24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Isovector Axial Charge with Current Improvement

26 Jul 2016, 20:00
1h
Highfield Campus, University of Southampton

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Poster Hadron Structure Poster

Speaker

Dr YIBO Yang (university of Kentucky)

Description

We employ dimension 4 operators to improve the local vector and axial vector currents, as the leading order approximation of the lattice conserved current, and then calculate the nucleon iso-vector axial coupling $g^3_A$ using overlap valence on Domain Wall Fermion sea. Using the equality of $g^3_A$ from $A_i$ and $A_4$ components of the axial-vector current as a normalization condition in addition to axial Ward identity, we find two to three percent increase of $g^3_A$ towards the experimental value. The excited state contamination has been taken into account with three time separations between the source and sink. The improved axial charges $g_A^{IM}(24I)=1.188(7)$, $g_A^{IM}(32I)=1.177(9)$ are obtained on $24^3\times 64$ and $32^3\times 64$ lattices at the unitary point where the pion masses are $330$ MeV and $300$ MeV respectively.

Primary author

Dr Jian Liang (University of Kentucky)

Co-authors

Prof. Andrei Alexandru (The George Washington University) Prof. Keh-Fei Liu (University of Kentucky) Raza Sufian (University of Kentucky, United States) Prof. Terrence Draper (University of Kentucky) Dr YIBO Yang (university of Kentucky)

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