HadroTOPS: A Monte Carlo event generator for hadron production in two-photon scattering in electron positron collisions
Description
We present a Monte Carlo event generator specifically developed for the study of hadronic two-photon scattering 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 π^{+}π^{-}, π^{0}π^{0}, π^{0}η, K^{+}K^{-}, K^{0}_{S}K^{0}_{S}, ηη, and f_1(1285) → ηπ^{+}π^{-} via a^{±}_{0}(980)π^{∓} and f_{0}(500)η are currently included. The code is sufficiently flexible to easily add additional final states as well as quickly change the already included channels.