231 citations · 599 across the 9 of their papers we have counts for
9 papers
Virtual Photons in Low Energy pi-pi Scattering
Marc Knecht, Res Urech
The low energy scattering of pions is investigated in the presence of electromagnetic interactions at leading order and at next-to-leading order for the amplitudes involving at mos…
Isospin Violation in tau -> 3 pi nu_tau
Erwin Mirkes, Res Urech
Isospin violating signals in the tau -> 3 pi nu_tau decay mode are discussed. For the tau -> pi^- pi^- pi^+ nu_tau decay mode, isospin violation arises from the vector current cont…
Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory
Robert Baur, Res Urech
The effective chiral Lagrangian of the strong and electromagnetic interactions of the pseudoscalar mesons at low energies depends on a set of low energy constants. We determine the…
Structure Functions in Semihadronic Tau Decays
Gilberto Colangelo, Markus Finkemeier, Erwin Mirkes +1
We review a variety of topics related to hadronic structure functions in exclusive semihadronic tau decays. We introduce the concept of structure functions and summarize the most i…
Tau Decays and Chiral Perturbation Theory
G. Colangelo, M. Finkemeier, R. Urech
In a small window of phase space, chiral perturbation theory can be used to make standard model predictions for tau decays into two and three pions. For , we give the a…
Hadronic Decays of Excited Heavy Quarkonia
Thomas Mannel, Res Urech
We construct an effective Lagrangian for the hadronic decays of a heavy excited -wave-spin-one quarkonium into its ground state. We show that reasonable fits to the measured inv…
On the Corrections to Dashen's Theorem
Robert Baur, Res Urech
The electromagnetic corrections to the masses of the pseudoscalar mesons and are considered. We calculate in chiral perturbation theory the contributions which arise from r…
Rho - omega mixing in chiral perturbation theory
Res Urech
In order to calculate the rho - omega mixing we extend the chiral couplings of the low-lying vector mesons in chiral perturbation theory to a lagrangian that contains two vector fi…
Virtual Photons in Chiral Perturbation Theory
R. Urech
In the framework of chiral perturbation theory virtual photons are included. We calculate the divergences of the generating functional to one loop and determine the structure of th…