%0 Journal Article
%A Dürr, S.
%A Fodor, Z.
%A Hemmert, T.
%A Hoelbling, C.
%A Frison, J.
%A Katz, S.D.
%A Krieg, S.
%A Kurth, T.
%A Lellouch, L.
%A Lippert, T.
%A Portelli, A.
%A Ramos, A.
%A Schäfer, A.
%A Szabó, K.K.
%T Sigma term and strangeness content of octet baryons
%J Physical review / D
%V 85
%N 1
%@ 1550-7998
%C [S.l.]
%I Soc.
%M PreJuSER-18058
%P 014509
%D 2012
%Z Computations were performed using HPC resources from F.Z. Julich and from GENCI-[IDRIS/ CCRT] (Grant No. 52275) and clusters at Wuppertal and CPT. This work is supported in part by EU Grants No. I3HP, FP7/2007-2013/ERC, No. 208740, No. MRTN-CT-2006-035482 (FLAVIAnet), DFG Grants No. FO 502/2, SFB-TR 55, by CNRS Grant GDR No. 2921, and PICS No. 4707. The authors also thank Martin Jung for pointing out an error in the normalization of the dimensionless sigma terms.
%X 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 (M pi L greater than or similar to 4), and three values of the lattice spacing. Our main results are the nucleon sigma term sigma(pi N) = 39(4)((+18)(-7)) and the strangeness content y(N) = 0.20(7)((+13)(-17)). Under the assumption of validity of covariant baryon chi PT in our range of masses one finds y(N) = 0.276(77)((+90)(-62)).
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000299927500006
%R 10.1103/PhysRevD.85.014509
%U https://juser.fz-juelich.de/record/18058