Details

Autor(en) / Beteiligte

• Bussone, Andrea
• Della Morte, Michele
• Janowski, Tadeusz
• Pena Ruano, C.
• Della Morte, M.
• Fritzsch, P.
• Gámiz Sánchez, E.

Titel

Electromagnetic corrections to the hadronic vacuum polarization of the photon within QED L and QED M

Ist Teil von

• EPJ Web of conferences, 2018, Vol.175, p.6005

Erscheinungsjahr

2018

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We compute the leading QED corrections to the hadronic vacuum polarization (HVP) of the photon, relevant for the determination of leptonic anomalous magnetic moments, a l . We work in the electroquenched approximation and use dynamical QCD configurations generated by the CLS initiative with two degenerate flavors of nonperturbatively O( a )-improved Wilson fermions. We consider QED L and QED M to deal with the finite-volume zero modes. We compare results for the Wilson loops with exact analytical determinations. In addition we make sure that the volumes and photon masses used in QED M are such that the correct dispersion relation is reproduced by the energy levels extracted from the charged pions two-point functions. Finally we compare results for pion masses and the HVP between QED L and QED M . For the vacuum polarization, corrections with respect to the pure QCD case, at fixed pion masses, turn out to be at the percent level.