Testing chiral dynamics in pionic atoms
Year: 2003
Type: article
Abstract: The energy dependence of chirally expanded πN isoscalar and isovector amplitudes b 0 ( E ) and b 1 ( E ), respectively, for zero-momentum off-shell pions near threshold, is used to impose the minimal substitution requirement E → E − V C on the properly constructed pion optical potential within a large-scale fit to 100 pionic-atom data across the periodic table which also include the recently established ‘deeply bound’ pionic atoms of Pb and Sn. This fit cannot be reconciled with the well-known free-space values of the πN threshold amplitudes. In contrast, introducing the empirically known energy dependence for on-shell pions leads to a better fit and to satisfactory values for the πN threshold amplitudes. The difference between these two approaches is briefly discussed.
Source: Physics Letters B
Authors: E Friedman, A Gal
Institution: Hebrew University of Jerusalem
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid:
OpenAlex ID: W2084053528