17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

New determination of the e+e- hadronic cross section below 1 GeV with KLOE

20 Jul 2013, 12:00
20m
F2 (KTH Campus)

F2

KTH Campus

Talk presentation Top and Electroweak Physics Top and Electroweak Physics

Speaker

Graziano Venanzoni (Istituto Nazionale Fisica Nucleare (IT))

Description

We have recently completed and published the third independent measurement of the e+e- --> pi+pi-(gamma) cross section below 1 GeV, which is particularly important to test the Standard Model calculation for the (g-2) of the muon, where a long standing 3 sigma discrepancy is observed. The previous measurements, with the photon emitted at small and large angle, respectively, were normalized to the DAPHNE luminosity using large angle Bhabha scattering. In the new analysis the pion form factor is obtained directly from the pi+pi-gamma(gamma)/mu+mu-gamma(gamma) ratio, with significantly different systematic effects. In the overlap region there is a very good agreement among different KLOE measurements.

Primary author

Fabio Bossi (Laboratori Nazionali di Frascati (LNF))

Presentation Materials