Search for Hadronic Resonances of W/Z in Photon Events at CDF

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The authors present a study of the p{bar p} {yields} W(Z){gamma} {yields} {gamma}q{bar q} process at the center-of-mass energy {radical}s = 1.96 TeV using data collected by the Collider Detector at Fermilab. The analysis is based on the selection of low transverse momentum photons produced in association with at least two jets. A modification of an existing photon trigger was studied and implemented in the data acquisition system to enhance the sensitivity of this analysis. The data presented are from approximately 184 pb{sup -1} of integrated luminosity collected by this new trigger. A preliminary event sample is obtained requiring a ... continued below

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160 pages

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Bocci, Andrea & U., /Rockefeller January 1, 2005.

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The authors present a study of the p{bar p} {yields} W(Z){gamma} {yields} {gamma}q{bar q} process at the center-of-mass energy {radical}s = 1.96 TeV using data collected by the Collider Detector at Fermilab. The analysis is based on the selection of low transverse momentum photons produced in association with at least two jets. A modification of an existing photon trigger was studied and implemented in the data acquisition system to enhance the sensitivity of this analysis. The data presented are from approximately 184 pb{sup -1} of integrated luminosity collected by this new trigger. A preliminary event sample is obtained requiring a central photon with E{sub T} > 12 GeV and two jets with E{sub T} > 15 GeV. The corresponding efficiency is studied using a Monte Carlo simulation of the W(Z){gamma} {yields} {gamma}q{bar q} based on Standard Model predictions. Monte Carlo estimation of the background is not necessary as it is measured from the data. A more advanced selection based on a Neural Network method improves the signal-to-noise ratio from 1/333 to 1/71, and further optimization of the dijet mass search region increases the ratio to its final value of 1/41. No evidence of a W/Z {yields} q{bar q} peak in the dijet mass distribution is visible when the background contribution is subtracted. Using a fully Bayesian approach, the 95% confidence level upper limit on {sigma}(p{bar p} {yields} W{gamma}) x {Beta}(W {yields} q{bar q}) + {sigma}(p{bar p} {yields} Z{gamma}) x {Beta}(Z {yields} q{bar q}) is calculated to be 54 pb, which is consistent with the Standard Model prediction of 20.5 pb.

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160 pages

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  • Report No.: FERMILAB-THESIS-2005-38
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 878940
  • Archival Resource Key: ark:/67531/metadc876467

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  • January 1, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 8, 2016, 10:06 p.m.

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Bocci, Andrea & U., /Rockefeller. Search for Hadronic Resonances of W/Z in Photon Events at CDF, thesis or dissertation, January 1, 2005; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc876467/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.