NGAMMA: A Monte Carlo generator for multiphoton production in e⁺e^- annihilation

2025/03/12 by Kardapoltsev, L. V., Melnikova, N. A.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2503.09118

Abstract

We present the NGAMMA Monte Carlo event generator for QED processes of e⁺e^- annihilation into a multiphoton final state, e⁺e^-→ Nγ(N ≥ 2). These processes are an important source of background in the study of e⁺e^-→ hadrons processes with a multiphoton final state, especially for experiments at low energy e⁺e^- colliders like SND, CMD-3, KLOE and for the BESIII experiment. For generation, NGAMMA exploits the exact tree-level amplitude.

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