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Neutrinoless double-β decay and QCD corrections
1Theoretical Physics Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India.
Physical Review Letters
|February 4, 2014
Summary
One-loop Quantum Chromodynamics (QCD) corrections significantly impact neutrinoless double-beta decay amplitudes. These corrections can cause large cancellations or enhancements, affecting half-life predictions.
Area of Science:
- Particle Physics
- Nuclear Physics
- Quantum Chromodynamics
Background:
- Neutrinoless double-beta decay is a key process for understanding neutrino properties.
- Current half-life estimates are limited by nuclear physics uncertainties.
- Short-range contributions to the decay amplitude are crucial but complex.
Purpose of the Study:
- To investigate the impact of one-loop Quantum Chromodynamics (QCD) corrections on the short-range part of the neutrinoless double-beta decay amplitude.
- To analyze the renormalization group running of these corrections.
- To assess how these corrections influence half-life predictions.
Main Methods:
- Calculation of one-loop QCD corrections to the relevant operators.
- Renormalization group evolution of the short-range decay amplitude.
- Analysis of specific operator examples to quantify corrections.
Main Results:
- One-loop QCD corrections to the short-range amplitude are found to be sizeable.
- Depending on the operator, these corrections lead to moderate to large cancellations or significant enhancements.
- Specific examples illustrate the substantial impact of these corrections.
Conclusions:
- The calculated QCD corrections necessitate re-evaluation of neutrinoless double-beta decay half-life estimates.
- These corrections can either reduce or increase the decay rate, impacting the precision of future measurements.
- Addressing these short-range contributions is vital for advancing the search for neutrinoless double-beta decay.
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