Other Research Projects

Quantum Gravity

Quantum Gravity

  • Perturbative relationships between gravity and gauge theories
  • Multi-loop diagrams
  • Phenomenology of theories with higher dimensions
  • Study of collider signatures of TeV scale quantum gravity with large extra dimensions

Physics at Bottom and Charm Factories

  • Studies of CP violation and heavy flavor physics at PEP-II
  • CP violation beyond the Standard Model
  • Influence of new physics at the TeV scale on Kaon and Bs-decays
  • Determination of t-d couplings from radiative B and Bs decays
  • B physics at PEP-II in supersymmetry and left-right extensions of the Standard Model
  • Tau polarization asymmetry in B decays
  • Atomic alchemy: the atomic analogs of exclusive B decays; calculation of branching ratios for the decay of muonic atoms into electronic atoms
  • Production of polarized tau pairs and tests of CP violation in electron positron collisions
  • Radiative weak decays of charm mesons; D bar D mixing, and CP-violation in the charm system
  • Particle Data Group: B physics data compilations
  • CP violation in K decays
  • Searching for supersymmetry in rare B decays
  • Rare decays and new physics
  • Dynamics of heavy particle decays
  • Exact light-cone wavefunction representation of exclusive B decays
  • Three-body B-decays
  • The BaBar Physics Book

Phenomenology of Supersymmetry and Grand Unified Theories

Phenomenology

  • R-parity violation, collider signals for supersymmetric top, Higgs, neutrinos
  • R-parity violating sneutrino interactions at lepton and hadron colliders
  • Reactions in gauge-mediated supersymmetry
  • Unified SUSY models explaining b-quark deviations at SLC and LEP
  • Dynamical explanations for the masses and mixing angles of quarks and leptons

Tests of the Standard Model

  • Study of WW scattering to t tbar as a probe of the strongly interacting Higgs sector
  • Investigation of CP violation in tau lepton decay
  • Top-charm associated production inĀ  e+e- collisions
  • models for baryogenesis; neutrino and Sneutrino mixing and oscillation
  • sterile neutrinos

QCD Phenomena

  • Pomeron-odderon interference in diffractive photoproduction of heavy quarks
  • Disordered chiral condensate phenomena
  • Applications of light-front quantization to phenomenology
  • Calculation of four-jet production
  • Commensurate scale relations and scheme-invariant predictions
  • Inclusion of mass-threshold effects into the running of the QCD coupling and the analytic extension of the MSbar scheme
  • Commensurate scale relations -- high precision tests of QCD and the Standard Model without renormalization scale and scheme ambiguity
  • Anomalous polarization of quarkonium in hadron collisions
  • The role of the color-octet mechanism in hadronic production of quarkonium
  • Heavy sea quark structure of hadron wavefunctions and double quarkonium hadroproduction
  • Perturbative QCD constraints on the shape of polarized structure functions
  • Anomalous angular correlations and higher twist effects in the Drell-Yan process and semi-inclusive pion production
  • Studies of diffractive lepto-production of vector mesons in QCD; tests of QCD color transparency and the gluon structure function at low x
  • Coherent QCD phenomena: the Landau-Pomeranchuk-Migdal Effect in QED and QCD; quark energy loss in matter
  • Effects of multiple scattering and target structure on photon emission
  • Leading charm and bottom production and coalescence mechanisms in hadron collisions
  • Model-independent relation between the proton magnetic moment and the nucleon axial coupling
  • Search for disoriented QCD chiral condensate and studies of intermittency at large pseudo-rapidities
  • Theory of hard-diffraction related to observations at HERA
  • Gluon radiation in diffractive electroproduction
  • The quark/antiquark asymmetry of the nucleon sea
  • Scale-fixed predictions for meson form factors and other exclusive reactions
  • Probing contact interactions at high-energy lepton colliders
  • Rapidity gaps in perturbative QCD
  • Novel QCD effects in the production and decay of quarkonium
  • The Drell-Yan process in nuclei and factorization in impact parameter space
  • Signatures of color octet quarkonium production

Physics at the International Linear Collider

  • Testing Supersymmetry and Extensions of the Standard Model at the NLC exploiting polarized beams
  • Production of charginos, leptoquarks, and supersymmetric particles
  • Probes of anomalous chromodynamic, weak and flavor-changing couplings at the NLC
  • High energy photon-photon collisions at the Next Linear Collider
  • Studies of WW scattering at a photon-photon linear collider
  • Tests of anomalous moments in the Standard Model in polarized electron-photon collisions
  • Studies of the QCD Pomeron in virtual two-photon scattering
  • Using final state gluons as probes of anomalous top quark couplings at the NLC
  • The polarization asymmetry in photon electron collisions at the NLC and triple gauge boson couplings
  • The polarization asymmetry and triple gauge boson couplings in gamma e collisions at the NLC
  • Probing flavor changing neutral current top couplings at the NLC
  • Tests of the Standard Model and QCD at SLC and LEP
  • Higher order effects in measuring electron polarization at the SLC
  • New approaches to efficient analytic calculation of higher-order amplitudes in gauge theory, particularly QCD, including processes with large numbers of legs
  • Applications to hadron colliders and to three and four-jet decays of polarized Z's at the SLC
  • Rapidity Gaps and color coherence in electron-positron collisions
  • Renormalization scale effects and tests of QCD in jet production
  • Anomalous couplings of quarks and leptons
  • Effects of new physics in the decay of the Z to bottom and bottom-strange channels
  • Foundations of electroweak symmetry breaking
  • Baryogenics and Standard Model CP-violation
  • Probing violations of CPT and quantum mechanics in kaon decays and kaon pair production
  • Improved high order QED corrections to anomalous leptonic moments
  • New method for the production of relativistic anti-hydrogen
  • The strong coupling constant in Grand Unified Theories
  • Kaon decays beyond the Standard Model
  • Probing supersymmetry in rare B decays
  • Asymmetric quark/anti-quark hadronization in electron-positron annihilation
  • Phenomenological implications of low-energy supersymmetry breaking
  • Hadroproduction of quarkonia in fixed target experiments

Probes of Extended Gauge Sectors at Hadron and Electron-Proton Colliders

  • Models of electroweak symmetry breaking by new strong interactions and their implications
  • Probes of anomalous top-quark couplings at hadron colliders
  • Production of new gauge bosons and leptoquarks at TeVatron, LHC, and future hadron colliders
  • Tests of light gluinos
  • The electroweak symmetry breaking Higgs boson in models with top quark condensation
  • Constraints on anomalous top quark couplings at the LHC
  • Searches for scalar and vector leptoquarks at future hadron colliders
  • Searches for new gauge bosons at future colliders
  • Nuclear effects at HERA

New Theoretical Methods

  • Object-oriented programming applied to simulation problems in physics
  • Light-cone Fock state methods in nonperturbative QCD
  • Nonperturbative renormalization of QED in light cone quantization
  • The relation of BLM and Pade methods for resumming perturbative QCD
  • Spontaneous symmetry breaking in supersymmetric Yang-Mills theories
  • Superstring theory model-building and phenomenology
  • Extension of eikonal methods developed for beamstrahlung studies to the analysis of the suppression of radiation in a medium with multiple scattering, including effects of finite target thickness and of multiple targets
  • One-loop amplitudes for multijet production
  • Power corrections, renormalons and resummation
  • Multiple scattering and functional integrals
  • Unitarity based techniques for one loop calculations in QCD
  • Precision corrections in the minimal supersymmetric Standard Model