TY  - JOUR
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.
TI  - Sigma term and strangeness content of octet baryons
JO  - Physical review / D
VL  - 85
IS  - 1
SN  - 1550-7998
CY  - [S.l.]
PB  - Soc.
M1  - PreJuSER-18058
SP  - 014509
PY  - 2012
N1  - 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.
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 (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)).
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000299927500006
DO  - DOI:10.1103/PhysRevD.85.014509
UR  - https://juser.fz-juelich.de/record/18058
ER  -