
Johan Bijnens, Johan Relefors
Masses, Decay Constants and Electromagnetic Formfactors with Twisted Boundary Conditions
Abstract
Using Chiral Perturbation Theory at oneloop we analyze the consequences of twisted boundary conditions. We point out that due to the broken Lorentz and reflection symmetry a number of unexpected terms show up in the expressions. We explicitly discuss the pseudoscalar octet masses, axialvector and pseudoscalar decay constants and electromagnetic formfactors. We show how the Ward identities are satisfied using the momentum dependent masses and the nonzero vacuumexpectationvalues values for the electromagnetic (vector) currents. Explicit expressions at oneloop are provided and an appendix discusses the needed oneloop twisted finite volume integrals.
LU TP 1403
