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Abstract
The PADME experiment at the DAΦNE Beam-Test Facility (BTF) of the INFN Laboratory of Frascati is designed to search for invisible decays of dark sector particles produced in electron-positron annihilation events with a positron beam and a thin fixed target, by measuring the missing mass of single-photon final states. The presence of backgrounds originating from beam halo particles can significantly reduce the sensitivity of the experiment. To thoroughly understand the origin of the beam background contribution, a detailed Geant4-based Monte Carlo simulation has been developed, containing a full description of the detector together with the beam line and its optical elements. This simulation allows the full interactions of each particle to be described, both during beam line transport and during detection, a possibility which represents an innovative way to obtain reliable background predictions.
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1 INFN Laboratori Nazionali di Frascati, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000 0004 0648 0236)
2 INFN sez. Roma 3, Roma, Italy (GRID:grid.6045.7) (ISNI:0000 0004 1757 5281)
3 DISAT Politecnico di Torino and INFN sez. Torino, Torino, Italy (GRID:grid.4800.c) (ISNI:0000 0004 1937 0343)
4 Dip. Mat. e Fisica Salento Univ., Lecce, Italy (GRID:grid.9906.6) (ISNI:0000 0001 2289 7785); INFN sez. Lecce, Lecce, Italy (GRID:grid.9906.6)
5 INFN sez. Lecce, Lecce, Italy (GRID:grid.9906.6)
6 INFN sez. Roma 1, Rome, Italy (GRID:grid.6045.7) (ISNI:0000 0004 1757 5281)
7 ENEA Frascati, Frascati, Italy (GRID:grid.6045.7); Princeton Univ., Physics Dept., Princeton, USA (GRID:grid.16750.35) (ISNI:0000 0001 2097 5006)
8 Princeton Univ., Physics Dept., Princeton, USA (GRID:grid.16750.35) (ISNI:0000 0001 2097 5006)
9 INRNE Bulgarian Accademy of Science, Sofia, Bulgaria (GRID:grid.425050.6) (ISNI:0000 0004 0519 4756); Faculty of Physics, Sofia Univ. “St. Kl. Ohridski”, Sofia, Bulgaria (GRID:grid.11355.33) (ISNI:0000 0001 2192 3275)
10 Faculty of Physics, Sofia Univ. “St. Kl. Ohridski”, Sofia, Bulgaria (GRID:grid.11355.33) (ISNI:0000 0001 2192 3275)
11 Faculty of Physics, Sofia Univ. “St. Kl. Ohridski”, Sofia, Bulgaria (GRID:grid.11355.33) (ISNI:0000 0001 2192 3275); INFN Laboratori Nazionali di Frascati, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000 0004 0648 0236)
12 Dip. di Fisica Sapienza Univ., Rome, Italy (GRID:grid.7841.a)