A5021943677- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Noncommutative and Quantum Gravity Theories
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Relativity and Gravitational Theory
- Advanced NMR Techniques and Applications
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Scientific Computing and Data Management
- Physics of Superconductivity and Magnetism
Northeastern University
2015-2024
Universidad del Noreste
2000-2024
Texas A&M University
1989-2015
Princeton University
2015
California Institute of Technology
2015
University of California, Santa Barbara
1996-2013
European Organization for Nuclear Research
1976-2010
University of California, Irvine
2010
University of Hawaii System
2010
Rice University
2010
A locally supersymmetric grand unification program is proposed which couples the $N=1$ supergravity multiplet to an arbitrary unified gauge group with any number of left-handed chiral multiplets and a vector multiplet. specific model discussed where it shown that not only do gravitational interactions eliminate degeneracy vacuum state encountered in global supersymmetry, but simultaneously they can break both supersymmetry SU(2) \ensuremath{\bigotimes} U(1) down residual...
Naturalness bounds on weak scale supersymmetry in the context of radiative breaking electroweak symmetry are analyzed. In case minimal supergravity it is found that for low $\mathrm{tan}\ensuremath{\beta}$ and values fine-tuning $\ensuremath{\Phi},$ where $\ensuremath{\Phi}$ defined essentially by ratio ${\ensuremath{\mu}}^{2}{/M}_{Z}^{2}$ $\ensuremath{\mu}$ Higgs mixing parameter ${M}_{Z}$ $Z$ boson mass, allowed universal scalar ${m}_{0},$ gaugino mass ${m}_{1/2}$ lie surface an ellipsoid...
An analysis is given of the Stueckelberg extension standard model with a hidden sector gauge group $U(1{)}_{X}$ where mass growth for extra boson occurs via mechanism, and kinetic mixing in $U(1{)}_{X}\ifmmode\times\else\texttimes\fi{}U(1{)}_{Y}$ included. Such generic broad class supergravity string models. We carry out detailed global fit precision CERN LEP data on off $Z$ pole, ${\ensuremath{\chi}}^{2}$ within 1% fit. Further, it shown that, absence matter sector, there single effective...
An analysis of the neutron EDM and electron in minimal $N=1$ supergravity unification with two $\mathrm{CP}$-violating phases is given. For includes complete one loop gluino, chargino, neutralino exchange diagrams for electric dipole chromoelectric operators, also contribution purely gluonic dimension-six operator. It shown that there exist significant regions six-dimensional parameter space model where cancellations between gluino chargino exchanges reduce contributions, further among...
Recently WMAP has measured the cosmological parameters to a much greater accuracy. We analyze implications of this more precise measurement for supersymmetric dark matter and direct detection supersymmetry at accelerators. consider MSUGRA including also hyperbolic branch (HB) in radiative breaking electroweak symmetry. On part where lightest neutralino is dominantly Higgsino rather than being mostly B-ino, relic density constraints are satisfied by coannihilation with next light chargino....
A detailed analysis of predictions SU(5) supergravity grand unification within the framework radiative breaking SU(2)\ifmmode\times\else\texttimes\fi{}U(1) is given. The masses 31 new supersymmetric particles depend on only four parameters. full parameter space explored and found to be strongly restricted by proton decay bounds if one requires no extreme fine tuning Higgs triplet mass \ensuremath{\le}3${\mathit{M}}_{\mathit{G}}$. sparticle are then correlated, e.g.,...
An analysis of the electric dipole moment (EDM) neutron and lepton in minimal supersymmetric standard model (MSSM) with most general allowed set $\mathrm{CP}$ violating phases without generational mixing is given. The includes contributions from gluino, chargino neutralino exchanges to operator, chromoelectric purely gluonic dimension six operator. It found that EDMs depend only on certain combinations phases. independent such classified. given here provides framework for exploration effects...
A quantitative analysis of ${\mathit{a}}_{\mathrm{\ensuremath{\mu}}}$\ensuremath{\equiv}1/2(g-2${)}_{\mathrm{\ensuremath{\mu}}}$ within the framework supergravity grand unification and radiative breaking electroweak symmetry is given. It found that ${\mathit{a}}_{\mathrm{\ensuremath{\mu}}}^{\mathrm{SUSY}}$ dominated by chiral interference term from light chargino exchange, this carries a signature which correlates strongly with sign \ensuremath{\mu}. Thus as rule...
An analysis is given of the effects nonuniversal soft supersymmetry-breaking masses in Higgs sector and third generation squark sector, it shown that they are highly coupled. Nonuniversality on dark matter event rates neutralino-nucleus scattering analyzed. It found maximal range ${m}_{{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}}_{1}}<~65$ GeV where relic density governed by $Z$ poles. In this minimum can be increased or decreased factors $\ensuremath{\sim}10$...
The recent positron excess observed in the PAMELA satellite experiment strengthens previous experimental findings. We give here an analysis of this framework Stueckelberg extension standard model which includes extra $U(1{)}_{X}$ gauge field and matter hidden sector. Such can produce right amount dark consistent with Wilkinson Microwave Anisotropy Probe (WMAP) constraints. Assuming sector to be Dirac fermions it is shown that their annihilation energy dependence seen HEAT, AMS, experiments....
The effective Lagrangian which gives a full solution of the U(1) problem is obtained from $\frac{1}{N}$ expansion quantum chromodynamics. This satisfies all anomalous $n$-point Ward identities for arbitrary ${q}^{2}$, and includes chiral SU(3) breaking. relationship between ${\ensuremath{\eta}}^{\ensuremath{'}}$ mass $\ensuremath{\theta}$ dependence vacuum energy in absence quarks form strong $\mathrm{CP}$ violation effective-Lagrangian framework are deduced.
The effective Lagrangian which exhibits explicitly the transmission of CP-violating phases induced via electroweak gaugino masses below scale spontaneous breaking SU(2${)}_{\mathit{L}}$\ifmmode\times\else\texttimes\fi{}${\mathrm{U}}_{\mathit{y}}$(1) gauge symmetry is deduced. formalism used to compute one-loop electric dipole moment electron including full set neutralino states. Contributions neutralinos other than photino are found be significant. It shown that current data excludes maximal...
A general analysis of nucleon decay in supergravity unified models is given including the full set W-gaugino, gluino, and Z-gaugino dressing diagrams (with gauge as well Yukawa interactions at vertices) LLLL RRRR dimension-five operators generated by Higgs-triplet exchange. The carried out within framework a model-independent formalism SU(2)\ifmmode\times\else\texttimes\fi{}U(1) breaking models. Full symmetry-breaking effects on vertices all allowed mass splittings supersymmetric particles...
LHC-7 has narrowed down the mass range of light Higgs boson. This result is consistent with supergravity unification framework, and current boson window implies a rather significant loop correction to tree value, pointing relatively heavy scalar sparticle spectrum universal boundary conditions. It shown that largest value obtained on hyperbolic branch radiative breaking. The implications in broader 115 GeV 131 narrower 123 127 are explored context discovery supersymmetry at for observation...
The effects of nonuniversality gaugino masses on dark matter are examined within supersymmetric grand unification, and in string D-brane models with R parity invariance. In SU(5) unified the sector can be generated via gauge kinetic energy function which may depend 24, 75 200 dimensional Higgs representations. We also consider allow for where arises from embeddings standard model group five-branes nine-branes. It is found that mass range LSP extended much beyond allowed universal SUGRA case,...