Measurement of the DA$\hat{I}¦$NE luminosity with the KLOE detector using large angle Bhabha scattering

Abstract

We describe the method of measuring the integrated luminosity of the $e^{+}{e}^{-}$ collider DA$\hat{I}¦$NE, the Frascati $\ddot{I}•-$factory. The measurement is done with the KLOE detector selecting large angle Bhabha scattering events and normalizing them to the effective cross section. The $e^{+}{e}^{-}\to e^{+}{e}^{-}({\hat{I}}^3)$ cross section is calculated using different event generators which account for the $O(\hat{I}\pm )$ radiative initial and final state corrections, and the $\ddot{I}•$ resonance contribution. The accuracy of the measurement is 0.6%, where 0.3% comes from systematic errors related to the event counting and 0.5% from theoretical evaluations of the cross section.

Submitted to Eur. Phys. J. C