Masses, Decay Constants and Electromagnetic Form-factors with Twisted Boundary Conditions

Understand

Using Chiral Perturbation Theory at one-loop 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 pseudo-scalar octet masses, axial-vector and pseudo-scalar decay constants and electromagnetic form-factors.
• We show how the Ward identities are satisfied using the momentum dependent masses and the non-zero vacuum-expectation-values values for the electromagnetic (vector) currents.