TL;DR
Initial State Radiation (ISR) has become a crucial experimental tool in low and intermediate energy hadron physics, enabling precise measurements and discoveries through advanced Monte Carlo simulations like EVA-PHOKHARA.
Contribution
The paper reviews the development and success of ISR as a tool in hadron physics, highlighting the role of the EVA-PHOKHARA Monte Carlo generator in its recent advancements.
Findings
ISR enables measurement of hadronic cross sections from threshold to collider energy
EVA-PHOKHARA is a user-friendly, flexible Monte Carlo generator for ISR studies
ISR has facilitated discovery of new mesonic states and understanding of reaction mechanisms
Abstract
The investigation of events with Initial State Radiation (ISR) and subsequent Radiative Return has become an impressively successful and guiding tool in low and intermediate energy hadron physics with electron positron colliders: it allows to measure hadronic cross sections and the ratio R from threshold up to the maximum energy of the colliders running at fixed energy, to clarify reaction mechanisms and reveal substructures (intermediate states and their decay mechanisms) and to search for new highly excited mesonic states with J^{PC} = 1^{--}. While being discussed since the sixties-seventies ISR became a powerful tool for experimentalists only with the development of EVA-PHOKHARA, a Monte Carlo generator developed over almost 10 years, while increasing its complexity, which is user friendly, flexible and easy to implement into the software of existing detectors.
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