International Workshop on e⁺e⁻ collisions from Phi to Psi 2017

Theoretical Description of the Invariant Mass Distribution of the decay $Y(4260) \to J/ \psi \; \pi^{+} \pi^{-}$

27 Jun 2017, 18:30

1h 30m

Helmholtz-Institut Mainz

Board: 13

Poster Poster Session

Speaker

Mr Daniel Molnar (JGU Mainz)

Description

In this work, we aim to provide a physical description of the recent BESIII data on the exotic meson decay, $ Y(4260) \to J/ \psi \; \pi^{+} \pi^{-}$. In the $\psi \pi$ invariant mass distribution, one can observe two peaks, which correspond to the exotic meson $Z_c(3900)$ and its kinematic reflection. Its shape can be parameterized as a S-wave Breit-Wigner and a background, which comes from the final state interactions of two pions. The latter we implement using unitarity and analyticity constraints. In result, a simultaneous description of $\psi \pi$ and $\pi \pi$ invariant mass distributions is achieved.