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.
Results
Showing 1 to 17 of 17 for “"Dilepton"”.
-
Angular distributions of high-mass dilepton production in hadron collisions
"The SeaQuest experiment is a fixed-target dimuon experiment currently running at the Fermi National Accelerator Laboratory (FNAL). By utilizing the high-intensity, 120GeV proton beam delivered by the FNAL Main Injector (MI), SeaQuest is able to measure proton-induced Drell-Yan dimuon production …
-
Search for supersymmetric particles in opposite sign dilepton events with the CMS detector
… signature (which we refer to as opposite sign dilepton signature) has a very good background rejection power and would permit systematic studies of the supersymmetric particles produced, once a sufficient amount of them is collected. The bulk of the analysis consists on the isolation of the …
-
Pre-equilibrium photon and dilepton production from the early stages of high-energy heavy-ion collisions
… their emission: these probes are photons and dileptons, also referred to as electromagnetic probes. Additionally, photons and dileptons are produced throughout the entire space-time evolution of a heavy-ion collision. Thus, understanding them in the context of a thermalizing QGP allows for …
-
Measurement of the top anti-top quark pair production cross section in the dilepton decay channel using Lepton+Track selection in 7 TeV p − p collisions with L = 698 PB−1
… at the LHC with pp collisions at √s = 7 TeV in dilepton final states, from a data sample of L=698 pb−1 taken in 2011. For dilepton pair selection we have used a ‘Lepton+Track’ approach, where selection requirements on one lepton leg are reduced to a requirement of only a high quality Inner …
-
Measurement of the Drell--Yan differential cross section with the CMS detector at the LHC
… the dimuon and dielectron channels covering the dilepton mass range of 15 to 2000\GeV and absolute dilepton rapidity from 0 to~2.4 are presented. The Drell–Yan cross section in proton-proton collisions depends on empirical quantities known as parton distribution functions (PDFs) which …
-
PROBING THE HIGGS BOSON WITH THE ATLAS DETECTOR: PRECISION MEASUREMENTS OF THE MASS AND SEARCH FOR RARE DECAYS TO A LOW-MASS DILEPTON SYSTEM AND A PHOTON IN PROTON-PROTON COLLISIONS AT THE LHC
… yet observed, namely the decay into a low-mass dilepton system and a photon. \noindent The first analysis presents a precision measurement of the Higgs boson mass in the diphoton decay channel, $H \rightarrow \gamma\gamma$, using the full Run~2 dataset. The Higgs boson mass is measured to be …
-
A search for the Higgs boson in H->WW->lvlv with 8.2 fb-1
… The base analysis searches for opposite-sign dilepton events. We employed three separately trained neural networks to distinguish signal from background processes for events with 0, one, or two jets. To further increase sensitivity for 0-jet events, we constructed a likelihood ratio …
-
Topics in the generalized vector dominance model
… In the first topic we construct a model for dilepton production in hadron·hadron interactions based on the idea of generalized vectordominance. We argue that in the high-mass region the generalized vectordominance model and the Drell-Yan parton model are alternative descriptions of the same …
-
A feasibility study for electron-muon correlations at ALICE
… feasibility of using e-μ pairs as an alternative dilepton probe for heavy quark studies in proton-proton collisions. The e-μ channel would provide a much cleaner/low background signal than other currently-utilized probing methods, but it is statistics-limited, a re-striction which is of increased …
-
Study of the Higgs Boson Produced in Association with a Weak Boson and Decaying to WW* with a Same Sign Dilepton and Jets Final State in √ s =8 TeV pp Collisions with the ATLAS Detector at the LHC
The research described in this thesis is aimed at studying production of a Higgs boson in association with a W boson, in the H → W W ∗ decay mode, using 20 fb −1 of 8 TeV data collected in 2012. The specific final state studied in this thesis has the associated W boson and one of the W bosons from …
-
Electron-Pair Production in 158 AGeV/c Pb-Au Collisions from CERES
… nuclear matter. A significant enhancement of dilepton pair yield with respect to expectations based on hadron decays was observed in the mass range 0.25~$<~$m$_{ee}~<$~0.7~GeV/c$^2$. This fascinating result can only be described by models invoking in-medium modifications of the $\rho$ meson. …
-
Tests of lepton universality in $B^{0} \to K_{S}^{0} l^{+} l^{-}$ and $B^{+} \to K^{*+} l^{+} l^{-}$ decays at the LHCb experiment
… K^{*+} e^{+} e^{-}$ are measured in bins of the dilepton invariant mass squared. The first ever observations of these decays are reported.
-
Search for Diboson resonances in 8 tev and 13 tev proton-proton collisions at the large hadron collider with the atlas detector
… G∗ → V V , scalar → V V and V ′ → V V/V H/dilepton. The V V and V H dibosons then decay into qqqq, ννqq, lνqq, llqq, lνlν, llνν, lνll, llll, qqbb, ννbb, lνbb, or llbb which are all combined (14 channels). No evidence for resonant diboson production is observed, and resonance masses below …
-
Searches for supersymmetric particles in events with two opposite-sign same-flavor leptons, jets, and large missing transverse energy
… productions, in the same-flavor opposite-sign dilepton channel. The SUSY analyses usually require large missing transverse energy MET for the presence of invisible LSPs. One of the most difficult background processes to estimate in these searches is due to artificial MET from hadronic object …
-
A Measurement of the Jet Multiplicity in Di-lepton Final States of ttbar Events
A measurement of the jet multiplicity in di-leptonically decaying ttbar events (i.e. ttbar → (ee, μμ, eμ) + missing transverse momentum + jets) is presented, using 4.66 fb -1 of data collected from √ s = 7 TeV pp collisions at the CERN Large Hadron Collider. In order to mitigate the effects of …
-
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 …