Sigma term and strangeness content of octet baryons

S. Dürr; Z. Fodor; T. Hemmert; C. Hoelbling; J. Frison; S. D. Katz; S. Krieg; T. Kurth; L. Lellouch; T. Lippert; A. Portelli; A. Ramos; A. Schäfer; K. K. Szabó

doi:10.1103/PhysRevD.85.014509

Sigma term and strangeness content of octet baryons

S. Dürr, Z. Fodor, T. Hemmert, C. Hoelbling, J. Frison, S. D. Katz, S. Krieg, T. Kurth, L. Lellouch, T. Lippert, A. Portelli, A. Ramos, A. Schäfer, K. K. Szabó

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark-mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our Nf=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (MπL≳4), and three values of the lattice spacing. Our main results are the nucleon sigma term σπN=39(4)(-7+18) and the strangeness content yN=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds yN=0.276(77)(-62+90).

Original language	English
Pages (from-to)	14509
Journal	Physical Review D, particles, fields, gravitation, and cosmology
Volume	85
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.85.014509
Publication status	Published - 1 Jan 2012

Keywords / Materials (for Non-textual outputs)

Lattice QCD calculations
Chiral Lagrangians
Protons and neutrons

Access to Document

10.1103/PhysRevD.85.014509

pdf

http://adsabs.harvard.edu/abs/2012PhRvD..85a4509D

Cite this

@article{f0e12027488d4b97a03ac9fc54b3d85c,

title = "Sigma term and strangeness content of octet baryons",

abstract = "By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark-mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our Nf=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (MπL≳4), and three values of the lattice spacing. Our main results are the nucleon sigma term σπN=39(4)(-7+18) and the strangeness content yN=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds yN=0.276(77)(-62+90).",

keywords = "Lattice QCD calculations, Chiral Lagrangians, Protons and neutrons",

author = "S. D{\"u}rr and Z. Fodor and T. Hemmert and C. Hoelbling and J. Frison and Katz, {S. D.} and S. Krieg and T. Kurth and L. Lellouch and T. Lippert and A. Portelli and A. Ramos and A. Sch{\"a}fer and Szab{\'o}, {K. K.}",

year = "2012",

month = jan,

day = "1",

doi = "10.1103/PhysRevD.85.014509",

language = "English",

volume = "85",

pages = "14509",

journal = "Physical Review D, particles, fields, gravitation, and cosmology",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "1",

}

TY - JOUR

T1 - Sigma term and strangeness content of octet baryons

AU - Dürr, S.

AU - Fodor, Z.

AU - Hemmert, T.

AU - Hoelbling, C.

AU - Frison, J.

AU - Katz, S. D.

AU - Krieg, S.

AU - Kurth, T.

AU - Lellouch, L.

AU - Lippert, T.

AU - Portelli, A.

AU - Ramos, A.

AU - Schäfer, A.

AU - Szabó, K. K.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark-mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our Nf=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (MπL≳4), and three values of the lattice spacing. Our main results are the nucleon sigma term σπN=39(4)(-7+18) and the strangeness content yN=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds yN=0.276(77)(-62+90).

AB - By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark-mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our Nf=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (MπL≳4), and three values of the lattice spacing. Our main results are the nucleon sigma term σπN=39(4)(-7+18) and the strangeness content yN=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds yN=0.276(77)(-62+90).

KW - Lattice QCD calculations

KW - Chiral Lagrangians

KW - Protons and neutrons

U2 - 10.1103/PhysRevD.85.014509

DO - 10.1103/PhysRevD.85.014509

M3 - Article

SN - 0556-2821

VL - 85

SP - 14509

JO - Physical Review D, particles, fields, gravitation, and cosmology

JF - Physical Review D, particles, fields, gravitation, and cosmology

IS - 1

ER -

Sigma term and strangeness content of octet baryons

Abstract

Keywords / Materials (for Non-textual outputs)

Access to Document

Fingerprint

Cite this