Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Z bosons"”.
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Search for anomalous couplings in the decay of polarized Z bosons to tau lepton pairs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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A search for Z' bosons in the dimuon decay channel in 8 TeV proton-proton collisions
In this thesis, I present a search for $Z'$ bosons in the $\mu^+\mu^-$ decay channel using 20 fb$^{-1}$ of $p$-$p$ collisions at $\sqrt{s} = 8 $ TeV, produced during the 2012 run at the Large Hadron Collider at CERN, using the ATLAS detector to record the collision products. The search proceeds via …
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Precision measurement of and search for dark matter in the transverse momentum spectra of Z bosons
A measurement of the differential Z boson production cross section in proton-proton collisions is presented. It furnishes a precision test of the Standard Model, and constrains the parton distribution functions of the proton. Moreover, it is a building block for future measurements of the mass of …
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Inclusive Electroweak measurements in the muon channel with pp collisions at [the square root of] s=7 TeV
… the measurement of the production of W and Z bosons in proton-proton collisions at [the square root of]s = 7 TeV with the Large Hadron Collider (LHC). In the LHC, W and Z bosons are produced at a high rate, providing for large yields, which along with the clean signature of W boson decay into …
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The ZZ → 4l process and anomalous triple gauge couplings with ATLAS at the LHC
… is measured in a phase-space in which both $Z$ bosons have a mass $m_{Z}$ in the range 66 GeV $ < m_{Z} < $ 116 GeV to be 16.5 $\pm 0.5$ (stat.) $\pm 0.4$ (syst.) $\pm 0.5$ (lumi.)$\,$ pb which is consistent with a next-to-next-to-leading-order prediction of $16.9^{+0.6}_{-0.5}$ pb. Observed …
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Search for the Higgs Boson in the ZZ --> ℓℓvv channel with CMS
… the massive weak force mediators - the W and Z bosons, are required to be massless to satisfy gauge symmetry. To incorporate EWSB into the SM, the Higgs mechanism is invoked and introduces a scalar field, the Higgs field, that couples to the W and Z bosons and gives them mass. Additionally, the …
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Observation and examination of a Higgs boson in the ZZ to four lepton channel
… of the Standard Model (SM) Higgs boson to two Z bosons to four charged leptons. We observe a single excess above background expectation with a significance of 7.4 standard deviations at a mass of 125.6 ±0.4(stat) ±0.2(syst) GeV. This excess has a signal strength parameter ... We examine the …
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Measurement Of Angular Coefficients Of Drell-Yan E(+) E(-) Pairs In Ppbar Collisions At Square Root Of Center Of Mass Energy Of 1.96 Tev.
… the details of the production mechanism of Z bosons via quark anti-quark annihilation or quark-gluon Compton scattering.
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A measurement of W boson-photon and Z boson-photon cross sections in the muon channel in 1.8 TeV proton-antiproton collisions
… sensitive to anomalous couplings of the W and Z bosons. Using the $W\sb{\gamma}$ and $Z\sb{\gamma}$ absolute cross section measurements, the absence of an excess of hard photons accompanying W and Z boson production enables us to obtain direct limites on anomalous $WW\sb{\gamma}$, $ZZ\sb{\gamma}$ …
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Using Z-hadron correlations to probe the medium response in PbPb and pp collisions at √ˢNN = 5.02 TeV
… angle distributions with respect to the Z bosons, whih are sensitive to modification of in-medium parton shower and medium recoils, are measured in central PbPb collisions. A significant modification of the two particle correlation in pseudorapidity difference and azimuthal angle difference …
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Generator-level acceptance for the measurement of the inclusive cross section of W-boson and Z-boson production in pp collisions at [square root of] s = 5 TeV with the CMS detector at the LHC
… the CMS detector of leptonic decays of W and Z bosons produced in pp colisions at [square root of]s = 5 TeV is calculated using Monte Carlo event simulation. Statistical and systematic uncertainties on the acceptance measurement from PDF and a, uncertainty and higher-order correction are …
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Observations and measurement of W boson production and triple gauge couplings at LEP II
… are then used to measure the couplings of Wbosons with Z bosons and photons. Emphasis is placed on the unambiguous and efficient combination of the information from the different production and decay channels. For the couplings in the model in which gauge invariance is realised linearly, the …
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Messung der Reaktion e+ e- ZZ q anti-q l+ l mit dem L3-Detektor bei LEP
… thesis measurements of the pair production of Z bosons and their decay into a final state with two quarks and two charged leptons are performed. The data have been recorded in the years 1997 to 2000 with the L3 experiment at CERN in Geneva. The integrated luminosity of this data set is 683 1/pb, …
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Electroweak physics and evidence for a Higgs boson decaying to a pair of tau leptons with the CMS detector
… and their ratios are performed. The W and Z bosons are observed via their decays to electrons and muons. An indirect determination of the total width of the W boson and the B(W --> lv) from the measured cross section ratios is described. The discovery of a new boson with a mass of 125 GeV at …
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Measurement of cross section times branching ratio for W boson + photon and Z boson + photon and search for anomalous W boson-photon and Z boson-photon couplings at 1.8 TeV
… search for anomalous couplings between the gauge bosons was also carried out using these results. Assuming only one anomalous coupling to be non-zero at a time, the 95% CL limits on $W\gamma$ anomalous couplings are, $-3.7 < \Delta\kappa\ < 3.7, -1.2 < \lambda < 1.2, -3.8 < \tilde\kappa < 3.8$ and …
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Search for gravitons using merged jets from Z boson decays with the ATLAS experiment
… for anomalous production of a pair of gauge bosons (ZZ or WZ) from the decay of a narrow massive resonance. Data corresponding to 2.0 fb-1 of integrated luminosity collected by the ATLAS experiment from proton-proton collisions at 7 TeV. Events with two charged leptons and either two resolved …
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MISSING TRANSVERSE ENERGY MEASUREMENT IN ATLAS DETECTOR:FIRST LHC DATA RESULTS AND IMPORTANCE FOR PHYSICS STUDY
… both for Standard Model chan- nels, as W, Z bosons decaying to τ leptons or top quark decays, and for miss are expected to be the key discovering channels. Events with large ET signature for new physics such as supersymmetry and extra dimensions. A miss measurement in terms of linearity and …