Pulse shape discrimination in CUPID-Mo using principal component analysis

Huang, R.; Armengaud, E.; Augier, C.; Barabash, A. S.; Bellini, F.; Benato, G.; Beno T, A.; Beretta, M.; Berge, L.; Billard, J.; Borovlev, Yu. A.; Bourgeois, C.; Brudanin, V. B.; Camus, P.; Cardani, L.; Casali, N.; Cazes, A.; Chapellier, M.; Charlieux, F.; De Combarieu, M.; Dafinei, I.; Danevich, F. A.; De Jesus, M.; Dixon, T.; Dumoulin, L.; Eitel, K.; Ferri, F.; Fujikawa, B. K.; Gascon, J.; Gironi, L.; Giuliani, A.; Grigorieva, V. D.; Gros, M.; Guerard, E.; Helis, D. L.; Huang, H. Z.; Johnston, J.; Juillard, A.; Khalife, H.; Kleifges, M.; Kobychev, V. V.; Kolomensky, Yu. G.; Konovalov, S. I.; Loaiza, P.; Ma, L.; Makarov, E. P.; De Marcillac, P.; Mariam, R.; Marini, L.; Marnieros, S.; Misiak, D.; Navick, X. -F.; Nones, C.; Norman, E. B.; Olivieri, E.; Ouellet, J. L.; Pagnanini, L.; Pari, P.; Pattavina, L.; Paul, B.; Pavan, M.; Peng, H.; Pessina, G.; Pirro, S.; Poda, D. V.; Polischuk, O. G.; Previtali, E.; Redon, T.; Rozov, S.; Rusconi, C.; Sanglard, V.; Scarpaci, J. A.; Sch Ffner, K.; Schmidt, B.; Shen, Y.; Shlegel, V. N.; Siebenborn, B.; Singh, V.; Tomei, C.; Tretyak, V. I.; Umatov, V. I.; Vagneron, L.; Velazquez, M.; Weber, M.; Welliver, B.; Winslow, L.; Xue, M.; Yakushev, E.; Zarytskyy, M. M.; Zolotarova, A. S.

doi:10.1088/1748-0221/16/03/P03032

CUPID-Mo is a cryogenic detector array designed to search for neutrinoless double-beta decay (0νββ) of 100Mo. It uses 20 scintillating 100Mo-enriched Li2MoO4 bolometers instrumented with Ge light detectors to perform active suppression of α backgrounds, drastically reducing the expected background in the 0νββ signal region. As a result, pileup events and small detector instabilities that mimic normal signals become non-negligible potential backgrounds. These types of events can in principle be eliminated based on their signal shapes, which are different from those of regular bolometric pulses. We show that a purely data-driven principal component analysis based approach is able to filter out these anomalous events, without the aid of detector response simulations.

Pulse shape discrimination in CUPID-Mo using principal component analysis / Huang, R., Armengaud, E., Augier, C., Barabash, A.S., Bellini, F., Benato, G., Beno t, A., Beretta, M., Berge, L., Billard, J., Borovlev, Yu.A., Bourgeois, C., Brudanin, V.B., Camus, P., Cardani, L., Casali, N., Cazes, A., Chapellier, M., Charlieux, F., De Combarieu, M., et al.. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - 16:3(2021), p. P03032. [10.1088/1748-0221/16/03/P03032]