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Title: 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]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Univ. Bonn, Bonn (Germany)
  3. 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