TY - JOUR

T1 - NGAMMA: A Monte Carlo generator for multiphoton production in e+e− annihilation

AU - Kardapoltsev, L. V.

AU - Melnikova, N. A.

PY - 2025/12

Y1 - 2025/12

N2 - 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. Program summary: Program Title: NGAMMA CPC Library link to program files: https://doi.org/10.17632/rj9ntc7tzn.1 Developer's repository link: https://git.inp.nsk.su/ngamma/ngamma Licensing provisions: LGPL Programming language: C++ Nature of problem: The NGAMMA generator was developed to simulate the background for e+e−→hadrons processes with a multiphoton final state coming from the QED processes e+e−→Nγ(N≥2). Solution method: Events consisting of momenta of the outgoing particles are generated by Monte Carlo methods. The generated events are distributed according to the exact tree-level cross section [1]. References: [1] R. Kleiss, W.J. Stirling, Phys. Lett. B 179 (1986) 159–163.

AB - 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. Program summary: Program Title: NGAMMA CPC Library link to program files: https://doi.org/10.17632/rj9ntc7tzn.1 Developer's repository link: https://git.inp.nsk.su/ngamma/ngamma Licensing provisions: LGPL Programming language: C++ Nature of problem: The NGAMMA generator was developed to simulate the background for e+e−→hadrons processes with a multiphoton final state coming from the QED processes e+e−→Nγ(N≥2). Solution method: Events consisting of momenta of the outgoing particles are generated by Monte Carlo methods. The generated events are distributed according to the exact tree-level cross section [1]. References: [1] R. Kleiss, W.J. Stirling, Phys. Lett. B 179 (1986) 159–163.

KW - Monte Carlo generator

KW - QED

KW - e+e− annihilation

UR - https://www.scopus.com/pages/publications/105014797978

UR - https://www.mendeley.com/catalogue/ed32eef3-9c99-3e36-9bd0-2f744baa2e05/

U2 - 10.1016/j.cpc.2025.109826

DO - 10.1016/j.cpc.2025.109826

M3 - Article

VL - 317

JO - Computer Physics Communications

JF - Computer Physics Communications

SN - 0010-4655

M1 - 109826

ER -