Measurement Of The W W Production Cross Section And Search For Anomalous Wwgamma And Wwz Couplings In P Bar P Collisions At Sqrts
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| Release | : 2009 |
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This Letter describes the current most precise measurement of the W boson pair production cross section and most sensitive test of anomalous WW[gamma] and WWZ couplings in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The WW candidates are reconstructed from decays containing two charged leptons and two neutrinos, where the charged leptons are either electrons or muons. Using data collected by the CDF II detector from 3.6 fb−1 of integrated luminosity, a total of 654 candidate events are observed with an expected background contribution of 320 ± 47 events. The measured total cross section is [sigma](p{bar p} 2!WW− + X) = 12.1 ± 0.9 (stat){sub -1.4}{sup +1.6} (syst) pb, which is in good agreement with the standard model prediction. The same data sample is used to place constraints on anomalous WW[gamma] and WWZ couplings.
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| Total Pages | : 176 |
| Release | : 2008 |
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The cross section for WW production is measured and limits on anomalous WW[gamma] and WWZ trilinear gauge couplings are set using WW → ee/e[mu]/[mu][mu] events collected by the Run II D0 detector at the Fermilab Tevatron Collider corresponding to 1 fb−1 of integrated luminosity at √s = 1.96 TeV. Across the three final states, 108 candidate events are observed with 40.8 ± 3.8 total background expected, consistent with [sigma](p{bar p} → WW) = 11.6 ± 1.8(stat) ± 0.7(syst) ± 0.7(lumi) pb. Using a set of SU(2){sub L} {direct_product} U(1){sub Y} conserving constraints, the one-dimensional 95% C.L. limits on trilinear gauge couplings are -0.63
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| Release | : 2012 |
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This Letter describes the current most precise measurement of the WZ production cross section as well as limits on anomalous WWZ couplings at a center-of-mass energy of 1.96 TeV in proton-antiproton collisions. The WZ candidates are reconstructed from decays containing three charged leptons and missing energy from a neutrino, where the charged leptons are either electrons or muons. Using data collected by the CDF II detector (7.1 fb−1 of integrated luminosity), 64 candidate events are observed with the expected background contributing 8 ± 1 events. The measured total cross section?(p{bar p} → WZ) = 3.93{sub -0.53}{sup +0.60}(stat){sub -0.46}{sup +0.59}(syst) pb is in good agreement with the standard model prediction of 3.50 ± 0.21. The same sample is used to set limits on anomalous WWZ couplings.
| Author | : Advait Neel Nagarkar |
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| Total Pages | : 73 |
| Release | : 2012 |
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I present a measurement of the W±Z production cross section in the leptonic final states in pp collisions at √s = 7 TeV and limits on anomalous trilinear gauge couplings, using 4.64 fb-1 of data collected using the ATLAS experiment at the LHC. The production cross section has been determined to be 19.0+1.4-1.3(stat.)±0.9(syst.)±0.4(lumi.) pb, in agreement with the Standard Model (SM) expectation of 17.6+1.1-1.0 pb. A search for anomalous trilinear gauge couplings has been conducted and limits have been set at the 95% confidence level; the result is consistent with the SM couplings.
| Author | : Jacob Thomas Ribnik |
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| Total Pages | : 177 |
| Release | : 2011 |
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| ISBN | : 9781124885773 |
This dissertation describes the first WW production cross-section measurement in 35.5 pb-1 of s = 7 TeV pp collision data recorded by the CMS detector. The ee, emu and mumu final states are considered. The event yields, expectations and systematic uncertainties arc presented, and the data-driven methods used to estimate the background and selection efficiency are discussed in detail. The cross-section is measured to be sigmaWW = 41.1 +/- 15.3(stat.) +/- 5.8(syst.) +/- 4.5(lumi.) pb. The same data is used to place constraints on anomalous WWgamma and WWZ couplings.
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| Total Pages | : 39 |
| Release | : 2015 |
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The cross section for the production of Z[gamma] in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb-1. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. Furthermore, the differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. These observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. As a result, limits on anomalous triple gauge couplings of ZZ[gamma] and Z[gamma][gamma] are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.
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| Total Pages | : 8 |
| Release | : 2010 |
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The standard model (SM) of particle physics has been extensively tested in the past three decades and is found to be in excellent agreement with experimental observations. It is widely assumed, however, that the SM is only a low energy approximation of a more general theory. Therefore, any significant deviation from the SM predictions yields information on the nature of a more fundamental theory. Production of WZ pairs is the least studied diboson process within the SM, as it is a charged final state and can only be produced at hadron colliders. A detailed study of this process probes the electroweak sector of the SM. In addition, searches for new phenomena in the production of heavy gauge boson pairs are interesting, as many extensions of the SM predict 1-4 additional heavy gauge bosons that can decay into a WZ boson pairs.
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| Release | : 2001 |
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We present a preliminary result from a search for anomalous WW and WZ production in p[bar p] collisions at[radical]s= 1.8 TeV using p[bar p][yields] e[nu]jj events observed during the 1992-1993 run of the Fermilab Tevatron collider. A fit to the p[sub T] spectrum of W(e[nu]) yields direct limits on the CP-conserving anomalous WW[gamma] and WWZ coupling parameters of -0.89
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| Total Pages | : 176 |
| Release | : 2008 |
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The cross section for WW production is measured and limits on anomalous WW? and WWZ trilinear gauge couplings are set using WW → ee/e?/?? events collected by the Run II D0 detector at the Fermilab Tevatron Collider corresponding to 1 fb-1 of integrated luminosity at √s = 1.96 TeV. Across the three final states, 108 candidate events are observed with 40.8± 3.8 total background expected, consistent with ?(p$ar{p}$ → WW) = 11.6 ± 1.8(stat) ± 0.7(syst) ± 0.7(lumi) pb. Using a set of SU(2)L Ⓧ U(1)Y conserving constraints, the one-dimensional 95% C.L. limits on trilinear gauge couplings are -0.63 ??sub?/sub 0.99, -0.15 ?sub?/sub 0.19, and -0.14
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| Total Pages | : 8 |
| Release | : 2005 |
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We present a measurement of the WW− production cross section using 184 pb−1 of p{bar p} collisions at a center-of-mass energy of 1.96 TeV collected with the Collider Detector at Fermilab. Using the dilepton decay channel W+W− → l+?l−{ovr {nu}}, where the charged leptons can be either electrons or muons, we find 17 candidate events compared to an expected background of 5.0{sub -0.8}{sup +2.2} events. The resulting W+W− production cross section measurement of?(p{bar p} → W+W−) = 14.6{sub -5.1}{sup +5.8}(stat){sub -3.0}{sup +1.8}(syst) ± 0.9(lum) pb agrees well with the Standard Model expectation.
