Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Hadron Structure and Spectroscopy VIII
HK 42.5: Talk
Thursday, April 2, 2020, 15:30–15:45, J-HS A
Dispersive Calculation of the Rho Meson Mass Difference — •Philip Lüghausen — Technische Universität München
The mass difference between charged and neutral rho mesons is a critical parameter when accounting for chiral symmetry breaking in high-precision calculations. For a phenomenological determination, we employ a dispersive formalism analogously to the Cottingham formula. A resonance model is used to obtain numerical results. The current PDG estimate of Mρ± − Mρ0 = 0.7±0.8 MeV is compatible with our result in the range of 0.8 … 1.4 MeV.