A5051007262- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Quantum Mechanics and Non-Hermitian Physics
- Quantum chaos and dynamical systems
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Nonlinear Waves and Solitons
- Pulsars and Gravitational Waves Research
- Algebraic and Geometric Analysis
- International Science and Diplomacy
- Atomic and Molecular Physics
- Scientific Research and Discoveries
University of Illinois Chicago
2014-2023
National Center for Theoretical Sciences
2002-2019
National Center for Theoretical Sciences, Physics Division
2008-2019
University of California, Santa Barbara
2015
University of Wisconsin–Madison
1979-2012
Brookhaven National Laboratory
1981-2012
National Tsing Hua University
1996-2008
Institute of Physics, Academia Sinica
2008
University of Illinois Urbana-Champaign
1989-2006
Fermi National Accelerator Laboratory
1989-2000
We show that the quark mixing matrix can be parametrized in exactly unitary forms with imaginary parts present only at order of ${10}^{\ensuremath{-}3}$. With ${s}_{x}={s}_{1}$ and ${s}_{y}$ well determined, measurements ${\ensuremath{\epsilon}}^{\ensuremath{'}}$ or other $\mathrm{CP}$-nonconservation effects determine ${s}_{z}{s}_{\ensuremath{\varphi}}$. Then after $|{V}_{\mathrm{ub}}|\ensuremath{\simeq}{s}_{z}$ is measured, ${s}_{\ensuremath{\varphi}}$ known. also give a simple expression...
A possibility of a very clean signature for the production ${{W}_{R}}^{\ifmmode\pm\else\textpm\fi{}}$ is pointed out. If right-handed neutrino lighter than ${{W}_{R}}^{\ifmmode\pm\else\textpm\fi{}}$, left-right symmetric gauge theory predicts decay ${{W}_{R}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{+}+2$ hadronic jets, with branching ratio \ensuremath{\sim}3%. The lack neutrinos in final state and absence sizable background make rather easy to detect (if it...
We calculate a new type of two-loop contribution to the electric dipole moments electron and neutron in supersymmetric theories. The contributions are originated from potential $\mathrm{CP}$ violation trilinear couplings Higgs bosons scalar-top or scalar-bottom quarks. These did not receive stringent constraints directly. induced through mechanism analogous that due Barr Zee [Phys. Rev. Lett. 65, 21 (1990)]. find observable effects for sizable portion parameter space related third generation...
Phenomenology of the notion an unparticle $\mathcal{U}$, recently perceived by Georgi, to describe a scale invariant sector with nontrivial infrared fixed point at higher energy is explored in details. Behaving like collection ${d}_{\mathcal{U}}$ (the dimension operator ${\mathcal{O}}_{\mathcal{U}}$) invisible massless particles, this can be unveiled measurements various distributions for processes $Z\ensuremath{\rightarrow}f\overline{f}\mathcal{U}$ and...
A neutral dark matter particle may possess an electric dipole moment (EDM) or a magnetic (MDM), so that its scattering with nuclei is governed by electromagnetic interactions. If the moments are associated relevant operators of dimension-5, they be detectable in direct search experiments. We calculate complete expressions cross sections and recoil energy spectra for these attributes. also provide useful formulae pertinent to interacts via charge form factor (CFF) which related radius defined...
Assuming that the positron excess in PAMELA satellite data is a consequence of annihilations cold dark matter, we consider from model-independent perspective if show preference for spin matter. We then perform general analysis into two-body final states to determine what weighted combination channels best describes data.
We investigate the isodoublet vector leptoquark ${V}_{2}$ as a solution to $B$ anomalies ${R}_{K,{K}^{*}}$ and ${R}_{D,{D}^{*}}$, well explaining muon electron anomalous magnetic moments very recent $W$-mass anomaly.
The two--loop mechanism of Bjorken and Weinberg is used to constrain flavor changing neutral Higgs bosons. We calculate the complete set diagrams for rare decay $\mu \rightarrow e + \gamma$ induced by such bosons, arbitrary top masses. analytic result limits on masses some recent models with specific ansatz about couplings. For example, in Cheng--Sher scenario multi-Higgs doublet models, all bosons possess ($f_i \leftrightarrow f_j)$ couplings proportional $\sqrt{m_i m_j}$. find that present...
Low-energy phenomenology of the unparticle physics associated with an exact scale invariant sector possessing a nontrivial infrared fixed point at higher energy is explored for both electron-positron and hadronic colliders. Feynman rules spin 0, 1, or 2 coupled to variety standard model gauge operators that are relevant many low-energy processes involving either real emissions unparticles their virtual propagator effects presented. Missing and/or recoil mass distributions in production...
Decays of a Higgs scalar in the mass range ${m}_{W}\ensuremath{\lesssim}{m}_{H}\ensuremath{\lesssim}2{m}_{W}$ (${m}_{W}={W}^{\ifmmode\pm\else\textpm\fi{}}$ \ensuremath{\simeq} 83 GeV) are examined. For ${m}_{H}\ensuremath{\gtrsim}125$ GeV, branching ratio for $H\ensuremath{\rightarrow}{W}^{\ifmmode\pm\else\textpm\fi{}}+X$ is found to be substantial, provided top quark heavy, ${m}_{t}>\frac{{m}_{H}}{2}$. Implications our results hadron-hadron-collider experiments briefly discussed.
The presence of a massless boson coupled to neutrinos in the Gelmini-Roncadelli gauge model can be tested $\ensuremath{\pi}$,$K$ leptonic decays and wrong-sign single-lepton production by neutrinos. We place bounds on Majoron-neutrino couplings from experimental limits these processes.
A measurement of the Lamb shift in muonic hydrogen yields a charge radius proton that is smaller than CODATA value by about 5 standard deviations. We explore possibility new scalar, pseudoscalar, vector, and tensor flavor-conserving nonuniversal interactions may be responsible for discrepancy. consider exotic particles that, among leptons, couple preferentially to muons mediate an attractive nucleon-muon interaction. find many constraints from low energy data disfavor spin-0, spin-1, spin-2...
We show how the standard electroweak gauge model can be naturally generalized to SU(2) \ifmmode\times\else\texttimes\fi{} U(1) SU(2)', which has twice number of bosons model. All known fermions transform with respect U(1); spontaneous symmetry breaking is achieved a scalar quartet links and SU(2)' usual doublet. The interaction Hamiltonian at low energy reproduces low-energy phenomenology high-energy predictions are explored. One $W$ one $Z$ less massive than corresponding These light...
This report summarizes the work of Energy Frontier Top Quark working group 2013 Community Summer Study (Snowmass).
Whilst the prospect of new Z′ gauge bosons with only axial couplings to Standard Model (SM) fermions is widely discussed, examples anomaly-free renormalisable models are lacking in literature. We look remedy this by constructing several motivated examples. Specifically, we consider vectors which couple universally all SM fermions, as well those generation-specific, leptophilic, and leptophobic. Anomaly cancellation typically requires presence coloured charged chiral argue that a large class...
We calculate the dominant contributions to muon $g\ensuremath{-}2$ at two-loop level due a generic pseudoscalar boson that may exist in any exotic Higgs sector most extensions of standard model. The leading effect comes from diagrams Barr-Zee type. A sufficiently light can give rise as large electroweak contribution which is measurable next round experiments. Through we here, anticipated improved data recent future on put best limit possible existence physics beyond
The forward-backward asymmetry measurement in top-pair production at the Tevatron is about $2\ensuremath{\sigma}$ from standard model prediction. We propose an asymmetric left-right model, which includes a ${W}^{\ensuremath{'}}$ boson with right-handed coupling of down to top quark, and ${Z}^{\ensuremath{'}}$ diagonal couplings up, top, quarks ${M}_{{W}^{\ensuremath{'}}}\ensuremath{\approx}175\text{ }\text{ }\mathrm{GeV}$ ${M}_{{Z}^{\ensuremath{'}}}\ensuremath{\approx}900\text{...
We study the production and subsequent decays of S- P-wave quarkonium states a heavy quark that may be produced at multi-TeV hadron collider. Our considerations are focused on lighter member fourth-generation doublet, for which weak expected to suppressed by mixing angles. For masses \ensuremath{\lesssim}1 TeV, dominant is via gluon fusion. In addition decay channels present in charm bottom systems, quarkonia can into ${W}^{+}$${W}^{\mathrm{\ensuremath{-}}}$, ${Z}^{0}$${Z}^{0}$,...
We examine the problems of calculating leading relativistic corrections to heavy-quarkonium decays [relative $O({v}^{2})$] within context QCD. The incorporation constituent motion in a consistent manner poses nontrivial associated with gauge invariance and multiple counting higher-order contributions coupling constant. Although we were unable resolve these questions completely satisfactory manner, present an improved static limit where kinematic are included through binding effects. Our...
The standard SU(2) \ensuremath{\bigotimes} U(1) model is extended to include two $W$ and $Z$ bosons without changing the structure of its low-energy phenomenology. experimental implications this regarding existence a light are discussed.