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Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
Preliminary results are presented from a study of {bar p}p → W[gamma] + X at √s = 1800 GeV at D0 using data from its recently completed first run at the Fermilab Tevatron Collider. The analysis is performed in both the electron and muon channels. In each channel 10 events are observed, which, after subtracting backgrounds, agrees with the Standard Model expectation. Study of this process is a direct test of the couplings of the WW[gamma] vertex. Using a Monte Carlo calculation of the dependence of the number of expected events on these couplings, we set preliminary limits (at the 95% confidence level) on the anomalous couplings of -2.5 ≤ [Delta][kappa] ≤ 2.7 ([gamma] = 0) and -1.2 ≤ [lambda] ≤ 1.1 ([Delta][kappa] = 0).
Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
Preliminary results are presented from a study of {bar p}p → W[gamma] + X at √s = 1800 GeV at D0 using data from its recently completed first run at the Fermilab Tevatron Collider. The analysis is performed in both the electron and muon channels. In each channel 10 events are observed, which, after subtracting backgrounds, agrees with the Standard Model expectation. Study of this process is a direct test of the couplings of the WW[gamma] vertex. Using a Monte Carlo calculation of the dependence of the number of expected events on these couplings, we set preliminary limits (at the 95% confidence level) on the anomalous couplings of -2.5 ≤ [Delta][kappa] ≤ 2.7 ([gamma] = 0) and -1.2 ≤ [lambda] ≤ 1.1 ([Delta][kappa] = 0).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The CDF and D0 collaborations have used recent data taken at the Tevatron to perform QCD tests with W and Z bosons decaying leptonically. D0 measures the production cross section times branching ratio for W and Z bosons and determines the branching ratio B(W[yields] l[nu])= (10.43[+-] 0.44)% (l= e, [mu]). This also gives an indirect measurement of the total width of the W boson:[Gamma][sub W]= 2.16[+-] 0.09 GeV. The W cross section times branching ratio into tau leptons is measured to be[sigma]([anti p]p[yields] W+ X)B(W[yields][tau][nu])= 2.38[+-]0.13 nb, from which the ratio of the coupling constants is determined: g[sub[tau]][sup W]/g[sub e][sup W]= 1.004[+-] 0.019[+-] 0.026. D0's measurement of the differential d[sigma]/dP[sub T] distribution for the Z boson decaying to electrons, discriminates between different phenomenologic vector boson production models. CDF measures the cross section for the Drell-Yan continuum, and extracts improved limits on compositeness scales for quarks and leptons of[Lambda][sub ql][approximately] 3 - 6 TeV, depending on the model. Studies of W+ Jet production at CDF and D0 find that the QCD prediction underestimates the production rate of W+ 1 Jet events by about a factor of 2 as measured by both collaborations.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The results from the direct measurements of the trilinear gauge boson couplings are reported using the data taken with the D[null] detector at Fermilab. The limits on the anomalous coupling parameters were obtained at the 95% CL from three processes, [ital WW/WZ] production with the subsequent[ital W] boson decay to an electron and a neutrino and the second[ital W] or[ital Z] boson decay to two jets and[ital W][sub[gamma]] and[ital Z][sub[gamma]] productions with the subsequent[ital W] and[ital Z] boson decays to electron and muon channels.
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
New data set recorded by D0 experiment at the Tevatron collider at √s = 1.96 TeV makes the diboson physics program an attractive probe of electroweak gauge structure in the Standard Model. Here we present the most recent diboson production cross section measurements at D0 for W[gamma], Z[gamma], WZ and ZZ and report on the tightest limits to date on the neutral trilinear gauge boson couplings in Z[gamma] production. Depending on the analysis the size of utilized RunIIa data collected during 2002-2006 by the D0 detector is 0.8-1.0 pb−1.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We present measurements on gauge boson production from data taken during 1994-1996 by the D0 and CDF detectors: the differential production cross section of the W boson as a function of the transverse momentum [1,2], the ratio of W and Z differential cross sections [3,4], direct photon cross-sections at (square root)s = 630 and 1800 GeV [5,6], and studies of Drell-Yan production [7,8]. All measurements are in good agreement with currently available theoretical predictions in most of the measured kinematic range.
Author: Publisher: ISBN: Category : Research Languages : en Pages : 1142
Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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Author: United States. Energy Research and Development Administration