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Showing 1 to 12 of 12 for “"top quark mass"”.
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Top quark mass measurement in the electron+jets decay channel using the Matrix Element Method
… in the course of the year 2012 at a center of mass energy of 8 TeV. Data recorded by the Compact Muon Solenoid at CERN, were filtered in order to isolate collisions giving rise to a top anti-top quark pair. These quarks decay into an electron and four jets. For a recorded luminosity 19.8 fb-1, …
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Sensitivity of the Top quark mass measurement with the CMS experiment at LHC using t-tbar multijet simulated events
… which is the actual goal of the experiment. The topic of physics work of this thesis is the study of tt events fully hadronic decay in the CMS experiment. A multi-jet trigger has been provided to fix a reasonable starting point, reducing the multi-jet sample to the nominal trigger rate. An …
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Measurement of the top quark mass from top quarks produced in proton-proton collisions at √s = 13 TeV that decay to dimuons via a J/ψ
The top quark mass is measured using tt → lepton + J/ψ(→ µ +µ −) events, using proton-proton collision data collected by the ATLAS detector at a centre-of-mass energy of √ s = 13 TeV, during 2015-2018. The data corresponds to a total integrated luminosity of 139.0 fb−1 . This lepton + J/ψ channel …
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Characterizing the background in tt events with a J/ψ → µ −µ + in proton-proton collisions at √ s = 13 TeV using the ATLAS detector
… various measurements have been performed for the top quark mass using jets as a dominant experimental signature. The leading precision measurement of 1732.44 ±0.13±0.47 GeV is a combination of top quark mass measurements conducted by the CMS collaboration. However, these various measurements …
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A MEASUREMENT OF Rμ = σ(W → μv)/σ(Z^0→ μ^+ μ^-) IN PP ̅ COLLISIONS AT √S = 1.8 TEV
… ratio and width, and a lower bound on the top quark mass of 45 GeV / c^2 (95% CL) which is independent of the decay mode. Lepton universality is confirmed in this energy domain. All results are in agreement with standard model predictions.
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Hadronic productions of a Higgs boson in association with two jets at next-to-leading order
… Higgs couples to gluons in the limit of a large top quark mass. We treat the Higgs as the real part of the complex field φ that couples to the self-dual field strengths. We use modern on-shell inspired methods to calculate helicity amplitudes and we give a detailed review of unitarity based and …
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Measurement of W Boson Polarization in Top Quark Decay
… of the polarization of the W boson from top quark decay is an excellent test of the V-A form of the charged-current weak interaction in the standard model. Since the longitudinal W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives a …
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Signals of supersymmetry in top quark decays at positron-electron and hadron-hadron colliders
… influence of supersymmetry on the search for the top quark (as yet, undiscovered) by studying the two specific processes: $e\sp+ e\sp-$ $\to$ $\Theta$ $\to$ $g\tilde{g}\tilde{k}$, where $\tilde{k}$ is either a $\tilde{g}$ or $\tilde{\gamma}$, and $pp \to$ $t\bar{t}X$ followed by $t$ $\to$ …
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PHENOMENOLOGY OF THE STANDARD MODEL AND BEYOND
… (DM) in the universe or that the neutrinos have masses. Furthermore, theoretical puzzles such as the matter-antimatter asymmetry and the Planck-weak hierarchy remain unexplained within the SM. These shortcomings have motivated extensive efforts to search for physics beyond the SM (BSM). One …
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Top mass determination using Effective Field Theories
The top quark mass is one of the most important Standard Model parameters and its mass has been measured at sub-percent precision by the Tevatron and LHC using Monte Carlo (MC) based methods. The resulting MC top mass parameter suffers from 0(1 GeV) uncertainty due to lack of specification of a …
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Holly Pacey and the Half-Spin Particles: Searching for new physics with leptons at the ATLAS experiment
… decaying via W-bosons, excluding chargino masses up to 410 GeV for a massless neutralino. This was surpassed by the second search, resulting in world-leading exclusion limits on this process, up to 420 GeV, as well as excluding direct slepton production with slepton masses up to 700 GeV and …