Showing papers by "Zack Sullivan published in 2005"
TL;DR: In this paper, the correlated angular distributions of final-state particles in both single-top-quark production and the dominant $Wjj$ backgrounds can be reliably predicted, and a set of cuts that can improve the single topquark discovery significance by 25% and the signal to background ratio by a factor of 3 with very little theoretical uncertainty is proposed.
Abstract: I demonstrate that the correlated angular distributions of final-state particles in both single-top-quark production and the dominant $Wjj$ backgrounds can be reliably predicted. Using these fully correlated angular distributions, I propose a set of cuts that can improve the single-top-quark discovery significance by 25%, and the signal to background ratio by a factor of 3 with very little theoretical uncertainty. Up to a subtlety in $t$-channel single-top-quark production, leading-order matrix elements are shown to be sufficient to reproduce the next-to-leading order correlated distributions.
60 citations
Posted Content•
TL;DR: In this article, the properties of Higgs bosons in the Standard Model and its various extensions are reviewed, and the potential of the ILC operated at centre-of-mass energies up to 1 TeV (including the gamma gamma option) for the determination of the Higgs properties.
Abstract: This report reviews the properties of Higgs bosons in the Standard Model (SM) and its various extensions. We give an extensive overview about the potential of the ILC operated at centre-of-mass energies up to 1 TeV (including the gamma gamma option) for the determination of the Higgs boson properties. This comprises the measurement of the Higgs boson mass, its couplings to SM fermions and gauge bosons, and the determination of the spin and the CP quantum numbers of the Higgs. The extensions of the SM that are analyzed in more detail are heavy SM-like Higgs bosons, heavy Higgs bosons in the framework of Supersymmetry (SUSY) and further exotic scenarios. We review recent theoretical developments in the field of Higgs boson physics. The important question what the ILC can contribute to Higgs boson physics after the LHC, the LHC/ILC interplay and synergy is discussed. The impact of Higgs boson physics on cosmology in several SUSY frameworks is analyzed. The impact of the accelerator and dector performance on the precision of measurements are discussed in detail. We propose a strategy to optimize future analyses. Open questions arising for the various topics are listed, further topics of study and corresponding roadmaps are suggested.
44 citations
01 Nov 2005
TL;DR: In this paper, the properties of Higgs bosons in the Standard Model and its various extensions are reviewed, and the potential of the ILC operated at center-of-mass energies up to 1 TeV (including the γγ collider option) for the determination of the Higgs properties.
Abstract: This report reviews the properties of Higgs bosons in the Standard Model (SM) and its various extensions. We give an extensive overview of the potential of the ILC operated at center-ofmass energies up to 1 TeV (including the γγ collider option) for the determination of the Higgs boson properties. This includes the measurement of the Higgs boson mass, its couplings to SM fermions and gauge bosons, and the determination of the spin and the CP quantum numbers of the Higgs. We also discuss extensions of the SM, including heavy SM-like Higgs bosons, heavy Higgs bosons in the framework of Supersymmetry (SUSY) and more exotic scenarios. We review recent theoretical developments in the field of Higgs boson physics, and the impact of Higgs boson physics on cosmology in several SUSY frameworks is considered. The important questions as to what the ILC can contribute to Higgs boson physics after the LHC, the LHC/ILC interplay and synergy, are addressed. The impact of the accelerator and detector performance on the precision of measurements are discussed in detail and we propose a strategy to optimize future analyses. Open questions arising for the various topics are listed, and further topics of study and corresponding roadmaps are suggested.
12 citations
01 Jan 2005
TL;DR: In this article, the properties of Higgs bosons in the Standard Model and its various extensions are reviewed, and the potential of the ILC operated at center-of-mass energies up to 1 TeV (including the γγ collider option) for the determination of the Higgs properties.
Abstract: This report reviews the properties of Higgs bosons in the Standard Model (SM) and its various extensions. We give an extensive overview of the potential of the ILC operated at center-of-mass energies up to 1 TeV (including the γγ collider option) for the determination of the Higgs boson properties. This includes the measurement of the Higgs boson mass, its couplings to SM fermions and gauge bosons, and the determination of the spin and the CP quantum numbers of the Higgs. We also discuss extensions of the SM, including heavy SM-like Higgs bosons, heavy Higgs bosons in the framework of Supersymmetry (SUSY) and more exotic scenarios. We review recent theoretical developments in the field of Higgs boson physics, and the impact of Higgs boson physics on cosmology in several SUSY frameworks is considered. The important questions as to what the ILC can contribute to Higgs boson physics after the LHC, the LHC/ILC interplay and synergy, are addressed. The impact of the accelerator and detector performance on the precision of measurements are discussed in detail and we propose a strategy to optimize future analyses. Open questions arising for the various topics are listed, and further topics of study and corresponding roadmaps are suggested.
2 citations
Posted Content•
TL;DR: In this article, the authors argue that a terascale photon collider is necessary to determine the structure of the photon at 100 GeV, and that uncertainties in photon parton distribution functions lead to cross section predictions that vary by a factor of 5.
Abstract: We do not understand light. I argue that a terascale photon collider is necessary to determine the structure of the photon at 100 GeV. Uncertainties in photon parton distribution functions lead to cross section predictions that vary by a factor of 5. This limits our ability to predict how well we can perform precision measurements, e.g., extracting the width of Higgs into two photons. These uncertainties will only be resolved by measuring the gluonic structure of the photon in situ.
1 citations
TL;DR: A few changes to the routines that calculate CTEQ parton distribution functions allow modern compilers to optimize the evaluations, while having no quantitative effect on the results.