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Topological background discrimination in the PandaX-III neutrinoless double beta decay experiment

Journal Article · · Journal of Physics. G, Nuclear and Particle Physics
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  1. Shanghai Jiao Tong Univ. (China); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  2. Shanghai Jiao Tong Univ. (China)
  3. Shanghai Jiao Tong Univ. (China); Univ. of Maryland, College Park, MD (United States)
  4. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. China Inst. of Atomic Energy (CIAE), Beijing (China)
  6. Peking University, Beijing (China)
  7. Shandong Univ., Jinan (China)
  8. Sun Yat-Sen Univ., Guangzhou (China)
  9. Univ. of Science and Technology of China, Hefei (China)
  10. Univ. of Zaragoza (Spain)
  11. Shanghai Jiao Tong Univ. (China); Univ. of Zaragoza (Spain)
  12. Central China Normal University, Wuhan (China)
  13. Univ. of Maryland, College Park, MD (United States)
  14. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  15. Suranaree Univ. of Technology (Thailand)
+ Show Author Affiliations
The PandaX-III experiment plans to search for neutrinoless double beta decay (0νββ) of 136Xe in the China JinPing underground Laboratory (CJPL). The experiment will use a high pressure gaseous time projection chamber (TPC) to register both the energy and the electron track topology of an event. This article is devoted to demonstrate our particular detector setup capabilities for the identification of 0νββ and the consequent background reduction. As software tool we use REST, a framework developed for the reconstruction and simulation of TPC-based detector systems. We study the potential for background reduction by introducing appropriate parameters based on the properties of 0νββ events. We exploit for the first time not only the energy density of the electron track-ends, but also the electron scattering angles produced by an electron near the end of its trajectory. To implement this, we have added new algorithms for detector signal and track processing inside REST. Their assessment shows that background can be reduced by about 7 orders of magnitude while keeping 0νββ efficiency above 20% for the PandaX-III baseline readout scheme, a two-dimensional 3 mm pitch stripped readout. More generally, we use the potential of REST to handle 2D/3D data to assess the impact on signal-to-background significance at different detector granularities, and to validate the PandaX-III baseline choice. Finally, we demonstrate the additional potential to discriminate surface background events generated at the readout plane in the absence of to, by making use of event parameters related with the diffusion of electrons.
Research Organization:
University of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0004658
OSTI ID:
2955838
Alternate ID(s):
OSTI ID: 23018079
Journal Information:
Journal of Physics. G, Nuclear and Particle Physics, Journal Name: Journal of Physics. G, Nuclear and Particle Physics Journal Issue: 4 Vol. 47; ISSN 0954-3899; ISSN 1361-6471
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

Majorana
PandaX-III
double beta decay
mass
neutrino
pattern recognition
topology