The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Nucleon isovector form factors from 2+1-flavor domain-wall QCD at physical mass

9 Aug 2022, 15:00

20m

CP1-HSZ/1.002 (CP1-HSZ) - HS6 (CP1-HSZ)

Oral Presentation Hadron Structure Hadron Structure

Speaker

Shigemi Ohta (IPNS, KEK)

Description

Nucleon isovector form factors calculated on a 2+1-flavor domain-wall-fermions ensemble with strange and degenerate up and down quarks at physical mass and lattice cut off, $a^{-1}$, of about 1.730(4) GeV, will be presented. The ensemble was generated jointly by RBC and UKQCD collaborations with a spatial extent of $48a$ or about 5.5 fm. The form factors are calculated in collaboration with LHP as well. The resulting shape parameters of the form factors such as vector-charge mean squared radius, $⟨r_1^2⟩$, or anomalous magnetic moment, $F_2(0)$ appear less dependent on possible excited-state contaminations than the corresponding charges. This is likely because of larger statistical fluctuations at finite momentum transfer. For example, preliminary estimates are $⟨r_1^2⟩\sim 0.142(13){\text{fm}}^2$ and $F_2(0)\sim 3.22(8)$.

Presentation materials

ohta.pdf