On the up quark mass

Preprint

16 December 2003

preprint
Published by arXiv in arXiv

Abstract

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.

Keywords

PHYSICAL SINGULARITY
REMAIN MASSIVE
LIGHTEST QUARK
QUARKS REMAIN
NO PHYSICAL
SINGULARITY
CP PROBLEM
QUARK MASS

All Related Versions

Version 1, 2003-12-16, ArXiv
Version 2, 2004-03-04, ArXiv
Published version: Physical Review Letters, 92 (16), 162003.

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