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(Seminar) Sigma term physics
2019-07-17  【 】【打印】【關閉

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

題目

Sigma term physics

Speaker

報告人

Prof. Ulf-G. Meissner

Affiliation

所在單位

University Bonn & Forschungszentrum Jülich

Date

日期

2019年7月17日(周三)上午10:00

Venue

地點

ITP South Building 6420

Abstract

摘要

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.

Contact Person

所內聯系人

郭奉坤

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