Ambiguities in the Up-Quark Mass
- 23 April 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 92 (16) , 162003
- https://doi.org/10.1103/physrevlett.92.162003
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 problem via a vanishing mass for the lightest quark.
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