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                  【7.16】Sigma term physics
                  2019-07-15|文章来源: |【
                   
                  Seminar
                  Title: Sigma term physics
                  Speaker: Prof. Ulf-G. Meissner (Universit at Bonn & Forschungszentrum Julich)
                  Time: 3:00 PM,Jul.16th (Tuesday), 2019
                  Place: R319, Theoretical Physics Division

                  Abstract:
                  The pion-nucleon sigma term σπN is an important quantity in strong interaction phenomenology and in searches for physics beyond the Standard Model. After a broad introduction, the speaker will discuss its precise extraction from pion-nucleon scattering data based on Roy-Steiner equations. In this context, tensions with recent lattice determination of σπN are discussed. Then, he will 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, he will discuss the present understanding and future improvements.

                   
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