Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses m[subscript π] = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled to smeared gauge fields, as used by the Budapest-Marseille-Wuppertal Collaboration. Particular attention is gi...
Main Authors: | , , , , , |
---|---|
Other Authors: | , , |
Format: | Article |
Language: | English |
Published: |
American Physical Society,
2014-10-21T19:43:15Z.
|
Subjects: | |
Online Access: | Get fulltext |
Summary: | We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses m[subscript π] = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled to smeared gauge fields, as used by the Budapest-Marseille-Wuppertal Collaboration. Particular attention is given to the removal of the effects of excited-state contamination by calculations at three source-sink separations and the use of the summation and generalized pencil-of-function methods. The combination of a calculation at the nearly physical mass m[subscript π] = 149 MeV in a large spatial volume (m[subscript π]L[subscript s] = 4.2) and the removal of excited-state effects yields agreement with experiment for the electric and magnetic form factors G[subscript E](Q[superscript 2]) and G[subscript M](Q[superscript 2]) up to Q[superscript 2] = 0.5 GeV[superscript 2]. United States. Dept. of Energy. Office of Nuclear Physics (Grant DE-FG02-94ER40818) |
---|