Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10720734 | Nuclear Physics B | 2013 | 25 Pages |
Abstract
We analyze Nf=2 nucleon mass data with respect to their dependence on the pion mass down to mÏ=157MeV and compare it with predictions from covariant baryon chiral perturbation theory (BChPT). A novel feature of our approach is that we fit the nucleon mass data simultaneously with the directly obtained pion-nucleon Ï-term. Our lattice data below mÏ=435MeV is well described by O(p4) BChPT and we find Ï=37(8)(6)MeV for the Ï-term at the physical point. Using the nucleon mass to set the scale we obtain a Sommer parameter of r0=0.501(10)(11)fm.
Keywords
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Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
QCDSF Collaboration QCDSF Collaboration, G.S. Bali, P.C. Bruns, S. Collins, M. Deka, B. GläÃle, M. Göckeler, L. Greil, T.R. Hemmert, R. Horsley, J. Najjar, Y. Nakamura, A. Nobile, D. Pleiter, P.E.L. Rakow, A. Schäfer, R. Schiel, G. Schierholz,