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Setting Limits on Supersymmetry Using Simplified Models
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Search for Neutrinoless Double-β Decay with the Complete EXO-200 Dataset.

G Anton1, I Badhrees2, P S Barbeau3

  • 1Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen 91058, Germany.

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|November 9, 2019
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This summary is machine-generated.

Researchers searched for neutrinoless double-beta decay (0νββ) in Xenon-136. The experiment found no evidence, setting a new lower limit for this rare nuclear decay process.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Experimental Physics

Background:

  • Neutrinoless double-beta decay (0νββ) is a hypothetical type of radioactive decay.
  • Its observation would indicate that neutrinos are Majorana particles and violate lepton number conservation.
  • ^{136}Xe is a promising isotope for 0νββ searches due to its high Q value.

Purpose of the Study:

  • To search for 0νββ in ^{136}Xe using the full EXO-200 dataset.
  • To improve sensitivity and precision in detecting 0νββ events.
  • To set a new lower limit on the 0νββ half-life of ^{136}Xe.

Main Methods:

  • Utilized the full EXO-200 dataset for analysis.
  • Employed a deep neural network for enhanced discrimination between 0νββ signals and background events.
  • Leveraged an upgraded detector with improved energy resolution and signal detection efficiency.

Main Results:

  • Achieved a signal detection efficiency of 96.4±3.0%, a significant improvement over previous analyses.
  • Improved the detector's energy resolution at the Q value of ^{136}Xe 0νββ to 1.15±0.02%.
  • Established a 90% confidence level 0νββ half-life sensitivity of 5.0×10^{25} yr with 234.1 kg·yr of ^{136}Xe exposure.

Conclusions:

  • No statistically significant evidence for 0νββ in ^{136}Xe was observed.
  • A new lower limit on the 0νββ half-life of ^{136}Xe was set at 3.5×10^{25} yr (90% confidence level).
  • The results constrain theories of new physics beyond the Standard Model.