New Result for the Pion-Nucleon Sigma Term from an Updated VPI/GW Pion-Nucleon Partial-Wave and Dispersion Relation Analysis
M.M. Pavan (1), R.A. Arndt (2), I.I Strakovsky, R.L. Workman (3), ((1) Lab for Nuclear Science, M.I.T., Cambridge, MA ; (2) Dept. of Physics,, V.P.I., Blacksburg, VA ; (3) Dept. of Physics, The George Washington, University, Washington, D.C.)
TL;DR
This paper presents a new estimate of the nucleon sigma term using updated pion-nucleon scattering data and dispersion relations, challenging previous canonical values and aligning with recent experimental insights.
Contribution
It provides an updated and potentially more accurate value for the nucleon sigma term based on refined analysis methods and new experimental data.
Findings
Sigma = 90 +/- 8 MeV, higher than previous estimates
Disagreement with canonical value of 64 +/- 8 MeV
Consistent with recent experimental and theoretical developments
Abstract
A new result for the nucleon sigma term from an updated pion-nucleon partial-wave and dispersion relation analysis of the Virginia Polytechnic Institute (now George Washington University) group is discussed. Using a method similar to that of Gasser, Leutwyler, Locher, and Sainio, we obtain Sigma=90 +/- 8 MeV (preliminary), in disagreement with the canonical result 64 +/- 8 MeV, but consistent with expectations based on new information on the NN coupling constant, pionic atoms, and the Delta resonance width.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Nuclear physics research studies · Particle physics theoretical and experimental studies