The intrinsic strangeness and charm of the nucleon using improved staggered fermions

Doug Toussaint (for the MILC Collaboration); Walter Freeman

The intrinsic strangeness and charm of the nucleon using improved staggered fermions

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arxiv 1204.3866 v1 pith:SGSWHKL2 submitted 2012-04-17 hep-lat

Walter Freeman , Doug Toussaint (for the MILC Collaboration) This is my paper · ORCID

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keywords charmintrinsicmethodnucleoncalculationheavyhisqimproved

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We calculate the intrinsic strangeness of the nucleon, <N|ss|N> - <0|ss|0>, using the MILC library of improved staggered gauge configurations using the Asqtad and HISQ actions. Additionally, we present a preliminary calculation of the intrinsic charm of the nucleon using the HISQ action with dynamical charm. The calculation is done with a method which incorporates features of both commonly-used methods, the direct evaluation of the three-point function and the application of the Feynman- Hellman theorem. We present an improvement on this method that further reduces the statistical error, and check the result from this hybrid method against the other two methods and find that they are consistent. The values for <N|ss|N> and <N|cc|N> found here, together with perturbative results for heavy quarks, show that dark matter scattering through Higgs-like exchange receives roughly equal contributions from all heavy quark flavors.

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Nucleon axial, tensor and scalar charges and $\sigma$-terms in lattice QCD
hep-lat 2019-09 conditional novelty 6.0 of 10

Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.

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