Direct photon cross section with conversions at CDF

Details Direct photon cross section with conversions at CDF Direct photon cross section with conversions at CDF

2004-04-19

arxiv.org/abs/hep-ex/0404022v2

Phys.Rev.D70:074008,2004

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 6 figures, revtex4, to be submitted to PRD

Scientific paper

10.1103/PhysRevD.70.074008

We present a measurement of the isolated direct photon cross section in p-pbar collisions at sqrt(s) = 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 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 pT is poorly described by next-to-leading-order QCD predictions, but agrees with previous CDF measurements.

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