Conversions are an excellent source of soft electrons and can be used to study the soft electron efficiency. We study here the efficiency of the Calorimeter cuts which includes the electromagnetic calorimeter, the Central Shower Max (CES) and the Central Pre Radiator (CPR).The conversions are selected by looking for two tracks originating from a common vertex and by cutting on their separation in theta and phi. We cut on Delta(cot(theta)) and the separation between the tangents to the tracks at the point where they meet in the X-Y plane.
The Calorimeter efficiency is calculated for golden conversions i.e. conversions that convert above 20 cm. i.e. from the ISL and beyond. If we look at conversions that don't have a matched electromagnetic cluster i.e. either they dont extrapolate to the Calorimeter or they dont find any cluster with energy above 1.5 GeV, then these clearly populate the lower radii as seen in this figure.
The calorimeter cuts are imposed only on the high Pt partner or the trigger leg. We also demand that the partners extrapolate to different wedges. The Calorimeters variables are plotted for golden conversions and cuts are chosen accordingly.

Details about the data sample used:
Data sample
run numbers Used
Cuts and Efficiency Numbers.

Monitored variables:

	Conversion Track PT	[ PS ]
	Conversion Track PT which extrapolate to same/different wedges	[ PS ]
	Conversion Quality	[ PS ]
	Conversion Fitted Radius (CTVMFT)	[ PS ]
	EM Track Match	[ PS ]
	EM Object Variables	[ PS ]
	CES Object Variables	[ PS ]
	CPR Object Variables	[ PS ]
	CPR Reconstruction Efficiency	[ PS ]