Three-particle <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:math> state contribution to the nucleon two-point function in lattice QCD
Physical review. D/Physical review. D.