Direct photon cross section with conversions at CDF - INSPIRE

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Direct photon cross section with conversions at CDF

CDF

Collaboration

Apr, 2004

11 pages

Published in:

Phys.Rev.D 70 (2004) 074008

e-Print:

hep-ex/0404022 [hep-ex]

DOI:

10.1103/PhysRevD.70.074008

Report number:

FERMILAB-PUB-04-044-E,
FERMILAB-PUB-04-044E

Experiments:

FNAL-E-0830

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Abstract: (arXiv)

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.

Note:

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

anti-p p: colliding beams
anti-p p: inclusive reaction
photon: direct production
photon: particle identification
electron: pair production
background
pseudoscalar meson: radiative decay
differential cross section: transverse momentum
CDF
experimental results

References(12)

Figures(8)

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