Nucleon form factors with 2+1 flavor dynamical domain-wall fermions [electronic resource]
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| Online Access: |
Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2009.
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| Subjects: |
| Abstract: | We report our numerical lattice QCD calculations of the isovector nucleon form factors for the vector and axialvector currents: the vector, induced tensor, axialvector, and induced pseudoscalar form factors. The calculation is carried out with the gauge configurations generated with N{sub f} = 2+1 dynamical domain wall fermions and Iwasaki gauge actions at β = 2.13, corresponding to a cutoff a⁻¹ = 1.73 GeV, and a spatial volume of (2.7 fm)³. The up and down quark masses are varied so the pion mass lies between 0.33 and 0.67 GeV while the strange quark mass is about 12% heavier than the physical one. We calculate the form factors in the range of momentum transfers, 0.2 < q² < 0.75 GeV². The vector and induced tensor form factors are well described by the conventional dipole forms and result in significant underestimation of the Dirac and Pauli mean-squared radii and the anomalous magnetic moment compared to the respective experimental values. We show that the axial-vector form factor is significantly affected by the finite spatial volume of the lattice. In particular in the axial charge, g{sub A}/g{sub V}, the finite volume effect scales with a single dimensionless quantity, m{sub π}L, the product of the calculated pion mass and the spatial lattice extent. Our results indicate that for this quantity, m{sub π} L > 6 is required to ensure that finite volume effects are below 1% |
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| Item Description: | Published through SciTech Connect. 06/01/2009. "jlab-thy-09-932" " doe/or/23177-0680" " arxiv:0904.2039" Physical Review. D, Particles, Fields, Gravitation and Cosmology 79 11 ISSN 1550-7998; PRVDAQ FT. Takeshi Yamazaki, Yasumichi Aoki, Tom Bl. |
| Physical Description: | 114505 : digital, PDF file. |