Speaker
Description
The QED Bhabha interaction is the most precisely predicted approaching 10^-4 precision as the reference channel for Luminosity measurement at the e+e- collider experiments. The BHLUMI generator developed at LEP is employed for the LumiCal proposed for the CEPC Higgs factory requiring minimum systematics errors to 10^-3 at Higgs mass and 10^-4 at Z-pole. Bhabha events shall be measured to interpret the deviation due to radiative photons. Distribution and detection of photons are interpreted for e/gamma identification with the LumiCal detector modules. The BHWIDE generator baed also on the YFS exponentiation mechanism is also studied for the center of mass energy at the 10 GeV level. Radiative Bhabha detection has not being measured to betterh than 1%. By measuring radiative photons the Bhabha interaction can be measured for the NLO interpretation,
