Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.022001
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Funding
- NSFC of China [11775002]
- DOE Office of Science Facility [DE-AC0206CH11357]
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We present an exploratory lattice QCD calculation of the neutrinoless double beta decay pi pi -> ee. Under the mechanism of light-neutrino exchange, the decay amplitude involves significant long-distance contributions. The calculation reported here, with pion masses m(pi) = 420 and 140 MeV, demonstrates that the decay amplitude can be computed from first principles using lattice methods. At unphysical and physical pion masses, we obtain that amplitudes are 24% and 9% smaller than the predication from leading order chiral perturbation theory. Our findings provide the lattice QCD inputs and constraints for effective field theory. A follow-on calculation with fully controlled systematic errors will be possible with adequate computational resources.
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