Synthetic data for the study of the CUORE detector response function

30 Aug 2021, 18:00
1h 30m
Poster Neutrino physics and astrophysics Poster session 1


Alberto Gianvecchio (UNIMIB)


Rare event searches share the need to isolate signal from background events, therefore experiments must develop good energy resolution detectors.
In this scenario, CUORE (Cryogenic Underground Observatory for Rare Events) exploits an array of 988 TeO$_{2}$ crystals operated as Low-Temperature Detectors (LTDs) at 10 mK. The main goal of the experiment is to search for neutrino-less double beta decay ($0\nu\beta\beta$) in $^{130}$Te. CUORE detectors show an excellent energy resolution making the experiment one of the most competitive for $0\nu\beta\beta$ searches in the world.
What I am going to present deals with the generation of synthetic data for the study of the CUORE detector response function. It is a novel technique consisting of simulations that reproduce the data acquisition by taking into account non-ideal elements, such as noise as well as the shape of the signals.
Synthetic data are processed with the CUORE official analysis software, allowing the evaluation of the analysis impact on the final results.
The goal of my work is to reproduce the peaks (in the energy spectrum) intrinsic shape and resolution linear trend as a function of energy. On one hand, the peak profile significantly deviates from a Gaussian distribution. On the other hand, the linear trend of the resolution (FWHM) as a function of energy is somewhat unexpected for LTDs.
To find contributions to both effects, I initially investigated the impact of pileup on the peak shape, identifying significant deviations with respect to a Gaussian response. Additionally, I studied the effect of pulses with variable shapes, highlighting a deviation from the Gaussian profile of the peak and an enlargement of the energy resolution comparable with observed data. Moreover, I was able to reproduce the resolution linear trend as a function of energy.
Synthetic data is the only method so far that provides a simulation, even though preliminary, of the observed peak behavior. This innovative simulation gave very promising results and proved to be an extremely effective technique for the study of the detector response function in CUORE.

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