Theia: An advanced optical neutrino detector
M. Askins, Z. Bagdasarian, N. Barros, E.W. Beier, E. Blucher, R., Bonventre, E. Callaghan, J. Caravaca, M. Diwan, S.T. Dye, J. Eisch, A., Elagin, T. Enqvist, V. Fischer, K. Frankiewicz, C. Grant, D. Guffanti, C., Hagner, A. Hallin, C. M. Jackson, R. Jiang, T. Kaptanoglu

TL;DR
Theia is a proposed large-scale optical neutrino detector utilizing advanced scintillator and photon detection technologies to distinguish signals, enabling diverse physics measurements including neutrino properties, astrophysics, and rare decay searches.
Contribution
This paper introduces Theia, a novel detector design integrating new optical and computing techniques for enhanced neutrino detection and background rejection.
Findings
Designs for Theia 25 and Theia 100 with different scales and capabilities.
Potential to observe a wide range of neutrino phenomena and rare processes.
Enhanced background rejection enabling sensitive physics measurements.
Abstract
New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic photon sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov and scintillation signals. Such a detector could exploit these two distinct signals to observe particle direction and species using Cherenkov light while also having the excellent energy resolution and low threshold of a scintillator detector. Situated in a deep underground laboratory, and utilizing new techniques in computing and reconstruction techniques, such a detector could achieve unprecedented levels of background rejection, thus enabling a rich physics program that would span topics in nuclear, high-energy, and astrophysics, and across a dynamic range from hundreds of keV to many GeV. The scientific program would include observations of low- and high-energy solar…
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