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1. The PADME detector

Author

Georgi P. Georgiev, Emilio Leonardi, D. Domenici, G. Finocchiaro, I. Sarra, Bruno Buonomo, C. Taruggi, F. Ferrarotto, Felice Iazzi, V. Capirossi, J. Alexander, Barbara Liberti, Stefania Spagnolo, S. Fiore, Tommaso Spadaro, Maurizio Martino, F. Bossi, P. Gianotti, R. de Sangro, G. Piperno, F. Giacchino, E. Vilucchi, F. Safai Tehrani, I. Oceano, Andre Frankenthal, Giovanni Organtini, M. Garattini, Federico Pinna, Anna Paola Caricato, Paolo Valente, Luca Gennaro Foggetta, F. Oliva, E. Spiriti, Barbara Sciascia, M. Martini, S. Ivanov, V. Kozhuharov, R. Simeonov, E. Long, Mauro Raggi, A. Ghigo, C. Di Giulio, Alexander, J., Bossi, F., Buonomo, B., Capirossi, V., Caricato, A. P., De Sangro, R., Di Giulio, C., Domenici, D., Ferrarotto, F., Finocchiaro, G., Fiore, S., Foggetta, L. G., Frankenthal, A., Garattini, M., Georgiev, G., Ghigo, A., Giacchino, F., Gianotti, P., Iazzi, F., Ivanov, S., Kozhuharov, V., Leonardi, E., Liberti, B., Long, E., Martini, M., Martino, M., Oceano, I., Oliva, F., Organtini, G. C., Pinna, F., Piperno, G., Raggi, M., Safai Tehrani, F., Sarra, I., Sciascia, B., Simeonov, R., Spadaro, T., Spagnolo, S., Spiriti, E., Valente, P., Vilucchi, E., Taruggi, C., Alexander, J, Bossi, F, Buonomo, B, Capirossi, V, Caricato, A P, De Sangro, R, Di Giulio, C, Domenici, D, Ferrarotto, F, Finocchiaro, G, Fiore, S, Foggetta, L G, Frankenthal, A, Garattini, M, Georgiev, G, Ghigo, A, Giacchino, F, Gianotti, P, Iazzi, F, Ivanov, S, Kozhuharov, V, Leonardi, E, Liberti, B, Long, E, Martini, M, Martino, M, Oceano, I, Oliva, F, Organtini, G C, Pinna, F, Piperno, G, Raggi, M, Safai Tehrani, F, Sarra, I, Sciascia, B, Simeonov, R, Spadaro, T, Spagnolo, S, Spiriti, E, Valente, P, Vilucchi, E, and Taruggi, C

Subjects
Physics, Range (particle radiation), Photon, Spectrometer, detector, Physics::Instrumentation and Detectors, Detector, PADME, detector, dark matter, PADME, dark matter, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Dark photon, Charged particle, Dark Photon, dark sector, PADME, Momentum, Nuclear physics, Dipole magnet, Physics::Accelerator Physics, Nuclear Experiment, Mathematical Physics
Abstract

To search for the production of a dark photon ($A^{\prime} $) in the process ${e}^{+}{e}^{-}\to A^{\prime} \gamma $, the PADME apparatus has been built athe INFN Laboratori Nazionali di Frascati. It is a small-scale detector consisting of an active target, a beam monitor system, a spectrometer to measure charged particle momenta in the range 50–400 MeV, a dipole magnet to deflect the primary positron beam out of the spectrometer and allow charged particle momentum analysis and an electromagnetic calorimetric system to detect signal and background photons produced in the annihilations with high accuracy. Each element has specific requirements that are stringent and sometimes at the limit of present technology. This proceeding will give an overview of each component and a description of the technical solutions implemented to accomplish the experiment needs. Results of the commissioning data taking, performed from October 2018 to February 2019, will be illustrated.

Published
2021

2. Characterization and Performance of PADME's Cherenkov-Based Small-Angle Calorimeter

Author

F. Ferrarotto, J. Alexander, P. Gianotti, G. Piperno, C. Cesarotti, C. Rella, R. de Sangro, I. Sarra, M.D. Hunyadi, Georgi P. Georgiev, A. Saputi, C. Capoccia, Mauro Raggi, Emilio Leonardi, Bruno Buonomo, C. Di Giulio, E. Spiriti, Luca Gennaro Foggetta, A. Krasznahorkay, Paolo Valente, E. Capitolo, Giovanni Organtini, C. Taruggi, Andre Frankenthal, and V. Kozhuharov

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Resolution (electron density), Detector, Dark matter, Cherenkov detectors, FOS: Physical sciences, Dark photon, Electron, Instrumentation and Detectors (physics.ins-det), Calorimeter, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Ultra fast calorimeter, Cherenkov detectors, Dark matter, Dark photon, PbF2 crystals, Ultra fast calorimeter, PbF2 crystals, Instrumentation, Cherenkov radiation
Abstract

The PADME experiment, at the Laboratori Nazionali di Frascati (LNF), in Italy, will search for invisible decays of the hypothetical dark photon via the process $e^+e^-\rightarrow \gamma A'$, where the $A'$ escapes detection. The dark photon mass range sensitivity in a first phase will be 1 to 24 MeV. We report here on measurement and simulation studies of the performance of the Small-Angle Calorimeter, a component of PADME's detector dedicated to rejecting 2- and 3-gamma backgrounds. The crucial requirement is a timing resolution of less than 200 ps, which is satisfied by the choice of PbF$_2$ crystals and the newly released Hamamatsu R13478UV photomultiplier tubes (PMTs). We find a timing resolution of 81 ps (with double-peak separation resolution of 1.8 ns) and a single-crystal energy resolution of 5.7%/$\sqrt{E}$ with light yield of 2.07 photo-electrons per MeV, using 100 to 400 MeV electrons at the Beam Test Facility of LNF. We also propose the investigation of a two-PMT solution coupled to a single PbF$_2$ crystal for higher-energy applications, which has potentially attractive features., Comment: 12 pages, 19 figures. v2: added section on radiation damage studies

Published
2018

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