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Evidence of W?? Production in Pp Collisions at S

Evidence of W?? Production in Pp Collisions at S
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Release: 2015
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Here we report evidence of triple gauge boson production pp→W(l?)??+X, which is accessible for the first time with the 8 TeV LHC data set. The fiducial cross section for this process is measured in a data sample corresponding to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in 2012. Events are selected using the W boson decay to e? or ?? as well as requiring two isolated photons. The measured cross section is used to set limits on anomalous quartic gauge couplings in the high diphoton mass region.

Evidence for the Production of Two $W$ Bosons with the Same Electric Charge and Two Jets in 20.3 Fb$^{-1}$ of $pp$ Collisions at $\sqrt{s}

Evidence for the Production of Two $W$ Bosons with the Same Electric Charge and Two Jets in 20.3 Fb$^{-1}$ of $pp$ Collisions at $\sqrt{s}
Author: Alexander Sood
Publisher:
Total Pages: 155
Release: 2014
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This dissertation presents a measurement of \ssWW production in proton-proton collisions with a center-of-mass energy of 8 TeV at the Large Hadron Collider using the ATLAS detector. The $W$ bosons are required to decay leptonically, giving a signature of two leptons of the same electric charge, two jets, and missing transverse energy. The analysis is performed on the entire 8 TeV dataset, corresponding to an integrated luminosity of 20.3 fb$^{-1}$. The cross section is measured in two fiducial regions, and an excess over the background-only prediction is observed with a significance of 4.5$\sigma$ for inclusive \ssWW production and 3.6$\sigma$ for electroweak \ssWW production. The measured cross sections are in agreement with Standard Model predictions, and limits are set on anomalous quartic gauge couplings.

Spin Correlations in tt Events from pp Collisions

Spin Correlations in tt Events from pp Collisions
Author: Boris Lemmer
Publisher: Springer
Total Pages: 246
Release: 2015-06-24
Genre: Science
ISBN: 3319189328
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This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.

Measurement of Associated W + Charm Production in Pp Collisions at $\sqrt{s}$

Measurement of Associated W + Charm Production in Pp Collisions at $\sqrt{s}$
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Total Pages: 63
Release: 2014
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Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 inverse femtobarns, collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region $p_T^{jet} \gt$ 25 GeV, $

Measurement of $W+̂ W-̂$ Production and Search for the Higgs Boson in Pp Collisions at Sqrt(s)

Measurement of $W+̂ W-̂$ Production and Search for the Higgs Boson in Pp Collisions at Sqrt(s)
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Total Pages: 47
Release: 2011
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A measurement of WW production in pp collisions at sqrt(s) = 7 TeV and a search for the Higgs boson are reported. The WW candidates are selected in events with two leptons, either electrons or muons. The measurement is performed using LHC data recorded with the CMS detector, corresponding to an integrated luminosity of 36 inverse picobarns. The pp to WW cross section is measured to be 41.1 +/- 15.3 (stat) +/- 5.8 (syst) +/- 4.5 (lumi) pb, consistent with the standard model prediction. Limits on WW gamma and WWZ anomalous triple gauge couplings are set. The search for the standard model Higgs boson in the WW decay mode does not reveal any evidence of excess above backgrounds. Limits are set on the production of the Higgs boson in the context of the standard model and in the presence of a sequential fourth family of fermions with high masses. In the latter context, a Higgs boson with mass between 144 and 207 GeV is ruled out at 95% confidence level.