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 - 2012/1/26
Y1 - 2012/1/26
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 N f=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (M πL 4), and three values of the lattice spacing. Our main results are the nucleon sigma term σ πN=39(4)(-7+18) and the strangeness content y N=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds y N=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 N f=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (M πL 4), and three values of the lattice spacing. Our main results are the nucleon sigma term σ πN=39(4)(-7+18) and the strangeness content y N=0.20(7)(-17+13). Under the assumption of validity of covariant baryon χPT in our range of masses one finds y N=0.276(77)(-62+90).
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U2 - 10.1103/PhysRevD.85.014509
DO - 10.1103/PhysRevD.85.014509
M3 - Article
AN - SCOPUS:84856683130
SN - 1550-7998
VL - 85
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - 014509
ER -