TY - JOUR
T1 - Extracting σπn from pionic atoms
AU - Friedman, Eliahu
AU - Gal, Avraham
N1 - Publisher Copyright:
© 2020 Jagellonian University. All rights reserved.
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85078567321&partnerID=8YFLogxK
U2 - 10.5506/APhysPolB.51.45
DO - 10.5506/APhysPolB.51.45
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AN - SCOPUS:85078567321
SN - 0587-4254
VL - 51
SP - 45
EP - 54
JO - Acta Physica Polonica B
JF - Acta Physica Polonica B
IS - 1
ER -