Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

f0(1370) Controversy from Dispersive Meson-Meson Scattering Data Analyses

Jun 5, 2023, 2:50 PM
DAD - Room 5L (Genova, Italy)

DAD - Room 5L

Genova, Italy

Invited Light meson spectroscopy Light meson spectroscopy


Jose Pelaez (Universidad Complutense de Madrid)


We establish the existence of the long-debated f0(1370) resonance in the dispersive analyses of meson-meson scattering data. For this, we present a novel approach using forward dispersion relations, valid for generic inelastic resonances. We find its pole at (1245±40)-i(300-70+30)  MeV in ππ scattering. We also provide the couplings as well as further checks extrapolating partial-wave dispersion relations or with other continuation methods. A pole at (1380-60+70)-i(220-70+80)  MeV also appears in the ππ→KK¯ data analysis with partial-wave dispersion relations. Despite settling its existence, our model-independent dispersive and analytic methods still show a lingering tension between pole parameters from the ππ and KK¯ channels that should be attributed to data. Reference: Phys.Rev.Lett. 130 (2023) 5, 051902

Primary author

Jose Pelaez (Universidad Complutense de Madrid)


Dr Arkaitz Rodas (Jefferson Lab) Dr Jacobo Ruiz de Elvira (Universidad Complutense de Madrid)

Presentation materials