Remarks on the pion–nucleon σ-term
The pion–nucleon σ-term can be stringently constrained by the combination of analyticity, unitarity, and crossing symmetry with phenomenological information on the pion–nucleon scattering lengths. Recently, lattice calculations at the physical point have been reported that find lower values by about 3σ with respect to the phenomenological determination. As a result, we point out that a lattice measurement of the pion–nucleon scattering lengths could help resolve the situation by testing the values extracted from spectroscopy measurements in pionic atoms.
- Authors:
-
[1]
; [2]
; [2]
; [3]
- Univ. of Washington, Seattle, WA (United States)
- Univ. Bonn, Bonn (Germany)
- Univ. Bonn, Bonn (Germany); Forschungszentrum Julich, Julich (Germany)
- Publication Date:
- Grant/Contract Number:
- FG02-00ER41132
- Type:
- Published Article
- Journal Name:
- Physics Letters. Section B
- Additional Journal Information:
- Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Research Org:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org:
- USDOE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; pion–baryon interactions; dispersion relations; Chiral Lagrangians; Chiral symmetries
- OSTI Identifier:
- 1259355
- Alternate Identifier(s):
- OSTI ID: 1361205