Direct photon cross section with conversions at CDF

Direct photon cross section with conversions at CDF

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We present a measurement of the isolated direct photon cross section in p p̄ collisions at √s = 1.8 TeV and |η| < 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 p...

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Main Authors: Acosta, D, Affolder, T, Albrow, MG, Ambrose, D, Amidei, D, Anikeev, K, Antos, J, Apollinari, G, Arisawa, T, Artikov, A, Ashmanskas, W, Azfar, F, Azzi-Bacchetta, P, Bacchetta, N, Bachacou, H, Badgett, W, Barbaro-Galtieri, A, Barnes, V, Barnett, B, Baroiant, S, Barone, M, Bauer, G, Bedeschi, F, Behari, S, Belforte, S
格式: Journal article
語言:English
出版: 2004
實物特徵
總結:We present a measurement of the isolated direct photon cross section in p p̄ collisions at √s = 1.8 TeV and |η| < 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 π0 → γγ and η → γγ 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.

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