QCD sum rules study of meson-baryon sigma terms

Journal Article · Sat Nov 01 00:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.094003· OSTI ID:21254608

Erkol, Gueray; Oka, Makoto; Turan, Guersevil ^[1]

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1. Department of Physics, H27, Tokyo Institute of Technology, Meguro, Tokyo 152-8551 (Japan)

The pion-baryon sigma terms and the strange-quark condensates of the octet and the decuplet baryons are calculated by employing the method of QCD sum rules. We evaluate the vacuum-to-vacuum transition matrix elements of two baryon interpolating fields in an external isoscalar-scalar field and use a Monte Carlo-based approach to systematically analyze the sum rules and the uncertainties in the results. We extract the ratios of the sigma terms, which have rather high accuracy and minimal dependence on QCD parameters. We discuss the sources of uncertainties and comment on possible strangeness content of the nucleon and the Delta.

• OSTI ID: 21254608
• Journal Information: Physical Review. D, Particles Fields, Vol. 78, Issue 9; Other Information: DOI: 10.1103/PhysRevD.78.094003; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BARYONS
CONDENSATES
MATRIX ELEMENTS
MONTE CARLO METHOD
NUCLEONS
PIONS
QUANTUM CHROMODYNAMICS
S QUARKS
SCALAR FIELDS
SIGMA TERMS
STRANGENESS
SUM RULES