Nucleon electromagnetic form factors in the continuum limit from ( 2 + 1 + 1 )-flavor lattice QCD

Jang, Yong-Chull; Gupta, Rajan; Lin, Huey-Wen; Yoon, Boram; Bhattacharya, Tanmoy

doi:10.1103/PhysRevD.101.014507

Title: Nucleon electromagnetic form factors in the continuum limit from ( $2 + 1 + 1$ )-flavor lattice QCD

Journal Article · Thu Jan 23 00:00:00 EST 2020 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.101.014507· OSTI ID:1593500

Jang, Yong-Chull;

; Lin, Huey-Wen; Yoon, Boram;

We present results for the isovector (p–n) electromagnetic form factors of the nucleon using 11 ensembles of gauge configurations generated by the MILC Collaboration using the highly improved staggered quark action with 2+1+1 dynamical flavors. These ensembles span four lattice spacings a ≈ 0.06, 0.09, 0.12 and 0.15 fm and three values of the light-quark masses corresponding to the pion masses M_π ≈ 135, 225 and 315 MeV. High-statistics estimates using the truncated-solver method allow us to quantify various systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume and light-quark masses. We analyze the Q² dependence of the form factors calculated over the range 0.05 ≲ Q² ≲ 1.4 GeV² using both the model-independent z expansion and the dipole Ansatz. Our final estimates, using the z-expansion fit, for the isovector root-mean-square radius of nucleon are r_E = 0.769(27)(30) fm, r_M = 0.671(48)(76) fm and μ^p–n = 3.939(86)(138) Bohr magneton. The first error is the combined uncertainty from the leading-order analysis, and the second is an estimate of the additional uncertainty due to using the leading-order chiral-continuum-finite-volume fits. The estimates from the dipole Ansatz, r_E = 0.765(11)(8) fm, r_M = 0.704(21)(29) fm an μ^p–n = 3.975(84)(125) Bohr magneton, are consistent with those from the z expansion but with smaller errors. Our analysis highlights three points. First, all our data for form factors from the 11 ensembles and existing lattice data on, or close to, physical mass ensembles from other collaborations collapse more clearly onto a single curve when plotted versus Q²/M$$^2_N$$ as compared to Q² with the scale set by quantities other than MN. Here, the difference between these two ways of analyzing the data is indicative of discretization errors, some of which presumably cancel when the data are plotted versus Q²/M$$^2_N$$. Second, the size of the remaining deviation of this common curve from the Kelly curve is small and can be accounted for by statistical and possible systematic uncertainties. Third, to improve lattice estimates for < r$$^2_E$$ >, < r$$^2_M$$ > and μ, high–statistics data for Q² < 0.1 GeV² are needed.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Contributing Organization:: PNDME Collaboration

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231; AC05-00OR22725; AC52-06NA25396; PHY 1653405

OSTI ID:: 1593500

Alternate ID(s):: OSTI ID: 1599034

Report Number(s):: LA-UR-19-25275; PRVDAQ; 014507

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 101 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Title: Nucleon electromagnetic form factors in the continuum limit from ( 2 + 1 + 1 )-flavor lattice QCD

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Title: Nucleon electromagnetic form factors in the continuum limit from ( $2 + 1 + 1$ )-flavor lattice QCD