This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevD.85.014509 in citations.
Please use the identifier: http://hdl.handle.net/2128/11140 in citations.
Sigma term and strangeness content of octet baryons
Sigma term and strangeness content of octet baryons
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 chi...
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Personal Name(s): | Dürr, S. |
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Fodor, Z. / Hemmert, T. / Hoelbling, C. / Frison, J. / Katz, S.D. / Krieg, S. / Kurth, T. / Lellouch, L. / Lippert, T. / Portelli, A. / Ramos, A. / Schäfer, A. / Szabó, K.K. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC |
Published in: | Physical Review D Physical review / D, 85 85 (2012 2012) 1 1, S. 014509 014509 |
Imprint: |
[S.l.]
Soc.
2012
2012-01-26 2012-01-01 |
Physical Description: |
014509 |
DOI: |
10.1103/PhysRevD.85.014509 |
Document Type: |
Journal Article |
Research Program: |
Computational Science and Mathematical Methods Scientific Computing |
Series Title: |
Physical Review D
85 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/11140 in citations.
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)). |