
Johan Bijinens, Johan Relefors
Connected, Disconnected and Strange Quark Contributions to HVP
Abstract
We calculate all neutral vector twopoint functions in Chiral Perturbation Theory (ChPT) to twoloop order and use these to estimate the ratio of disconnected to connected contributions as well as contributions involving the strange quark. We extend the ratio of −1/10 derived earlier in two flavour ChPT at oneloop order to a large part of the higher order contributions and discuss corrections to it. Our final estimate of the ratio disconnected to connected is negative and a few % in magnitude.
LU TP 1649
