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Pion mass difference from vacuum polarization

Presenter: Eigo Shintani — KEK

E. Shintani, H. Fukaya, S. Hashimoto, J. Noaki, T. Onogi, N. Yamada (for JLQCD Collaboration)

We report on a calculation of the π+0 mass splitting, obtained from the vacuum polarization tensors using the DGLMY (Das-Gralnik-Low-Mathur-Young) sum rule. Since the reliable calculation requires exact chiral symmetry, we use the overlap fermion for both sea and valence quarks.