HadroTOPS: A Monte Carlo Event Generator For Hadron Production In Two-Photon Scattering In Electron Positron Collisions

Abstract

We present a Monte Carlo event generator specifically developed for the study of hadronic two-photon fusion events in two-photon scattering at electron-positron colliders. The code enables the generation of events with exact leading-order QED coupling and a flat phase space decay of the hadronic state into an arbitrary number of final state particles as selected by the user. Thus, this generator is well-suited for the use of partial wave analyses tools to study the two-photon production of higher-multiplicity final states across a wide range of energies and photon virtualities. Furthermore, the code integrates both experimental and theoretical inputs on the two-photon couplings of hadrons to simulate two-photon production processes. Motivated by the investigations of the BESIII collaboration, the final states ${\pi }^{+}{\pi }^{-}$, ${\pi }^0{\pi }^0$, ${\pi }^0\eta$, $K^{+}{K}^{-}$, $K_S^0{K}_S^0$, $\eta \eta$, and $f_1(1285)\to \eta {\pi }^{+}{\pi }^{-}$ via $a_0^{\pm }(980){\pi }^{\mp }$ and $f_0(500)\eta$ are currently included. The code is sufficiently flexible to easily add additional final states as well as quickly change the already included channels.