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Disconnected quark loop contributions to nucleon observables in lattice QCD

Abdel-Rehim, A
; 
Alexandrou, C
; 
Constantinou, M
; 
Drach, V
; 
Hadjiyiannakou, K
; 
Jansen, K
; 
Koutsou, G
; 
Vaquero, A
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Journal Article
Date
2014-02-03
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Subject
hep-lat
 hep-lat
 hep-ph
 nucl-th
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http://hdl.handle.net/20.500.12613/5892
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1310.6339v2.pdf
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DOI
10.1103/PhysRevD.89.034501
Abstract
We perform a high statistics calculation of disconnected fermion loops on graphics processing units for a range of nucleon matrix elements extracted using lattice QCD. The isoscalar electromagnetic and axial vector form factors, the sigma terms and the momentum fraction and helicity are among the quantities we evaluate. We compare the disconnected contributions to the connected ones and give the physical implications on nucleon observables that probe its structure. © 2014 American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology
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