Abstract
We calculate all neutral vector two-point functions in Chiral Perturbation Theory (ChPT) to two-loop 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 one-loop 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.
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ArXiv ePrint: 1609.01573
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Bijnens, J., Relefors, J. Connected, disconnected and strange quark contributions to HVP. J. High Energ. Phys. 2016, 86 (2016). https://doi.org/10.1007/JHEP11(2016)086
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DOI: https://doi.org/10.1007/JHEP11(2016)086