electron reconstructionwith bhabha events

P.Azzurri – WWTF 01/10/03

• CLAS 24• two leading tracks with m(1,2)>50GeV/c2• both with electron id. a la W• |cos(theta)|<0.90

Work in progress …Plenty of technical problems to adapt CN code to Bhabha events !

electron reconstruction on bhabhas 2P.Azzurri WWTF 01/10/03

Electron energy reconstruction

DATA-MC bias :1. electron momentum: +29[80] MeV {E/Eb=0.90} 2. + brems correction: +410[47] MeV {E/Eb=0.958} 3. + fsr correction : +420[45] MeV {E/Eb=0.965}

electron reconstruction on bhabhas 3P.Azzurri WWTF 01/10/03

brem corr fsr corr

momentumfinal energy

Electron energy reconstruction