Meson-baryon sigma terms in QCD Sum Rules

Abstract

We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent calculations. It is also found that the pion-Delta sigma term is as large as the pion-nucleon sigma term.

14 pages, 2 figures; extended discussion and added references; version to be published in Phys. Lett. B

References in corpus (29)

• Heavy Baryon Chiral Perturbation Theory with Light Deltas
• Aspects of chiral pion-nucleon physics
• Chiral expansion of baryon masses and $\sigma$-terms
• Effective theory of the Delta(1232) in Compton scattering off the nucleon
• QCD Sum Rules for Skeptics
• Negative-parity Nucleon Resonance in the QCD Sum Rule
• Nucleon mass, sigma term and lattice QCD
• Critical Analysis of Baryon Masses and Sigma-Terms in Heavy Baryon Chiral Perturbation Theory
• $\pi N\sigma$ Term , $\bar{s}s$ in Nucleon, and Scalar Form Factor --- a Lattice Study
• Sigma-term physics in the perturbative chiral quark model
• Sigma Terms of Light-Quark Hadrons
• Pion-Nucleon Sigma Term in Lattice QCD
• Infrared regularization with spin-3/2 fields
• Chiral Extrapolations and the Covariant Small Scale Expansion
• The Pion-Nucleon sigma-Term with Dynamical Wilson Fermions
• On the analysis of the pion--nucleon $\sigma$--term: The size of the remainder at the Cheng--Dashen point
• Updated analysis of meson-nucleon sigma terms in the perturbative chiral quark model
• Lattice QCD Calculations of the Sigma Commutator
• Baryon masses and pion-nucleon $\sigma$-term to second order in the quark masses
• Predicative Ability of QCD Sum Rules for Decuplet Baryons
• Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons
• The sigma-term form factor of the nucleon in the large-Nc limit
• Pion-nucleon Sigma Term in the Global Color Model of QCD
• The nucleon-sigma coupling constant in QCD Sum Rules
• Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules
• QCD sum rules and chiral logarithms
• Pion-delta sigma-term
• QCD sum rules vs. chiral perturbation theory
• the Three-Point Vertex of Hadron Interaction with External Fields in QCD Sum Rules

Cited by in corpus (5)

• Recent Progress in QCD Condensate Evaluations and Sum Rules
• Probing the quark-gluon interaction with hadrons
• Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism
• Finite-width effects on Delta baryons in QCD Sum Rules
• QCD Sum Rules study of meson-baryon sigma terms