Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/76501
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Nucleon form factors with 2+1 flavor dynamical domain-wall fermions |
Author: | Yamazaki, T. Aoki, Y. Blum, T. Lin, H. Ohta, S. Sasaki, S. Tweedie, R. Zanotti, J. |
Citation: | Physical Review D: Particles, Fields, Gravitation and Cosmology, 2009; 79(11):114505:1-114505:20 |
Publisher: | American Physical Soc |
Issue Date: | 2009 |
ISSN: | 1550-7998 1550-2368 |
Statement of Responsibility: | Takeshi Yamazaki, Yasumichi Aoki, Tom Blum, Huey-Wen Lin, Shigemi Ohta, Shoichi Sasaki, Robert Tweedie and James Zanotti (RBC and UKQCD Collaborations) |
Abstract: | We report our numerical lattice QCD calculations of the isovector nucleon form factors for the vector and axial-vector currents: the vector, induced tensor, axial-vector, and induced pseudoscalar form factors. The calculation is carried out with the gauge configurations generated with Nf=2+1 dynamical domain-wall fermions and Iwasaki gauge actions at β=2.13, corresponding to a cutoff a-1=1.73GeV, and a spatial volume of (2.7fm)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<0.75GeV2. 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, gA/gV, the finite-volume effect scales with a single dimensionless quantity, mπL, the product of the calculated pion mass and the spatial lattice extent. Our results indicate that for this quantity, mπL>6 is required to ensure that finite-volume effects are below 1%. © 2009 The American Physical Society. |
Rights: | © 2009 The American Physical Society |
DOI: | 10.1103/PhysRevD.79.114505 |
Published version: | http://dx.doi.org/10.1103/physrevd.79.114505 |
Appears in Collections: | Aurora harvest 4 Chemistry and Physics publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
hdl_76501.pdf | Published version | 1.26 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.