Measurement of the DA Φ 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
Φ
NE, the Frascati
ϕ−
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
−
→
e
+
e
−
(γ)
cross section is calculated using different event generators which account for the
O(α)
radiative initial and final state corrections, and the
ϕ
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.