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Pulse shape discrimination in CUPID-Mo using principal component analysis

  • 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
  • And 70 more
Publication Date
Mar 01, 2021
eScholarship - University of California
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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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