• Open Access

Light-Neutrino Exchange and Long-Distance Contributions to 0ν2β Decays: An Exploratory Study on ππee

Xu Feng, Lu-Chang Jin, Xin-Yu Tuo, and Shi-Cheng Xia
Phys. Rev. Lett. 122, 022001 – Published 15 January 2019

Abstract

We present an exploratory lattice QCD calculation of the neutrinoless double beta decay ππee. Under the mechanism of light-neutrino exchange, the decay amplitude involves significant long-distance contributions. The calculation reported here, with pion masses mπ=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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  • Received 1 October 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.022001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Techniques
Particles & Fields

Authors & Affiliations

Xu Feng1,2,3,4,*, Lu-Chang Jin5,6,†, Xin-Yu Tuo1, and Shi-Cheng Xia1

  • 1School of Physics, Peking University, Beijing 100871, China
  • 2Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
  • 3Center for High Energy Physics, Peking University, Beijing 100871, China
  • 4State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 5Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
  • 6RIKEN-BNL Research Center, Brookhaven National Laboratory, Building 510, Upton, New York 11973, USA

  • *xu.feng@pku.edu.cn
  • ljin.luchang@gmail.com

Article Text

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Issue

Vol. 122, Iss. 2 — 18 January 2019

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