Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8166150 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2018 | 6 Pages |
Abstract
The PADME experiment at the DAΦNE Beam-Test Facility (BTF) is designed to search for the gauge boson of a new U(1) interaction in the process e+eââγ+Aâ², using the intense positron beam hitting a light target. The Aâ², usually referred as a dark photon, is assumed to decay into invisible particles of a secluded sector and it can be observed by searching for an anomalous peak in the spectrum of the missing mass measured in events with a single photon in the final state. The measurement requires the determination of the 4-momentum of the recoil photon, performed by a homogeneous, highly segmented BGO crystals calorimeter. A significant improvement of the missing mass resolution is possible using an active target capable of determining the average position of the positron pulse with a resolution of less than 1 mm. This report presents the performance of a real size (2 Ã 2 cm2) PADME active target made of a thin (50 μm) diamond sensor, with graphitic strips produced via laser irradiation on both sides. The measurements are based on data collected in a beam test at the BTF in November 2015.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
R. Assiro, A.P. Caricato, G. Chiodini, M. Corrado, M. De Feudis, C. Di Giulio, G. Fiore, L. Foggetta, E. Leonardi, M. Martino, G. Maruccio, A.G. Monteduro, F. Oliva, C. Pinto, S. Spagnolo,