions via femtoscopy in ALICE

Abstract

Femtoscopy is a technique enabling measurements of the space-time characteristics of particle-emitting sources. However, the femtoscopic analysis is also sensitive to the interaction cross-section. In this paper we show the first preliminary measurements of ${\mathrm{K}}_{\mathrm{S}}^0{\mathrm{K}}^{\pm }$ correlation functions in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. These correlations originate from the final-state interactions which proceed through the $a_0(980)$ resonance only and can be employed to constrain its parameters. A similar approach can be applied to baryon pairs to extract the unknown interaction cross-sections for some (anti-)baryon-(anti-)baryon pairs. We show baryon--baryon and baryon--anti-baryon correlation functions of protons and lambdas, as well as discuss shortly the fitting method.

arXiv comment4 pages, 3 figures, proceedings from Strangeness in Quark Matter 2016 conference

References in corpus (5)

• Femtoscopy in Relativistic Heavy Ion Collisions: Two Decades of Progress
• Hypernuclear Physics for Neutron Stars
• Measurement of interaction between antiprotons
• Non-thermal p/pi ratio at LHC as a consequence of hadronic final state interactions
• K${}_s^0$K${}_s^0$ correlations in pp collisions at $\sqrt{s}=7$ TeV from the LHC ALICE experiment