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Languages : en
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Diphoton Production in Pbar P Collisions at Radicals
Author: Diphoton Production in P[bar P] Collisions At[radical]
![Diphoton Production in P[bar P] Collisions At[radical] PDF](https://books.google.com/books/content/images/frontcover/D1vyjwEACAAJ?fife=w80-h100)
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Languages : en
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We present measurements of the inclusive[gamma][gamma] cross section (as a function of invariant mass and photon[epsilon][sub[tau]]), in p[bar p] collisions at[radical]s= 1.8 TeV, made using the D0 detector at the Fermilab Tevatron collider. The next is leading order (NLO) QCD prediction is found to be in good agreement with the data. The effects of invariant mass and diphoton balance cuts, which test the next-to-leading order contributions to the cross section, are investigated. We also compare the distribution of[kappa][sub[tau]] between samples of diphotons and highly electromagnetic jets, and find that the NLO QCD prediction models the shape of the[gamma][gamma][kappa][sub[tau]] distribution quite well.
The B[bar B] Production Cross Section and Correlations in P[bar P] Collisions At[radical]
![The B[bar B] Production Cross Section and Correlations in P[bar P] Collisions At[radical] PDF](https://books.google.com/books/content/images/frontcover/oOqUDAEACAAJ?fife=w80-h100)
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Languages : en
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The authors present measurements of the b[bar b] production cross section and angular correlations between the b and[bar b]-quarks in p[bar p] collisions using the D0 detector at the Fermilab Tevatron operating at[radical]s= 1.8 TeV. The b-quark production cross section for[vert-bar]y[sup b][vert-bar]1.0 and[rho][sub[tau]][sup b] 8 GeV/c is extracted and found to be consistent with next-to-leading order QCD predictions. In addition, the angular correlations between the b and[bar b]-quarks are found to agree in shape with next-to-leading order QCD predictions.
The Diphoton Production Rate in Bar Pp Collisions at Radicals
Author: Scientific and Technical Aerospace Reports
Author: Diphoton and Photon + B/c Cross Sections at CDF II.
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Languages : en
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A measurement of the rate of prompt diphoton production in p[bar p] collisions at [radical]s = 1.96 TeV using the CDF detector is presented. The results are compared to a NLO calculation. They also measured the [gamma] + b and [gamma] + c cross sections comparing the results with PYTHIA LO predictions. The background from non-prompt sources is estimated using a statistical method based on differences in electromagnetic showers initiated by photons and by the background.
Search for W Boson Pair Production in Pbar P Collisions at Radicals
Author: D0 Measurements of Beauty Production in P[bar P] Collisions At[radical]
![D0 Measurements of Beauty Production in P[bar P] Collisions At[radical] PDF](https://books.google.com/books/content/images/frontcover/XS_yjwEACAAJ?fife=w80-h100)
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Languages : en
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We report a number of results on beauty production from the D[null] experiment at the Fermilab Tevatron Collider operating at[radical]s= 1.8 TeV. Measurements of the[ital b][ital[anti b]] production cross section using single muon, muon plus jet and dimuon plus jet triggers, in the data collected in 1992-93, are presented. A preliminary measurement of the[ital b][ital[anti b]] angular correlations using the dimuon data sample is also presented. We find that the[ital b]-quark production cross section for[vert-bar][ital Y][sup b][vert-bar][lt] 1.0 and[ital p][sub T][sup b][gt] 8 GeV/c is systematically higher than, although consistent within errors with, the next-to-leading order (NLO) QCD predictions. A similar comparison with QCD is observed in the[ital b][ital[anti b]] ([mu][mu]) angular correlations, where the shape of the distribution indicates a sizable contribution fro the NLO process.
Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2)
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Languages : en
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The authors present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb[sup -1] of p[bar p] collisions at [radical]s = 1.96 TeV they observe no candidate events, with an expected standard model background of 0.27 [+-] 0.07(stat) [+-] 0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c[sup 2], and lightest neutralino of 93 GeV/c[sup 2] at 95% confidence level in a gauge-mediated supersymmetry-breaking model with a light gravitino.
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