A5101648676- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Noncommutative and Quantum Gravity Theories
- Scientific Research and Discoveries
- Recreation, Leisure, Wilderness Management
- Laser-Plasma Interactions and Diagnostics
- Quantum Electrodynamics and Casimir Effect
- Fluid Dynamics and Turbulent Flows
- High-pressure geophysics and materials
- Spectral Theory in Mathematical Physics
- Distributed and Parallel Computing Systems
- Religious Tourism and Spaces
- Diverse Aspects of Tourism Research
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Mathematical Approximation and Integration
University of Oklahoma
2013-2024
National Taiwan University
2013
Institute of Physics, Academia Sinica
2012
SLAC National Accelerator Laboratory
2008
Menlo School
2008
Fermi National Accelerator Laboratory
2007
University of Wisconsin–Madison
1997-2000
The University of Texas at Austin
1987-1998
University of Rochester
1995-1997
Florida State University
1992-1997
We calculate the relic density $({\ensuremath{\Omega}}_{{\ensuremath{\chi}}_{1}^{0}}{h}^{2})$ of neutralino dark matter in supergravity models with radiative electroweak symmetry breaking, for values Higgs sector parameter $\mathrm{tan}\ensuremath{\beta}\ensuremath{\equiv}{v}_{2}{/v}_{1}$ between two infrared fixed points top quark Yukawa coupling, $\mathrm{tan}\ensuremath{\beta}\ensuremath{\simeq}1.8$ and $\mathrm{tan}\ensuremath{\beta}\ensuremath{\simeq}56$. For...
The newly discovered "Higgs" boson h^0, being lighter than the top quark t, opens up new probes for flavor and mass generation. In general two Higgs doublet model, ct, cc tt Yukawa couplings could modify h^0 properties. If t --> ch^0 occurs at percent level, observed ZZ^* \gamma\gamma signal events may have accompanying cbW activity coming from t\bar{t} feeddown. We suggest that can be searched via ZZ^*, \gamma\gamma, WW^* b\bar{b}, perhaps even \tau^+\tau^- modes in events. Existing data...
A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral (FCNH) decay $\phi^0 \to t\bar{c}+\bar{t}c$, where $\phi^0$ could be a CP-even scalar ($H^0$) or CP-odd pseudoscalar ($A^0$). Measurement light 125 GeV boson ($h^0$) couplings at Large Hadron Collider (LHC) favor decoupling limit alignment 2HDM, in which gauge and diagonal fermion $h^0$ approach Standard Model values. In such limit, FCNH are naturally suppressed by small mixing parameter...
This report summarizes the work of Energy Frontier Top Quark working group 2013 Community Summer Study (Snowmass).
We investigate the prospects of indirect searches for supersymmetric neutralino dark matter. Relic neutralinos gravitationally accumulate in Sun and their annihilations produce high energy neutrinos. Muon neutrinos this origin can be seen large detectors like AMANDA, IceCube ANTARES. evaluate relic density detection rate several models---the minimal model, supergravity, supergravity with non-universal Higgs boson masses at grand unification scale. make realistic estimates rates including...
We determine the contribution to $\mathrm{pp}\ensuremath{\rightarrow}ZZ+X$ from $\mathrm{g}\mathrm{l}\mathrm{u}\mathrm{o}\mathrm{n}\phantom{\rule{0ex}{0ex}}+\phantom{\rule{0ex}{0ex}}\mathrm{g}\mathrm{l}\mathrm{u}\mathrm{o}\mathrm{n}\ensuremath{\rightarrow}\mathrm{ZZ}$ by evaluating relevant box diagrams.
We have examined the production of a charged Higgs boson in association with $W$ at high-energy hadron colliders, i.e., $\mathrm{pp}\ensuremath{\rightarrow}{W}^{\ifmmode\pm\else\textpm\fi{}}{H}^{\ensuremath{\mp}}+X$, and find that rates can be large. The various subprocesses which contribute to this mechanism tree one-loop levels are compared we quark annihilation $b\overline{b}$, $t\overline{t}\ensuremath{\rightarrow}{W}^{\ifmmode\pm\else\textpm\fi{}}{H}^{\ensuremath{\mp}}$ is dominant....
We present an analysis of the discovery reach for supersymmetric particles at upgraded Tevatron collider, assuming that SUSY breaking results in universal soft parameters grand unification scale, and lightest particle is stable neutral. first a review literature, including issues unification, renormalization group evolution supersymmetry effect radiative corrections on effective low energy couplings masses theory. consider experimental bounds coming from direct searches those arising...
We have used ISAJET 7.0/ISASUSY 1.0 to evaluate the rates and study distributions for trilepton events from leptonic decays of charginos neutralinos produced at Fermilab Tevatron via reaction, $p\bar p\rightarrow \tilde{W_1} \tilde{Z_2}$ + X cuts inspired by CDF D0 experiments. find that about 60\% these do not contain any jets, so should be easily identifiable over Standard Model backgrounds $t\bar{t}$ WZ production, provided decay $\tilde{Z_2}\rightarrow\tilde{Z_1}Z$ is kinematically...
Motivated by the recent discovery that radiative corrections can cause mass of lightest scalar Higgs boson ${\mathit{H}}_{\mathit{l}}$ minimal supersymmetric model (MSSM) to be in intermediate-mass range, we assess prospects for discovering MSSM bosons via their \ensuremath{\gamma}\ensuremath{\gamma} decay modes at Superconducting Super Collider (SSC) and CERN Large Hadron (LHC). We find if charged is not too light, it possible discover least one this mode within a few years operation SSC,...
We investigate the prospects for detectability of Higgs bosons minimal supersymmetric model (MSSM) at future colliders. First we delineate regions MSSM parameter space where various may be observable CERN ${e}^{+}{e}^{\ensuremath{-}}$ collider LEP 200 or hadron supercolliders, assuming (as usual) that Higgs-boson decay modes to particles are not allowed. find that, even with optimistic assumptions detector capabilities, there exist none visible. Next, show substantial rates decays large, and...
We investigate the prospects for discovering a top quark decaying into one light Higgs boson along with charm in pair production at CERN Large Hadron Collider (LHC). A general two doublet model is adopted to study signature of flavor changing neutral decay $t \to c\phi^0$, %or $\bar{t} \bar{c}\phi^0$ where $\phi^0$ could be CP-even ($H^0$) or CP-odd ($A^0$). The dominant physics background evaluated realistic acceptance cuts as well tagging and mistagging efficiencies. For reasonably large...
We examine the capability of a \ensuremath{\surd}s =2 TeV Fermilab Tevatron pp\ifmmode\bar\else\textasciimacron\fi{} collider to discover supersymmetry, given luminosity upgrade amass 25 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ data. compare with corresponding reach main injector (1 data). Working within framework minimal supergravity gauge coupling unification and radiative electroweak symmetry breaking, we first calculate regions parameter space accessible via clean trilepton signal from...
The $\mathrm{CP}$-odd Higgs boson ${A}^{0}$ of a nonminimal model possesses no tree-level couplings to vector-boson pairs. As result, many the techniques employed search for standard at Superconducting Super Collider (SSC) and CERN Large Hadron (LHC) are not likely be useful in searches ${A}^{0}$. This paper focuses on phenomenology production decay minimal supersymmetric model. We evaluate comprehensive set branching ratios (which includes all two-body one-loop decays into nonsupersymmetric...
The contribution to pp\ensuremath{\rightarrow}ZH+X from gluon fusion (gg\ensuremath{\rightarrow}ZH) is calculated by using three generations and four of quarks including both the triangle box diagrams.
The prospects for detecting trilepton events ($\ell = e$ or $\mu$) from chargino-neutralino ($\chi^\pm_1 \chi^0_2$) associated production are investigated the upgraded Fermilab Tevatron Collider in context of minimal supergravity model (mSUGRA). In some regions parameter space, $\chi^\pm_1$ and $\chi^0_2$ decay dominantly into final states with $\tau$ leptons contributions $\tau-$leptonic decays enhance signal substantially when soft cuts on lepton transverse momenta used. Additional sources...
We study properties of the lightest neutralino (χ0) and calculate its cosmological relic density in a supersymmetric U(1)′ model with secluded breaking sector (the S-model). The mass is smaller than minimal standard model; for instance, mχ0≲100 GeV limit that gaugino large compared to electroweak scale. find Zχ0χ0 coupling can be enhanced due singlino components extended sector. Neutralino annihilation through Z-resonance then reproduces measured cold dark matter over broad regions parameter space.
We evaluate cross sections for E${\mathrm{/}}_{\mathit{T}}$, 1l, and various dilepton multilepton event topologies that result from the simultaneous production of all sparticles at Fermilab Tevatron collider, both within minimal model framework as well in two different R-parity-violating scenarios. Our analysis assumes these R-violating couplings are small, their sole effect is to cause lightest supersymmetric particle decay inside detector. reassess future strategies sparticle searches...