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|Title:||The pion's electromagnetic form factor at small momentum transfer in full lattice QCD|
de Lima, H.
|Citation:||The Journal of High Energy Physics, 2008; 2008(7):112-0-112-19|
|Publisher:||Institute of Physics Publishing|
|RBC and UKQCD collaborations, P.A. Boyle, J.M. Flynn, A. Jüttner, C. Kelly, H. Pedroso de Lima, C.M. Maynard, C.T. Sachrajda and J.M. Zanotti|
|Abstract:||We compute the electromagnetic form factor of a "pion" with mass m(sub)π = 330 MeV at low values of Q²≡−q², where q is the momentum transfer. The computations are performed in a lattice simulation using an ensemble of the RBC/UKQCD collaboration's gauge configurations with Domain Wall Fermions and the Iwasaki gauge action with an inverse lattice spacing of 1.73(3) GeV. In order to be able to reach low momentum transfers we use partially twisted boundary conditions using the techniques we have developed and tested earlier. For the pion of mass 330 MeV we find a charge radius given by <r(sub)π²>₃₃₀ (sub)MeV = 0.354(31) fm² which, using NLO SU(2) chiral perturbation theory, translates to a value of <r(sub)π²> = 0.418(31) fm² for a physical pion, in agreement with the experimentally determined result. We confirm that there is a significant reduction in computational cost when using propagators computed from a single time-slice stochastic source compared to using those with a point source; for m(sub)π = 330 MeV and volume (2.74 fm)³ we find the reduction is approximately a factor of 12.|
|Keywords:||Nonperturbative Effects; Electromagnetic Processes and Properties; Lattice QCD|
|Description:||Extent: 21 p.|
|Rights:||Copyright status unknown|
|Appears in Collections:||Chemistry and Physics publications|
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