Boram Yoon

Nucleon Charges and Electromagnetic Form Factors from 2+1+1-Flavor Lattice QCD

We present lattice-QCD results on the nucleon isovector axial, scalar and tensor charges, the isovector electromagnetic Dirac and Pauli form factors, and the connected parts of the isoscalar charges. The calculations have been done using two ensembles of HISQ lattices generated by the MILC Collaboration with 2+1+1 dynamical flavors at a lattice spacing of 0.12 fm and with light-quark masses corresponding to pions with masses 310 and 220 MeV. We perform a systematic study including excited-state degrees of freedom and examine the dependence of the extracted nucleon matrix elements on source-sink separation. This study demonstrates with high-statistics data that including excited-state contributions and generating data at multiple separations is necessary to remove contamination that would otherwise lead to systematic error. We also determine the renormalization constants of the associated quark bilinear operators in the RI-sMOM scheme and make comparisons of our renormalized results with previous dynamical-lattice calculations.

Axial, scalar, and tensor charges of the nucleon from 2+1+1-flavor lattice QCD

We present results for the isovector axial, scalar and tensor charges

Isovector and Isoscalar Tensor Charges of the Nucleon from Lattice QCD

g^{u-d}_A

BK using HYP-smeared staggered fermions in Nf = 2 + 1 unquenched QCD

,

Kaon B parameter from improved staggered fermions in N(f)=2+1 QCD.

g^{u-d}_S

Dimension-5 CP -odd operators: QCD mixing and renormalization

and

Neutral kaon mixing from new physics: matrix elements in

g^{u-d}_T

N_f=2+1

of the nucleon needed to probe the Standard Model and novel physics. The axial charge is a fundamental parameter describing the weak interactions of nucleons. The scalar and tensor charges probe novel interactions at the TeV scale in neutron and nuclear

lattice QCD

\beta

Axial-vector form factors of the nucleon from lattice QCD

-decays, and the flavor-diagonal tensor charges