Flavor Twisted Boundary Conditions and the Nucleon Vector Current

Details Flavor Twisted Boundary Conditions and the Nucleon Vector Current Flavor Twisted Boundary Conditions and the Nucleon Vector Current

2008-10-08

arxiv.org/abs/0810.1495v1

Phys.Rev.D78:114505,2008

Physics

High Energy Physics

High Energy Physics - Lattice

32 pages, 7 figures

Scientific paper

10.1103/PhysRevD.78.114505

Using flavor twisted boundary conditions, we study nucleon matrix elements of the vector current. We twist only the active quarks that couple to the current. Finite volume corrections due to twisted boundary conditions are determined using partially twisted, partially quenched, heavy baryon chiral perturbation theory, which we develop for the graded group SU(7|5). Asymptotically these corrections are exponentially small in the volume, but can become pronounced for small twist angles. Utilizing the Breit frame does not mitigate volume corrections to nucleon vector current matrix elements. The derived expressions will allow for better controlled extractions of the isovector magnetic moment and the electromagnetic radii from simulations at zero lattice momentum. Our formalism, moreover, can be applied to any nucleon matrix elements.

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