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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Hadronenstruktur und -spektroskopie
HK 44.8: Vortrag
Dienstag, 5. März 2013, 18:45–19:00, HSZ-403
Updated determinations of the pion-nucleon sigma term and the strangeness content of the nucleon with covariant baryon chiral perturbation theory — •Jose Manuel Alarcon1, Jorge Martin Camalich2, and Jose Antonio Oller3 — 1Institut für Kernphysik, Johannes Gutenberg Universität, Mainz D-55099, Germany — 2Department of Physics and Astronomy, University of Sussex, BN1 9QH, Brighton, UK — 3Departamento de Fśica. Universidad de Murcia. E-30071, Murcia, Spain
In this talk I want to present the community our recent determinations of σπ N and σs employing covariant baryon chiral perturbation theory and updated experimental information. We show how these determinations overcome the difficulties that the old values of σπ N=45 MeV and y≈ 0.23 have when trying to explain the modern experiments regarding the nuclear structure and LQCD determinations. From our results, a new scenario emerges where σπ N and σs are in good agreement with updated phenomenology and recent LQCD calculations.