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arXiv · hep-lat/0112029

Is strong CP invariance due to a massless up quark?

Daniel R. Nelson·George T. Fleming·Gregory W. Kilcup
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Abstract

A standing mystery in the Standard Model is the unnatural smallness of the strong CP violating phase. A massless up quark has long been proposed as one potential solution. A lattice calculation of the constants of the chiral Lagrangian essential for the determination of the up quark mass, 2 alpha_8 - alpha_5, is presented. We find 2 alpha_8 - alpha_5 = 0.29 +/- 0.18, which corresponds to m_u / m_d = 0.410 +/- 0.036. This is the first such calculation using a physical number of dynamical light quarks, N_f = 3.

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Daniel R. Nelson, George T. Fleming, Gregory W. Kilcup. 2002-08-26. Is strong CP invariance due to a massless up quark?. https://doi.org/10.1103/physrevlett.90.021601

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