Phys. Rev. Lett. 92, 162003 (2004) [4 pages]Ambiguities in the Up-Quark MassReceived 15 December 2003; published 23 April 2004 It has long been known that no physical singularity is encountered as up-quark mass is adjusted from small positive to negative values as long as all other quarks remain massive. This is tied to an additive ambiguity in the definition of the quark mass. This calls into question the acceptability of attempts to solve the strong CP problem via a vanishing mass for the lightest quark. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.162003
DOI:
10.1103/PhysRevLett.92.162003
PACS:
11.30.Er, 11.10.Gh, 11.15.Ha, 12.39.Fe
See AlsoComment: Mark Srednicki, Comment on “Ambiguities in the Up-Quark Mass”, Phys. Rev. Lett. 95, 059101 (2005). |
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