Direct photon cross section with conversions at CDF

0.9 using data collected between 1994 and 1995 by the Collider Detector at Fermilab (CDF). The measurement is based on events where the photon converts into an electron-positron pair in the material of the inner detector, resulting in a two track event signature. To remove pi 0--> gamma gamma and eta --> gamma gamma events from the data we use a new background subtraction technique which takes advantage of the tracking information available in a photon conversion event. We find that the shape of the cross section as a function of photon pT is poorly described by next-to- leading-order QCD predictions, but agrees with previous CDF measurements.

Duke Scholars

Author Alfred T. Goshaw Physics

Author Mark C. Kruse Physics

Author Seog Oh Physics