[Triumf-seminars] TRIUMF Seminar today at 14:00

[postmaster@admin.triumf.ca]

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Date/Time: Thu 2006-03-02 at 14:00

Location:  Auditorium          

Speaker:   Stefan Scherer (University of Mainz)

Title:     Chiral perturbation theory--success and challenge

Abstract: Chiral perturbation theory is the effective field theory of the strong interactions at low energies. We will give a short introduction to chiral perturbation theory for mesons and will discuss, as an example, the electromagnetic polarizabilities of the pion. These have recently been extracted from an experiment on radiative $\pi^+$ photoproduction from the proton ($\gamma p\to \gamma \pi^+ n$) at the Mainz Microtron MAMI. Next we will turn to the one-baryon sector of chiral perturbation theory and will address the issue of a consistent power counting scheme. As an example of the heavy-baryon framework we will comment on the extraction of the axial radius from pion electroproduction. We will then discuss two recently proposed manifestly Lorentz-invariant renormalization schemes and illustrate their application in a calculation of the nucleon electromagnetic form factors. Finally, we will outline a systematic implementation of the $\Delta(1232)$ resonance into the effective field theory program.


Stimulants available 15 minutes before the talk.

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Subscription information available at http://admin.triumf.ca/netdata/seminars/list


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