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: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/91144 https://orcid.org/0000-0002-5713-0039 |
| 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]. |
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