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Theoretical Physics

June 18, 2007

SLAC Theory Group

 

Theoretical Physics - Research Interests

The research of the Theoretical Physics Group ranges from fundamental theoretical questions to detailed
calculations and tests of theory relevant to particular experiments at SLAC and elsewhere.

• Superstring and M Theory

• Quantum gravity

• Physics at Bottom and Charm Factories

• Phenomenology of Supersymmetry and Grand Unified Theories

• Tests of the Standard Model

• QCD Phenomena

• Physics at the Next Linear Collider

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

• New Theoretical Methods

• Novel Detector Techniques

Superstring and M Theory

• Supersymmetry broken at the string scale
• Physics of Black Holes
• Geometric aspects of string theory, compactification and field theory/string theory correspondence
• Investigations of AdS-CFT correspondence
• Construction of gauge field theories with chiral fermions in higher dimensional gauge theories

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                                                                       Return to Top

• 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

• 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 in  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 Next Linear Collider                                                                         Return to Top

• 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
• A new fundamental theory of discrete physics; foundations of measurement theory
• 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
• CORE (Contractor Renormalization Group Method) for nonperturbative problems:
  e.g. anti-ferromagnets, t-J models and Hubbard models, and lattice QCD and other
  lattice field theories
• 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

Novel Detector Techniques

• Mathematical and computer algorithms for data analysis
• Studies of the  Landau-Pomeranchuk-Migdal effect

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Guadalupe Makasyuk                                                        SLAC Theory Group