Speaker
Balma Duch
(Institut de Física d'Altes Energies (IFAE))
Description
We calculate the 1-loop $\gamma Z$ box-graph correction to electron-quark scattering at low energy and low momentum transfer. Both electron and quark masses are kept non-zero. From our result, we extract coupling constants for the low-energy effective Lagrangian with parity-violating 4-fermion interaction terms. We study the zero-mass limits and show that a non-zero electron mass is sufficient to obtain finite, well-defined couplings which are insensitive to a hadronic mass cutoff. We finally discuss the impact of our results on the determination of the weak charge of the proton from polarized electron-proton scattering.
| Speaker confirmation | Yes |
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Authors
Balma Duch
(Institut de Física d'Altes Energies (IFAE))
Hubert Spiesberger
(Institut für Physik, University Mainz)
Pere Masjuan
(Institut de Física d'Altes Energies (IFAE))