https://doi.org/10.1140/epjs/s11734-026-02315-w
Regular Article
Estimation of the inverse Compton scattering background in MeV Gamma–Gamma Collider
1
School of Science, Shenzhen Campus of Sun Yat-sen University, Gongchang Road 66, 518107, Shenzhen, Guangdong, China
2
INFN-Milan (Istituto Nazionale di Fisica Nucleare, Sezione di Milano), Via Celoria 16, 20133, Milan, Milan, Italy
a
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b
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Received:
21
October
2025
Accepted:
10
April
2026
Published online:
2
June
2026
Abstract
The MeV Gamma–Gamma Collider would provide a direct experimental platform for elastic light-by-light scattering (
) and the Breit–Wheeler process with two real photons (
). A Monte Carlo code, the Genie Background Evaluation Tool (GBET), has been developed to fully simulate two successive inverse Compton scatterings in the linear regime, including 
and 
. GBET overcomes the inherent information loss in traditional luminosity-spectrum-based chain simulations, preserving full particle-level information and achieving higher physical fidelity. The effectiveness of the code is verified by benchmarking against the simulation results of CAIN. GBET shows that the event rate of background photons generated by the first inverse Compton scattering is 
/s, with energies below 18 eV; the second inverse Compton scattering generates background electrons at 51.99/s and photons at 0.99/s, both with energies below 11 MeV. In addition, Møller scattering contributes background electrons at 0.56/s with energies around 200 MeV. The count rates of background electrons and positrons originating from the Breit–Wheeler process are 1312.2/s and 1314.3/s, respectively, with energy distributions ranging from 511 to 720 keV.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
