Diphoton Production In Pbar P Collisions Atradical PDF Download
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| Release | : 2001 |
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Download Diphoton Production in P[bar P] Collisions At[radical] Book in PDF, ePub and Kindle
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.
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| Release | : 1995 |
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Download Diphoton Production in Pbar P Collisions at Radicals Book in PDF, ePub and Kindle
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| Release | : 2005 |
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Download Diphoton and Photon + B/c Cross Sections at CDF II. Book in PDF, ePub and Kindle
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.
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| Total Pages | : 692 |
| Release | : 1995 |
| Genre | : Aeronautics |
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Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
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| Release | : 2001 |
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Download D0 Measurements of Beauty Production in P[bar P] Collisions At[radical] Book in PDF, ePub and Kindle
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.
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| Release | : 2001 |
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Download Rapidity Dependence of the Inclusive J/[psi] Production in P[bar P] Collisions At[radical] Book in PDF, ePub and Kindle
We have studied the[ital J]/[psi] production in[ital p][ital[anti p]] collisions at[radical]s= 1.8 TeV with the D[null] detector at the Fermilab Tevatron, using a[mu][sup+][mu][sup -] data sample collected during the 1994-95 running period. We have measured the inclusive[ital J]/[psi] production cross section as a function of the[ital J]/[psi] transverse momentum, [ital P][sub T][sup[ital J]/[psi]] in the central and forward rapidity regions. The new measurement of the cross section[ital d[sigma]/dp][sub T][sup[ital J]/[psi]] for[vert-bar][eta][sup[ital J]/[psi]][vert-bar][lt] 0.6 is in a good agreement with the CDF and earlier D[null] results. The cross section measurement[ital d[sigma]/dp][sub T][sup[ital J]/[psi]] for 2.5[lt][vert-bar][eta][sup[ital J]/[psi]][vert-bar][lt] 3.7 covers the[ital p][sub T][sup[ital J]/[psi]] range from 1 to 16 GeV/c. We combine the measurements in several[vert-bar][eta][sup[ital J]/[psi]][vert-bar] regions to discuss[ital d[sigma]/d[eta]][sup[ital J]/[psi]] for[ital p][sub T][sup[ital J]/[psi]][gt] 8 GeV/c. The data are compared with the next-to- leading order (NLO) QCD calculations, which take into account different[ital J]/[psi] production mechanisms.
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| Release | : 2001 |
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Download The B[bar B] Production Cross Section and Correlations in P[bar P] Collisions At[radical] Book in PDF, ePub and Kindle
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.
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| Release | : 2003 |
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Download A Search for New Physics in Photon-lepton Events in Proton-antiproton Collisions At[radical] S Book in PDF, ePub and Kindle
We present the results of a search in p[bar p] collisions at[radical]s= 1.8 TeV for anomalous production of events containing a photon with large transverse energy and a lepton (e or[mu]) with large transverse energy, using 86 pb[sup -1] of data collected at the Collider Detector at Fermilab during the 1994-95 collider run at the Fermilab Tevatron. The presence of large missing transverse energy (E[sub T]), additional photons, or additional leptons in these events is also analyzed. The results are consistent with standard model expectations, with the possible exception of photon-lepton events with large E[sub T], for which the probability of a statistical fluctuation of the standard model expectation up to and above the observed level is 0.7%.
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| Release | : 2005 |
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Download Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2) Book in PDF, ePub and Kindle
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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| Total Pages | : 5 |
| Release | : 1994 |
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Download The Diphoton Production Rate in {bar P}p Collisions at (square Root)s Book in PDF, ePub and Kindle
A measurement of the rate of prompt diphoton production in {bar p}p collisions at (square root)s = 1800 GeV using the CDF detector is presented. The background from non-prompt sources is estimated using a sample of single photon candidate events. The results are compared to a next-to-leading order calculation by Bailey, et al. Both background and signal take on particular significance as an indicator of our ability to estimate the backgrounds affecting LHC low mass Higgs to diphoton searches.
