Feasibility of studying the $K_0^{\ast }\left(700\right)$ resonance using ${\pi }^{\pm }{K}_S^0$ femtoscopy

The feasibility of using ${\pi }^{\pm }{K}_S^0$ femtoscopy to experimentally study the $K_0^{\ast }\left(700\right)$ resonance is considered. The $K_0^{\ast }\left(700\right)$ resonance is challenging to study due to its broad width and proximity in mass to the $K^{\ast }\left(892\right)$, both of which predominantly decay via the πK channel. One of the main interests in the $K_0^{\ast }\left(700\right)$ is that it is considered a candidate for a tetraquark state. It is proposed to use two-particle femtoscopic methods with ${\pi }^{\pm }{K}_S^0$ pairs produced in proton–proton and heavy ion collisions assuming a strong final-state interaction between them due to elastic scattering and/or via the $K_0^{\ast }\left(700\right)$ resonance. Calculations of ${\pi }^{\pm }{K}_S^0$ correlation functions are made to estimate the strength of these final-state interactions and to see if this signal can be adequately separated from the $K^{\ast }\left(892\right)$ background. A possible signature of diquark versus tetraquark behavior of the $K_0^{\ast }\left(700\right)$ final-state interaction is also discussed. (paper)