2–7 Sept 2018
Europe/Rome timezone

Light Hypernuclei : a Testbed for Charge Symmetry Breaking

4 Sept 2018, 09:30
30m

Speaker

Prof. Patrick Achenbach (Institut für Kernphysik, Joh. Gutenberg-Universität Mainz)

Description

Charge symmetry is broken in QCD by the up-down quark mass difference and electromagnetic interactions. In Λ hypernuclei, charge symmetry breaking (CSB) manifests itself in a charge dependence of Λ separation energies. At the Mainz Microtron MAMI the novel method of high-resolution spectroscopy of decay-pions in strangeness electroproduction was established to measure Λ separation energies. A sizable CSB effect was reaffirmed for the A = 4 mirror pair and until recently it could not be reproduced in any ab initio 4-body calculation. The full understanding of this large and spin-dependent effect remains one of the unresolved issues of hypernuclear physics.

Presentation materials