Extracting σπn from pionic atoms

Eliahu Friedman, Avraham Gal

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We discuss a recent extraction of the πN σ term σπN from a large-scale fit of pionic-atom strong-interaction data across the periodic table. The value thus derived, σπN FG = 57 ± 7 MeV, is directly connected via the Gell-Mann–Oakes–Renner expression to the medium-renormalized πN isovector scattering amplitude near threshold. It compares well with the value derived recently by the Bern–Bonn–Jülich group, σπN RS = 58 ± 5 MeV, using the Roy–Steiner equations to control the extrapolation of the vanishingly small near-threshold πN isoscalar scattering amplitude to zero pion mass.

Original languageEnglish
Pages (from-to)45-54
Number of pages10
JournalActa Physica Polonica B
Volume51
Issue number1
DOIs
StatePublished - 2020

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© 2020 Jagellonian University. All rights reserved.

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