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17 papers · 2 filters
Scheme Dependence of Weak Matrix Elements in the Expansion
Johan Bijnens, Joaquim Prades
We show how the scheme- and scale-dependence of the short-distance operator product expansion with four-quark operators can be correctly accounted for in the framework of the $1/N_…
Quark mixing: determination of top couplings
F. del Aguila
The top flavour-changing neutral couplings can be large in extended models with vector-like quarks. In the next decade(s) the CERN Large Hadron Collider will allow to measure (boun…
The Minimal Extension of the SM and the Neutrino Oscillation Data
F. Del Aguila, J. Gluza, M. Zralek
We study the simplest Standard Model estension with only one extra right-handed neutrino. In this case there are two massless and two massive neutrinos, and in…
Tau Decay Determination of the Strange Quark Mass
A. Pich, J. Prades
The recent ALEPH measurements of the inclusive Cabibbo--suppressed decay width of the and several moments of its invariant mass distribution are used to determine the value of…
Four Fermion Contact Terms in Charged Current Processes and Large Extra Dimensions
Fernando Cornet, Monica Relano, Javier Rico
We study the bounds that can be obtained on four-fermion contact terms from the experimental data for (e+ p -> \bar{nu} X) obtained at HERA and (p \bar{p} -> e ν), measured at TEVA…
The Rule for Kaons
Joaquim Prades
We report on recent advances at understanding the rule for kaons. We get reasonable matching between short-- and long--distances for scales between between 0.6 and 1.0 Ge…