3,020 research outputs found
ATLAS Detector Paper Back-Up Note: Electrons and Photons
This is the supporting note to the ATLAS Detector paper for electron and photon reconstruction with the Inner Detector. It describes the software used to produce the results presented in the ATLAS Detector paper
'Searching for a needle in a haystack;' A Ba-tagging approach for an upgraded nEXO experiment
nEXO is a proposed experiment that will search for neutrinoless double-beta
decay (0) in 5-tonnes of liquid xenon (LXe), isotopically
enriched in Xe. A technique called Ba-tagging is being developed as a
potential future upgrade for nEXO to detect the Xe double-beta decay
daughter isotope, Ba. An efficient Ba-tagging technique has the
potential to boost nEXO's 0 sensitivity by essentially
suppressing non-double-beta decay background events. A conceptual approach for
the extraction from the detector volume, trapping, and identification of a
single Ba ion from 5 tonnes of LXe is presented, along with initial results
from the commissioning of one of its subsystems, a quadrupole mass filter.Comment: 4 pages, 2 figure
Investigation of radioactivity-induced backgrounds in EXO-200
The search for neutrinoless double-beta decay (0{\nu}{\beta}{\beta}) requires
extremely low background and a good understanding of their sources and their
influence on the rate in the region of parameter space relevant to the
0{\nu}{\beta}{\beta} signal. We report on studies of various {\beta}- and
{\gamma}-backgrounds in the liquid- xenon-based EXO-200 0{\nu}{\beta}{\beta}
experiment. With this work we try to better understand the location and
strength of specific background sources and compare the conclusions to
radioassay results taken before and during detector construction. Finally, we
discuss the implications of these studies for EXO-200 as well as for the
next-generation, tonne-scale nEXO detector.Comment: 9 pages, 7 figures, 3 table
Deep Neural Networks for Energy and Position Reconstruction in EXO-200
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In
the studied cases, the DNN is able to reconstruct the relevant parameters -
total energy and position - directly from raw digitized waveforms, with minimal
exceptions. For the first time, the developed algorithms are evaluated on real
detector calibration data. The accuracy of reconstruction either reaches or
exceeds what was achieved by the conventional approaches developed by EXO-200
over the course of the experiment. Most existing DNN approaches to event
reconstruction and classification in particle physics are trained on Monte
Carlo simulated events. Such algorithms are inherently limited by the accuracy
of the simulation. We describe a unique approach that, in an experiment such as
EXO-200, allows to successfully perform certain reconstruction and analysis
tasks by training the network on waveforms from experimental data, either
reducing or eliminating the reliance on the Monte Carlo.Comment: Accepted version. 33 pages, 28 figure
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