Nucleon charges and form factors using clover and HISQ ensembles
S. Park*,
T. Bhattacharya,
R. Gupta,
Y.C. Jang,
B. Joo,
H.W. Lin and
B. Yoon*: corresponding author
Pre-published on:
February 06, 2020
Published on:
August 27, 2020
Abstract
We present high statistics (O(2×105) measurements) preliminary results on (i) the isovector charges, gu−dA,S,T, and form factors, Gu−dE(Q2), Gu−dM(Q2), Gu−dA(Q2), ˜Gu−dP(Q2), Gu−dP(Q2), on six 2+1-flavor Wilson-clover ensembles generated by the JLab/W&M/LANL/MIT collaboration with lattice parameters given in Table 1. Examples of the impact of using different estimates of the excited state spectra are given for the clover-on-clover data, and as discussed in [1], the biggest difference on including the lower energy (close to Nπ and Nππ) states is in the axial channel. (ii) Flavor diagonal axial, tensor and scalar charges, gu,d,sA,S,T, are calculated with the clover-on-HISQ formulation using nine 2+1+1-flavor HISQ ensembles generated by the MILC collaboration [2] with lattice parameters given in Table 2. Once finished, the calculations of gu,d,sA,T will update the results given in Refs. [3,4]. The estimates for gu,d,sS and σNπ are new. Overall, a large part of the focus is on understanding the excited state contamination (ESC), and the results discussed provide a partial status report on developing defensible analyses strategies that include contributions of possible low-lying excited states to individual nucleon matrix elements.
DOI: https://doi.org/10.22323/1.363.0136
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