ITP Hadron Physics Seminars and Workshops

Sigma term physics

by Prof. Ulf-G. Meißner (Universität Bonn & Forschungszentrum Jülich)

Asia/Shanghai
6420 (ITP South Building)

6420

ITP South Building

Description

The pion-nucleon sigma term sigma_{pi N} is an important quantity in strong interaction phenomenology and in searches for physics beyond the Standard Model. After a broad introduction, I discuss its precise extraction from pion-nucleon scattering data based on Roy-Steiner equations. In this context, tensions with recent lattice determination of sigma_{pi N} are discussed. Then, I turn to the flavor decomposition of the sigma term and the question of strangeness in the nucleon. Using different variants of baryon chiral perturbation theory, I discuss our present understanding and future improvements.

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