Ferrarotto, F. (2025) Searching for the X17 with the PADME experiment. Il nuovo cimento C, 48 (1). pp. 1-9. ISSN 1826-9885
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Abstract
Certain classes of dark matter theories predict the existence of a new, hidden “Dark Sector” of particles which interact with Standard Model particles only through the exchange of a new, massive mediator. This is the scenario that the Positron Annihilation into Dark Matter Experiment (PADME) was originally designed to test using the positron beam at the Beam Test Facility (BTF) at the INFN Laboratori Nazionali di Frascati (LNF). The confirmation of the X17 anomaly in 2021, observed in internal pair creation nuclear decays at the ATOMKI institute in Debrecen, Hungary, kindled significant interest within the particle physics community. Assuming that the anomaly comes from the decay of a new particle to an e+e− pair, time-reversal symmetry implies that the new particle must be producible in e+e− annihilation. Since the beam used at PADME is the only one worldwide with the correct energy to create this new particle on resonance, the PADME collaboration pivoted to study the X17 anomaly in the reaction e+e− → X17 → e+e−, aiming to confirm/disprove the particle hypothesis. In 2022, PADME Run III was dedicated specifically to this search. Approximately 1010 positrons on target were collected for each of the 47 beam energy values in the range 262 ÷ 298 MeV. This paper gives an overview of the scientific program of the experiment and of the data analyses ongoing.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 24 Mar 2025 15:23 |
| Last Modified: | 24 Mar 2025 15:23 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23509 |
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