Pion electromagnetic form factor from full lattice QCD

Koponen, J., Bursa, F., Davies, C. , Donald, G. and Dowdall, R. (2013) Pion electromagnetic form factor from full lattice QCD. In: 31st International Symposium on Lattice Field Theory LATTICE 2013, Mainz, Germany, 29 July – 3 Aug 2013, pp. 1-7.

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We present preliminary results from the first calculation of the pion electromagnetic form factor at physical light quark masses. This form factor parameterises the deviations from the behaviour of a point-like particle when a photon hits the pion. These deviations result from the internal structure of the pion and can thus be calculated in QCD. We use three sets (different lattice spacings) of n_f=2+1+1 lattice configurations generated by the MILC collaboration. The Highly Improved Staggered Quark formalism (HISQ) is used for all of the sea and valence quarks. Using lattice configurations with u/d quark masses very close to the physical value is an advantage, as we avoid the chiral extrapolation. We study the shape of the vector (f_+) form factor in the q^2 range from 0 to -0.12 GeV^2 and extract the mean square radius, <r^2_v>. The shape of the vector form factor and the resulting radius is compared with experiment.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Dowdall, Dr Rachel and Koponen, Dr Jonna and Bursa, Dr Francis and Davies, Professor Christine and Donald, Dr Gordon
Authors: Koponen, J., Bursa, F., Davies, C., Donald, G., and Dowdall, R.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Copyright Holders:Copyright © 2013 The Authors
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY