Nucleon charges and form factors using clover and HISQ ensembles

Sungwoo Park; Tanmoy Bhattacharya; Rajan Gupta; Yong Chull Jang; Balint Joo; Huey Wen Lin; Boram Yoon

Nucleon charges and form factors using clover and HISQ ensembles

Sungwoo Park, Tanmoy Bhattacharya, Rajan Gupta, Yong Chull Jang, Balint Joo, Huey Wen Lin, Boram Yoon

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

We present high statistics (O(2 ×10⁵) measurements) preliminary results on (i) the isovector charges, g^u_A⁻_,S^d_,T, and form factors, G^u_E^−d(Q²), G^u_M^−d(Q²), G_A^u−d(Q²), G^eu_P^−d(Q²), G^u_P^−d(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, g_A^u^d_S^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 g^u_A^d_T^,s will update the results given in Refs. [3, 4]. The estimates for g_S^u,d,s and σ_Nπ 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.

Original language	English
Article number	136
Journal	Proceedings of Science
Volume	363
State	Published - 2019
Externally published	Yes
Event	37th International Symposium on Lattice Field Theory, LATTICE 2019 - Wuhan, China Duration: Jun 16 2019 → Jun 22 2019

Funding

Acknowledgments: We thank the MILC collaboration for sharing their 2 + 1 + 1-flavor HISQ ensembles. Simulations were carried out on computer facilities at (i) the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported under Contract No. DE-AC02-05CH11231; and, (ii) the Oak Ridge Leadership Computing Facility supported by the Office of Science of the DOE under Contract No. DE-AC05-00OR22725; (iii) the USQCD Collaboration, which are funded by the Office of Science of the U.S. Department of Energy, and (iv) Institutional Computing at Los Alamos National Laboratory. T. Bhattacharya and R. Gupta were partly supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Contract No. DE-AC52-06NA25396. S. Park, T. Bhattacharya, R. Gupta, Y.-C. Jang and B. Yoon were partly supported by the LANL LDRD program.

Funders	Funder number
Office of Science	DE-AC02-05CH11231
LANL LDRD
U.S. Department of Energy
Oak Ridge National Laboratory
U.S. Department of Energy	DE-AC05-00OR22725
Office of Science
Los Alamos National Laboratory
High Energy Physics	DE-AC52-06NA25396
National Energy Research Scientific Computing Center

Cite this

@article{d3a01c1fb57d46639cc431396ef6d29a,

title = "Nucleon charges and form factors using clover and HISQ ensembles",

abstract = "We present high statistics (O(2 ×105) measurements) preliminary results on (i) the isovector charges, guA−,Sd,T, and form factors, GuE−d(Q2), GuM−d(Q2), GAu−d(Q2), GeuP−d(Q2), GuP−d(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, gAudSsT, 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 guAdT,s will update the results given in Refs. [3, 4]. The estimates for gSu,d,s 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.",

author = "Sungwoo Park and Tanmoy Bhattacharya and Rajan Gupta and Jang, {Yong Chull} and Balint Joo and Lin, {Huey Wen} and Boram Yoon",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).; 37th International Symposium on Lattice Field Theory, LATTICE 2019 ; Conference date: 16-06-2019 Through 22-06-2019",

year = "2019",

language = "English",

volume = "363",

journal = "Proceedings of Science",

issn = "1824-8039",

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TY - JOUR

T1 - Nucleon charges and form factors using clover and HISQ ensembles

AU - Park, Sungwoo

AU - Bhattacharya, Tanmoy

AU - Gupta, Rajan

AU - Jang, Yong Chull

AU - Joo, Balint

AU - Lin, Huey Wen

AU - Yoon, Boram

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2019

Y1 - 2019

N2 - We present high statistics (O(2 ×105) measurements) preliminary results on (i) the isovector charges, guA−,Sd,T, and form factors, GuE−d(Q2), GuM−d(Q2), GAu−d(Q2), GeuP−d(Q2), GuP−d(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, gAudSsT, 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 guAdT,s will update the results given in Refs. [3, 4]. The estimates for gSu,d,s 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.

AB - We present high statistics (O(2 ×105) measurements) preliminary results on (i) the isovector charges, guA−,Sd,T, and form factors, GuE−d(Q2), GuM−d(Q2), GAu−d(Q2), GeuP−d(Q2), GuP−d(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, gAudSsT, 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 guAdT,s will update the results given in Refs. [3, 4]. The estimates for gSu,d,s 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.

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M3 - Conference article

AN - SCOPUS:85094781090

SN - 1824-8039

VL - 363

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 136

T2 - 37th International Symposium on Lattice Field Theory, LATTICE 2019

Y2 - 16 June 2019 through 22 June 2019

ER -

Nucleon charges and form factors using clover and HISQ ensembles

Abstract

Funding

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