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Pulse shape discrimination in CUPID-Mo using principal component analysis

  • Author(s): Huang, R
  • Armengaud, E
  • Augier, C
  • Barabash, AS
  • Bellini, F
  • Benato, G
  • Beno t, A
  • Beretta, M
  • Bergé, L
  • Billard, J
  • Borovlev, YA
  • Bourgeois, C
  • Brudanin, VB
  • Camus, P
  • Cardani, L
  • Casali, N
  • Cazes, A
  • Chapellier, M
  • Charlieux, F
  • De Combarieu, M
  • Dafinei, I
  • Danevich, FA
  • De Jesus, M
  • Dixon, T
  • Dumoulin, L
  • Eitel, K
  • Ferri, F
  • Fujikawa, BK
  • Gascon, J
  • Gironi, L
  • Giuliani, A
  • Grigorieva, VD
  • Gros, M
  • Guerard, E
  • Helis, DL
  • Huang, HZ
  • Johnston, J
  • Juillard, A
  • Khalife, H
  • Kleifges, M
  • Kobychev, VV
  • Kolomensky, YG
  • Konovalov, SI
  • Loaiza, P
  • Ma, L
  • Makarov, EP
  • De Marcillac, P
  • Mariam, R
  • Marini, L
  • Marnieros, S
  • Misiak, D
  • Navick, XF
  • Nones, C
  • Norman, EB
  • Olivieri, E
  • Ouellet, JL
  • Pagnanini, L
  • Pari, P
  • Pattavina, L
  • Paul, B
  • Pavan, M
  • Peng, H
  • Pessina, G
  • Pirro, S
  • Poda, DV
  • Polischuk, OG
  • Previtali, E
  • Redon, T
  • Rozov, S
  • Rusconi, C
  • Sanglard, V
  • Scarpaci, JA
  • Sch ffner, K
  • Schmidt, B
  • Shen, Y
  • Shlegel, VN
  • Siebenborn, B
  • Singh, V
  • Tomei, C
  • Tretyak, VI
  • Umatov, VI
  • Vagneron, L
  • Velázquez, M
  • Weber, M
  • Welliver, B
  • Winslow, L
  • Xue, M
  • Yakushev, E
  • Zarytskyy, MM
  • Zolotarova, AS
  • et al.
Abstract

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.

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