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arXiv · 2010.04033

Pulse Shape Discrimination in CUPID-Mo using Principal Component Analysis

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

CUPID-Mo is a cryogenic detector array designed to search for neutrinoless double-beta decay ($0\nu\beta\beta$) of $^{100}$Mo. It uses 20 scintillating $^{100}$Mo-enriched Li$_2$MoO$_4$ bolometers instrumented with Ge light detectors to perform active suppression of $\alpha$ backgrounds, drastically reducing the expected background in the $0\nu\beta\beta$ 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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R. Huang, E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoît, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, Ch. Bourgeois, V. B. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F. A. Danevich, M. De Jesus, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, E. Guerard, D. L. Helis, H. Z. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, R. Mariam, L. Marini, S. Marnieros, D. Misiak, X. -F. Navick, C. Nones, E. Olivieri, J. L. Ouellet, L. Pagnanini, P. Pari, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, E. Previtali, Th. Redon, S. Rozov, C. Rusconi, V. Sanglard, J. A. Scarpaci, K. Schäffner, B. Schmidt, Y. Shen, V. N. Shlegel, B. Siebenborn, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, M. Weber, B. Welliver, L. Winslow, M. Xue, E. Yakushev, M. M. Zarytskyy, A. S. Zolotarova. 2020-10-08. Pulse Shape Discrimination in CUPID-Mo using Principal Component Analysis. https://doi.org/10.1088/1748-0221/16/03/p03032

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