Journal
PHYSICS LETTERS B
Volume 760, Issue -, Pages 74-78Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2016.06.038
Keywords
Pion-baryon interactions; Dispersion relations; Chiral Lagrangians; Chiral symmetries
Funding
- Helmholtz Virtual Institute NAVI [VH-VI-417]
- DFG [SFB/TR 16]
- DOE [DE-FG02-00ER41132]
- Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant [2015VMA076]
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The pion-nucleon sigma-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 3 sigma with respect to the phenomenological determination. 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. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.
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