We present a measurement of the isolated direct photon cross
section in p anti-p collisions at s**(1/2) = 1.8 TeV and |eta| < 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 pi0 --> 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 p(t) is poorly described by next-to-leading-order QCD predictions,
but agrees with previous CDF measurements.
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Updated: Thursday, 2004 October 28 10:54:09 CDT automatically from input from "Carol I. Picciolo"