Lattice QCD calculation of the light sterile neutrino contribution in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>0</mml:mn><mml:mi>ν</mml:mi><mml:mn>2</mml:mn><mml:mi>β</mml:mi></mml:mrow></mml:math> decay
Physical review. D/Physical review. D.