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9 papers · 2 filters
Strange Quark Mass Dependence of the Tau Hadronic Width
Joaquim Prades, Antonio Pich
The perturbative quark mass corrections to the tau hadronic width are studied to O(alpha_s^3 m_q^2). Including up to dimension four corrections, we get m_s(4 GeV^2)=(143 \pm 42) Me…
The Rule in the Chiral Limit
Johan Bijnens, Joaquim Prades
We discuss the matching between long-distance and short-distance at next-to-leading in and show how the scheme-dependence from the two-loop renormalization group running ca…
The light Higgs in supersymmetric models with Higgs triplets
M. Masip
In supersymmetric models the presence of Higgs triplets introduce new quartic interactions for the doublets that may raise the mass of the lightest CP-even field up to 205 GeV. We…
Constraints on top couplings in models with exotic quarks
F. del Aguila, J. A. Aguilar-Saavedra, R. Miquel
The extension of the Standard Model with exotic quark singlets and doublets introduces large flavor changing neutral couplings between ordinary fermions. We derive inequalities whi…
Automatized One-Loop Calculations in 4 and D dimensions
T. Hahn, M. Perez-Victoria
Two program packages are presented for evaluating one-loop amplitudes. They can work either in dimensional regularization or in constrained differential renormalization. The latter…
Techniques for one-loop calculations in constrained differential renormalization
F. del Aguila, A. Culatti, R. Munoz-Tapia +1
We describe in detail the constrained procedure of differential renormalization and develop the techniques required for one-loop calculations. As an illustration we renormalize Sca…