The pion's electromagnetic form factor at small momentum transfer in full lattice QCD


Boyle, P.A., Flynn, J.M., Jüttner, A., Kelly, C., de Lima, H.Pedroso, Maynard, C.M., Sachrajda, C.T. and Zanotti, J.M. RBC and UKQCD collaborations (2008) The pion's electromagnetic form factor at small momentum transfer in full lattice QCD. Journal of High Energy Physics, 2008, (7), 112-[21pp]. (doi:10.1088/1126-6708/2008/07/112).

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Description/Abstract

We compute the electromagnetic form factor of a ``pion" with mass mπ = 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 rπ2330 MeV = 0.354(31) fm2 which, using NLO SU(2) chiral perturbation theory, translates to a value of rπ2 = 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 mπ = 330 MeV and volume (2.74 fm)3 we find the reduction is approximately a factor of 12

Item Type: Article
ISSNs: 1126-6708 (print)
1029-8479 (electronic)
Keywords: lattice qcd, electromagnetic processes and properties, nonperturbative effects
Subjects: Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy > Southampton High Energy Physics
ePrint ID: 143313
Date Deposited: 26 May 2010 08:22
Last Modified: 27 Mar 2014 19:05
URI: http://eprints.soton.ac.uk/id/eprint/143313

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