Performance of the PADME calorimeter prototype at the DA$\Phi$NE BTF
2016
The PADME experiment at the DA$\Phi$NE Beam-Test Facility (BTF) aims at searching for invisible decays of the
dark photonby measuring the final state missing mass in the process $e^+e^- \to \gamma+ A'$, with $A'$ undetected. The measurement requires the determination of the 4-momentum of the
recoilphoton, performed using a homogeneous, highly segmented BGO crystals
calorimeter. We report the results of the test of a 5$\times$5 crystals prototype performed with an electron beam at the BTF in July 2016.
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