Nuclear Science Abstracts

Nuclear Science Abstracts
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Total Pages: 890
Release: 1970-05
Genre: Nuclear energy
ISBN:

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Direct Photon Center-of-Mass Angular Distributions in $p\bar{p}$ Collisions at $\sqrt{s}$

Direct Photon Center-of-Mass Angular Distributions in $p\bar{p}$ Collisions at $\sqrt{s}$
Author:
Publisher:
Total Pages: 183
Release: 1992
Genre:
ISBN:

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The center-of-mass angular distribution of direct photon events, resulting from proton-antiproton collisions at a center-of-mass energy of 1.8 TeV, as measured by the Collider Detector at Fermi lab (CDF) during the 1988-1089 experimental run, is presented. The direct photon events are identified primarily through the direct photon's characteristic isolation from other particles. The main source of background is from rare fragmentation of QCD partons into single isolated neutral mesons, which decay into two or more photons. The background is removed statistically by exploitation of tile expected difference in the resulting shower profiles. The resulting angular distribution for direct photons, in the transverse momentum range from 22 to 45 Ge V is found to agree favorably with the predictions of Quantum Cbromodynamics (QCD) for an interaction with a fermion (spin 1/2) propagator.