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Showing 1 to 18 of 18 for “"gluon fusion"”.
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Testing the Standard Model With Top Quark Production
Using the next-to-leading-order results for the W-gluon fusion cross section, we analyze the possibilities for studying single-top-quark production at the Tevatron and LHC. We find that there may be evidence for single-top-quark production in Run I data. Run II at the Tevatron should allow the …
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Testing the Standard Model with Top-Quark Production
… to single-top-quark production via W -gluon fusion at the Fermilab Tevatron, the CERN Large Hadron Collider, and DESY HERA. Using a b-quark distribution function to sum collinear logarithms, we show that there are two independent corrections, of order 1/ ln(m? /m~) and as. This …
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Determination of the gluon polarisation in the nucleon using hadron pairs with high transverse momentum at COMPASS
… has been measured, the contributions from gluons and orbital angular momentum are not constrained. <br> <br>This thesis is dedicated to the determination of the gluon polarisation in the nucleon. The analysis is based on the data taken by the COMPASS experiment at CERN during the years 2002 …
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Production of omega and phi mesons by 193 GeV/c pions and 250 GeV/c protons on a beryllium target
… beam types are compared. When a simple parton fusion model is used to describe the Feymnan-X distributions the omega appears to be produced predominantly by gluon fusion.
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Searches for Higgs Boson Pair Production in the bbbb Final State with the ATLAS Detector
… of a heavy Higgs-like resonance $X$ via gluon-gluon fusion, which then decays into a Standard Model Higgs boson ($H$) and a lighter scalar ($S$). This study, representing the first ATLAS search in this decay topology, sets upper limits on the cross section for resonant scenarios with …
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Comparison of pion- and proton- production of charmonium
… but the X(3555) dominates for protons. Simple gluon fusion accounts for X production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain X production by pions."
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Comparison of Pion- and Proton-Production of Charmonium
… the (chi)(3555) dominates for protons. Simple gluon fusion accounts for (chi) production by protons. This is reasonable considering the lack of valence antiquarks in the proton-beryllium system. Other mechanisms are needed to explain (chi) production by pions.
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Collinear divergences and factorization in perturbative QCD
… implemented on Higgs production by bottom quark fusion, and then extended to Higgs production by gluon fusion. After this the issue of gauge invariance in this collinear scheme is addressed and it is realized that the collinear scheme fails to be gauge invariant. A more general analysis of …
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Search for boosted Higgs boson decays to a pair of spin-0 particle in the 4b final state.
… GeV. The Higgs production mode considered was gluon-gluon fusion. Both the calibration and analysis is performed on data from proton-proton collisions at the center of mass energy of 13TeV, collected in 2016-2018, corresponding to an integrated luminosity of 138 f b−1. Lastly, the dissertation …
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Low energy consequences of some non-standard Higgs models
… boson. The loop induced decays of the Higgs to gluon and photon pairs are examined in two Little Higgs models - the Littlest Higgs Model and the Schmaltz Model. The production of Higgs pairs from gluon fusion, which proceeds via heavy quark loops, is also examined in these models. Another idea …
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A measurement of the contribution of the gluon to the spin of the nucleon
… contribution to the spin of the nucleon from the gluons mediating the strong force within the nucleon. The experimental data was obtained using the HERMES instrument at the Deustches Elektronen-Synchroton (DESY) in Hamburg, Germany during the year 2000. The effort was motivated by an earlier …
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Single muon production as a function of charged-particle multiplicity in proton-proton collisions at 8 TeV with ALICE at the LHC
… in the initial stages of the collision through gluon fusion, which is a dominant process at the LHC. The study of heavy flavour production in proton-proton collisions at the LHC, provides an important test of perturbative Quantum Chromodynamics (pQCD) calculations, particularly in the forward …
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D meson reconstruction at star using the silicon vertex tracker (svt)
… new deconfined partonic matter, called the Quark-Gluon Plasma. Charm quarks are expected to be produced predominately from the initial gluon fusion in parton-parton hard scatterings. This indicates that the production of the charm occurs at the early stages of the collision. At this time the …
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Applying SCET to parton showers
… from e+e- and for production of two jets via gluon fusion.
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Electroweak physics and evidence for a Higgs boson decaying to a pair of tau leptons with the CMS detector
… resonances decaying to a pair of tau leptons in gluon-fusion and b-quark associated production modes with no observation of a significant excess. In addition, the feasibility of measuring the standard model Higgs boson self-coupling with an expected data sample corresponding to an integrated …
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Placing limits on the Higgs production cross section at the tevatron using the H to W+W- to l+l- decay channel
… for Higgs produced by top-quark mediated gluon fusion and then decaying in to two W bosons. Only leptonic decay channel software considered, such that the final event signature consists of ee, eu, or uu with missing energy from undetected neutrinos. After an evaluation of alternative …
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First measurement of the gluon polarisation in the nucleon using D mesons at COMPASS
… measurements it is <br>possible to determine the gluon density in the nucleon with good accuracy via <br>a so-called QCD fit. <br>In the case of the spin structure of the nucleon the situation is different. Even after decades of experimental and theoretical efforts it remains to be understood how …