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https://hdl.handle.net/2440/79774
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Type: | Journal article |
Title: | Sigma terms from an SU(3) chiral extrapolation |
Author: | Shanahan, P. Thomas, A. Young, R. |
Citation: | Physical Review D: Particles, Fields, Gravitation and Cosmology, 2013; 87(7):1-7 |
Publisher: | American Physical Soc |
Issue Date: | 2013 |
ISSN: | 1550-7998 1550-2368 |
Statement of Responsibility: | P. E. Shanahan, A.W. Thomas, and R. D. Young |
Abstract: | We report a new analysis of lattice simulation results for octet baryon masses in 2+1-flavor QCD, with an emphasis on a precise determination of the pion-nucleon and strangeness nucleon sigma terms. A controlled chiral extrapolation of a recent PACS-CS Collaboration data set yields baryon masses which exhibit remarkable agreement both with experimental values at the physical point and with the results of independent lattice QCD simulations at unphysical meson masses. Using the Feynman-Hellmann relation, we evaluate sigma commutators for all octet baryons. The small statistical uncertainty and considerably smaller model dependence allows a significantly more precise determination of the pion-nucleon sigma commutator and the strangeness sigma term than hitherto possible, subject to an unresolved issue concerning the lattice scale setting. |
Rights: | © 2013 American Physical Society |
DOI: | 10.1103/PhysRevD.87.074503 |
Grant ID: | FL0992247 DP110101265 |
Published version: | http://dx.doi.org/10.1103/physrevd.87.074503 |
Appears in Collections: | Aurora harvest 4 Chemistry and Physics publications |
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