Phys. Rev. D 52, 3139–3142 (1995)Comment on ‘‘Negative δρ with four families in the standard model’’Received 14 November 1994; published in the issue dated 1 September 1995 We consider the contribution of a heavy fourth generation to the ρ parameter. We show that recent claims of a large negative contribution to δρ from a hypothetical heavy fourth family are not well founded. We discuss certain difficulties in the application of dispersion relations to the calculation of δρ and how these give rise to uncertainties in both the magnitude and the sign of δρ. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.52.3139
DOI:
10.1103/PhysRevD.52.3139
PACS:
11.55.Fv, 12.15.Lk
See AlsoOriginal Article: P. Q. Hung, R. McCoy, and D. Singleton, Negative δρ with four families in the standard model, Phys. Rev. D 50, 2082 (1994). |
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