A likelihood framework for cryogenic scintillating calorimeters used in the CRESST dark matter search
Abstract
Cryogenic scintillating calorimeters are ultrasensitive particle detectors for rare event searches, particularly for the search for dark matter and the measurement of neutrino properties. These detectors are made from scintillating target crystals generating two signals for each particle interaction. The phonon (heat) signal precisely measures the deposited energy independent of the type of interacting particle. The scintillation light signal yields particle discrimination on an event-by-event basis. This paper presents a likelihood framework modeling backgrounds and a potential dark matter signal in the two-dimensional plane spanned by phonon and scintillation light energies. We apply the framework to data from CaWO-based detectors operated in the CRESST dark matter search. For the first time, a single likelihood framework is used in CRESST to model the data and extract results on dark matter in one step by using a profile likelihood ratio test. Our framework simultaneously fits (neutron) calibration data and physics (background) data and allows combining data from multiple detectors. Although tailored to CaWO-targets and the CRESST experiment, the framework can easily be expanded to other materials and experiments using scintillating cryogenic calorimeters for dark matter search and neutrino physics.
Keywords
Cite
@article{arxiv.2403.03824,
title = {A likelihood framework for cryogenic scintillating calorimeters used in the CRESST dark matter search},
author = {CRESST Collaboration and G. Angloher and S. Banik and G. Benato and A. Bento and A. Bertolini and R. Breier and C. Bucci and J. Burkhart and L. Canonica and A. D'Addabbo and S. Di Lorenzo and L. Einfalt and A. Erb and F. v. Feilitzsch and S. Fichtinger and D. Fuchs and A. Garai and V. M. Ghete and P. Gorla and P. V. Guillaumon and S. Gupta and D. Hauff and M. Ješkovský and J. Jochum and M. Kaznacheeva and A. Kinast and H. Kluck and H. Kraus and S. Kuckuk and A. Langenkämper and M. Mancuso and L. Marini and B. Mauri and L. Meyer and V. Mokina and M. Olmi and T. Ortmann and C. Pagliarone and L. Pattavina and F. Petricca and W. Potzel and P. Povinec and F. Pröbst and F. Pucci and F. Reindl and J. Rothe and K. Schäffner and J. Schieck and D. Schmiedmayer and S. Schönert and C. Schwertner and M. Stahlberg and L. Stodolsky and C. Strandhagen and R. Strauss and I. Usherov and F. Wagner and V. Wagner and V. Zema},
journal= {arXiv preprint arXiv:2403.03824},
year = {2024}
}
Comments
18 pages, 11 figures, additional figures and data in ancillary files (on arXiv or at journal reference)