Hadronic form factors in lattice QCD at small and vanishing momentum transfer

Flynn, J.M., Juttner, A., Sachrajda, C.T., Boyle, P.A. and Zanotti, J.M (2007) Hadronic form factors in lattice QCD at small and vanishing momentum transfer Journal of High Energy Physics, 5, pp. 16-37. (doi:10.1088/1126-6708/2007/05/016).


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The introduction of partially twisted boundary conditions allows weak and electromagnetic form factors to be evaluated at specified values of the hadronic momenta (and hence momentum transfers) in lattice simulations. We present and demonstrate this technique for the computation of the K ? ? semileptonic form factor at zero momentum transfer and for the electromagnetic form factor of the pion at arbitrarily small momentum transfers. These exploratory computations are carried out in full QCD with 3 flavours of sea quarks, but with only two values of mu = md which limits our ability to perform the chiral extrapolations. The results should therefore be viewed primarily as a demonstration of the feasibility of the method. For the K ? ? form factor we compare the new technique to the conventional approach and for the pion form factor we assess our results for very small momentum transfer with the help of chiral perturbation theory.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1088/1126-6708/2007/05/016
Keywords: kaon physics, electromagnetic processes and properties, weak decays, lattice QCD
ePrint ID: 57115
Date :
Date Event
Date Deposited: 14 Aug 2008
Last Modified: 16 Apr 2017 17:40
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/57115

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