Dresden 2013 – wissenschaftliches Programm

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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 σ_{π N} and σ_s employing covariant baryon chiral perturbation theory and updated experimental information. We show how these determinations overcome the difficulties that the old values of σ_{π 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 σ_{π N} and σ_s are in good agreement with updated phenomenology and recent LQCD calculations.