Ruling Out the Massless Up-Quark Solution to the Strong $\pmbCP$ Problem by Computing the Topological Mass Contribution with Lattice QCD

Constantia Alexandrou, Jacob Finkenrath, Lena Funcke, Karl Jansen, Bartosz Kostrzewa, Ferenc Pittler, Carsten Urbach
February 2020
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Type
Journal article
Publication
Phys. Rev. Lett., (125), 23, https://doi.org/10.1103/PhysRevLett.125.232001