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arxiv: 2209.00461 · v2 · pith:UCVBVGIZnew · submitted 2022-08-22 · ⚛️ physics.ins-det · astro-ph.IM

Secular Equilibrium Assessment in a CaWO₄ Target Crystal from the Dark Matter Experiment CRESST using Bayesian Likelihood Normalisation

G. Angloher , S. Banik , G. Benato , A. Bento , A. Bertolini , R. Breier , C. Bucci , J. Burkhart
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L. Canonica A. D'Addabbo S. Di Lorenzo L. Einfalt A. Erb F. v. Feilitzsch N. Ferreiro Iachellini S. Fichtinger D. Fuchs A. Fuss A. Garai V.M. Ghete P. Gorla S. Gupta D. Hauff M. Je\v{s}kovsk\'y J. Jochum M. Kaznacheeva A. Kinast H. Kluck H. Kraus A. Langenk\"amper M. Mancuso L. Marini V. Mokina A. Nilima M. Olmi T. Ortmann C. Pagliarone L. Pattavina F. Petricca W. Potzel P. Povinec F. Pr\"obst F. Pucci F. Reindl J. Rothe K. Sch\"affner J. Schieck D. Schmiedmayer S. Sch\"onert C. Schwertner M. Stahlberg L. Stodolsky C. Strandhagen R. Strauss I. Usherov F. Wagner M. Willers V. Zema (CRESST Collaboration) F. Ferella M. Laubenstein S. Nisi
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classification ⚛️ physics.ins-det astro-ph.IM
keywords mathrmnormalisationbayesiancawocresstcrystaldarkequilibrium
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CRESST is a leading direct detection sub-$\mathrm{GeVc}^{-2}$ dark matter experiment. During its second phase, cryogenic bolometers were used to detect nuclear recoils off the $\mathrm{CaWO}_4$ target crystal nuclei. The previously established electromagnetic background model relies on secular equilibrium (SE) assumptions. In this work, a validation of SE is attempted by comparing two likelihood-based normalisation results using a recently developed spectral template normalisation method based on Bayesian likelihood. We find deviations from SE; further investigations are necessary to determine their origin.

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