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+ | ====== TTP08-26 Two-loop QED hadronic corrections to Bhabha scattering ====== | ||
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+ | < | ||
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+ | )$ and from irreducible ones where the vacuum polarization appears in a loop representing ve | ||
+ | rtex or box diagrams. The second case can be treated by using dispersion relations with a we | ||
+ | ight function proportional to the $R$-ratio as measured in electron-positron annihilation in | ||
+ | to hadrons and kernels that can be calculated perturbatively. We present simple analytical f | ||
+ | orms for the kernels and, using two convenient parametrizations for the function $R(s)$, num | ||
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+ | g corrections resulting from light and heavy lepton loops and we find perfect agreement with | ||
+ | previous calculations. For the hadronic correction our result are in good agreement with a | ||
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+ | </ | ||
+ | |**Johann H. K& | ||
+ | |** Nucl.Phys. | ||
+ | | {{preprints: | ||
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