Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry
By Hiroshi Ohki, H. Fukaya, S. Hashimoto, T. Kaneko, H. Matsufuru, J. Noaki, T. Onogi, E. Shintani, N. Yamada. 2008
132 citations recorded by the source corpus.
We calculate the nucleon sigma term in two-flavor lattice QCD utilizing the Feynman-Hellman theorem. Both sea and valence quarks are described by the overlap fermion formulation, which preserves exact chiral and flavor symmetries on the lattice. We analyze the lattice data for the nucleon mass using the analytical formulae derived from the baryon chiral perturbation theory. From the data at valence quark mass set different from sea quark mass, we may extract the sea quark contribution to the sigma term, which corresponds to the strange quark content. We find that the strange quark content is much smaller than the previous lattice calculations and phenomenological estimates.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/43f0c1b11233d9cfa4b51e7d79d04e83da37a0f4
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In Nuclear and High Energy Physics
Citations in the corpus
- Dark matter in the inert doublet model after the discovery of a Higgs-like boson at the LHC (2013, methodology): “The values which are widely used come mostly from lattice QCD and chiral perturbation theory calculations [67–70].”
- FLAG Review 2019 (2019, background): “QCDSF 12 [90] 2 A ◦ ⋆ ◦ 37(8)(6) − JLQCD 08B [841] 2 A ◦ 53(2)( −7 ) − △ Two results for σπN are quoted arising from different fit ansätze to the nucleon mass.”
- A SM-like Higgs near 125 GeV in low energy SUSY: a comparative study for MSSM and NMSSM (2012, methodology): “02 [92–94] (fTs denotes the strange quark fraction in the proton mass), and use the package NMSSMTools to implement most of the constraints and to calculate the observables we are interested in.”
- Equivalence Principle Violations and Couplings of a Light Dilaton (2010, background): “Note that the large effects suggested for strange contributions to nucleon masses recently have been bounded by lattice computations to be consistent with zero [50].”