64 papers organized by research program. ~10,000 total citations.
From model-dependent benchmarks to model-independent frameworks: redesigning how LHC searches are performed, presented, and reinterpreted.
JHEP 04 (2014) 117
Projects the discovery reach and exclusion limits for supersymmetric simplified models at the 14 TeV LHC and future 33 and 100 TeV proton colliders, finding that a 100 TeV machine can discover gluinos below 11 TeV.
Snowmass 2013 whitepaper
Compares the physics reach of 14, 33, and 100 TeV proton colliders using SUSY simplified models as benchmarks, contributing to the community assessment of future collider options.
Phys. Rev. D 88 (2013) 093006
Evaluates the potential of a same-sign dilepton plus two b-jet search for tth production, providing direct access to the top Yukawa coupling without dependence on loop-level couplings or Higgs width uncertainties.
JHEP 09 (2013) 061
Provides a complete map of the CMSSM parameter space consistent with the Higgs mass and dark matter abundance, organizing viable regions by dark matter mechanism and presenting benchmark models with their 13 TeV LHC signatures.
Phys. Rev. D 85 (2012) 055029
Introduces a new class of BSM searches that recluster events into large-radius fat jets and require multiple massive jets, improving sensitivity to high-multiplicity signals including R-parity violating gluino decays by 20-50% in mass reach.
unpublished
Studies the possibility of light gluinos with R-parity violating decays at the Tevatron, exploring reconstruction techniques for these challenging multijet final states.
JHEP 01 (2012) 074
Develops a comprehensive set of simplified models for LHC final states with top and bottom quarks, optimizing search strategies for pair-produced color octets and triplets, and providing benchmarks that ensure optimal coverage of heavy flavor new physics.
J. Phys. G 39 (2012) 105005
A systematic catalog of simplified models for new-physics searches at the LHC, defining minimal effective Lagrangians with few new particles whose masses and cross-sections map directly to observable quantities. Output of the SLAC workshop on Topologies for Early LHC Searches.
JHEP 10 (2011) 012
Optimizes jets + missing energy search strategies for early 7 TeV LHC data, mapping sensitivity across simplified model spectra and providing concrete recommendations for kinematic cuts and signal regions.
Phys. Lett. B 702 (2011) 64-68
Reinterprets the first ATLAS supersymmetry search with 70/nb of data, showing that gluino masses below 205 GeV are disfavored regardless of LSP mass, already surpassing the Tevatron reach for compressed spectra.
JHEP 12 (2010) 030
Develops search strategies for new physics at the LHC that improve sensitivity by combining multiple signal regions and optimizing for broad coverage across simplified model mass planes.
Nucl. Phys. Proc. Suppl. 200-202 (2010) 185-417
A comprehensive overview of new physics possibilities at the LHC, covering electroweak symmetry breaking, dark matter, extra dimensions, supersymmetry, hidden sectors, and TeV-scale strings, intended as a companion to the ATLAS and CMS Technical Design Reports.
Phys. Rev. D 79 (2009) 115006
Shows that a Higgs boson decaying to light pseudoscalars can be discovered via the subdominant channel where one pseudoscalar decays to muon pairs, enabling coverage at the Tevatron and early LHC even when the pseudoscalar mass is below 10 GeV.
Phys. Rev. D 79 (2009) 015005
Proposes a model-agnostic approach to jets + missing energy searches at the LHC by defining kinematic bins and publishing differential cross-section limits that can be reinterpreted for any BSM model producing the same final state.
Phys. Lett. B 666 (2008) 34-37
Shows how to search the complete kinematic parameter space for pair-produced color octets decaying to two jets plus missing energy at the Tevatron, demonstrating that CMSSM-motivated cuts cause existing searches to miss discoverable spectra.
Int. J. Mod. Phys. A 23 (2008) 4637-4646
Conference proceedings reviewing search strategies for gluinos at the Tevatron and the upcoming LHC, summarizing the model-independent approach to jets plus missing energy searches.
Studies extensions of the Standard Model where the Higgs decays via a cascade to four tau leptons and shows that multi-lepton excesses could be visible at the Tevatron with 6 fb^-1 for a 110 GeV Higgs.
From composite inelastic dark matter to the SIMP miracle: exploring strongly interacting dark sectors, sub-GeV dark matter, and the experimental program they motivate.
Phys. Rev. Lett. 115 (2015) 021301
Provides the first calculable realization of the SIMP mechanism using a QCD-like hidden sector where pseudo-Nambu-Goldstone bosons are the dark matter and the Wess-Zumino-Witten term mediates the 3-to-2 number-changing process.
Phys. Rev. Lett. 113 (2014) 171301
Introduces the SIMP paradigm in which the thermal relic abundance is set by 3-to-2 self-annihilations in a hidden sector that remains in kinetic equilibrium with the Standard Model. Predicts light (MeV-GeV) dark matter with sizable self-interactions.
unpublished
Studies the connection between the top Yukawa coupling and dark matter, exploring how the Higgs-top interaction constrains and motivates dark sector models.
JHEP 10 (2012) 134
Uses Fermi-LAT data below 5 GeV from the inner Galaxy to constrain the ratio of continuum to monochromatic photons from dark matter annihilation, excluding neutralino dark matter as an explanation for the reported 130 GeV gamma-ray line.
JHEP 03 (2016) 149
Proposes a method to extract the local dark matter phase-space distribution from directional detection data, decomposing the distribution function in moments of a model-independent basis and showing that O(1000) events can measure deviations from the Standard Halo Model.
Adv. High Energy Phys. 2011 (2011) 709492
Proposes a class of supersymmetric composite dark matter models where Standard Model interactions communicate SUSY breaking to the dark sector, computing the bound state spectrum with leading supersymmetry effects using a general formalism independent of binding dynamics.
Adv. High Energy Phys. 2011, 859762
Computes model-independent limits on new Abelian vector bosons kinetically mixed with Standard Model hypercharge, using data from e+e- experiments across the 1 GeV to 1 TeV mass range. Bounds the kinetic mixing parameter to epsilon < 0.03 for most masses studied.
Phys. Rev. D 82 (2010) 031901
Assesses the prospects for upcoming direct detection experiments to test the inelastic dark matter interpretation of the DAMA signal, identifying the experimental benchmarks needed to confirm or exclude the scenario.
JHEP 1006:113 (2010)
Works out the early-universe cosmology of composite inelastic dark matter, including the synthesis of constituent quarks into dark mesons and baryons, finding qualitatively different configurations depending on the mass hierarchy of the hidden sector.
J. Math. Phys. 52 (2011) 062102
Studies the spectrum of supersymmetric bound states, computing degeneracies in supersymmetric hydrogen and emphasizing the general features of non-relativistic supersymmetric bound state systems.
Phys. Rev. D 82 (2010) 055023
Shows that higher-dimensional operators in composite inelastic dark matter introduce parity violation, creating an admixture of inelastic and elastic scattering channels consistent with direct detection experiments even at near-maximal parity violation.
Phys. Rev. D 81 (2010) 096005
Shows how directional dark matter detectors can distinguish between different dark matter scattering dynamics, including elastic, inelastic, and momentum-dependent interactions.
Phys. Lett. B 692 (2010) 323-326
Proposes that the DAMA annual modulation signal arises from hyperfine transitions of composite dark matter, a meson from a QCD-like hidden sector whose spin-spin interactions produce the O(100 keV) mass splitting required for inelastic scattering.
unpublished
Explores gauge coupling unification and dark matter in a minimal extension of the Standard Model with additional scalar fields, studying the interplay between unification constraints and the dark matter relic density.
Phys. Rev. D 69:065022 (2004)
Investigates the scalar dark matter candidate in the Little Higgs theory-space model, performing a thermal relic density calculation and finding two viable mass regions — around 100 GeV and above 500 GeV — where the dark matter is an admixture of SU(2) triplet and singlet.
The Higgs as a pseudo-Goldstone boson protected by collective symmetry breaking, an alternative to supersymmetry for solving the hierarchy problem.
JHEP 06 (2010) 041
Constructs Little Higgs models from simple groups that generate the Higgs quartic coupling through collective symmetry breaking, extending the theory-space approach to new group-theoretic structures.
Int. J. Mod. Phys. A 20 (2005) 7412-7422
Studies the potential of electron-electron collisions to probe the spectrum and couplings of the Littlest Higgs model.
unpublished
Studies composite vector mesons in the context of the Little Higgs program, connecting QCD-like dynamics to the gauge boson partners predicted by theory-space models.
Phys. Rev. D 69 (2004) 115008
Studies precision electroweak constraints on the SU(6)/Sp(6) Little Higgs model, identifying a near-oblique limit and finding viable parameter space with top partners as light as 1 TeV and W' as light as 1.8 TeV.
Phys. Rev. D 69 (2004) 035002
Constructs a Little Higgs model with custodial SU(2) as an approximate symmetry, based on a modification of the Minimal Moose with SO(5) global symmetries. Achieves small contributions to precision electroweak observables with a breaking scale as low as 700 GeV and accessible TeV-scale partners.
unpublished
Conference contribution discussing the Little Higgs approach to the hierarchy problem.
Nucl. Phys. B Proc. Suppl. 117 (2003) 728-730
Conference proceedings summarizing the Little Higgs approach to the hierarchy problem, where the Higgs is a pseudo-Goldstone boson protected by collective symmetry breaking.
JHEP 0208:021 (2002)
Introduces the minimal theory-space construction for a Little Higgs model, where the Higgs is a pseudo-Goldstone boson protected from quadratic divergences by collective symmetry breaking. Predicts new TeV-scale partners for the top quark, gauge bosons, and scalars, with the entire Higgs potential generated by the top Yukawa coupling.
JHEP 0208:020 (2002)
Works out the collider phenomenology and dark matter implications of the Little Higgs mechanism, predicting light Higgs doublets accompanied by new weak triplet and singlet scalars, heavy TeV-scale particles with distinctive decay signatures, and a new WIMP dark matter candidate from a discrete geometric symmetry.
N-flation, metastable SUSY breaking, anyons, exotic Higgs decays: work that crosses program boundaries.
unpublished
Proposes a new theoretical framework for anyonic particles, exploring their properties and potential physical realizations.
Phys. Rev. D 75:085006 (2007)
Shows that in a class of supersymmetric models with metastable vacua, the transition to a lower-energy state does not occur even for arbitrarily high reheating temperatures, contrary to naive expectations about thermal transitions between vacua.
JCAP 0808:003 (2008)
Shows that many axion fields in string compactifications can collectively drive chaotic inflation, with each field traversing a sub-Planckian distance while their combined effect produces the large-field behavior required by observations. A radiatively stable realization of inflation from string theory's natural particle content.
unpublished
Extends the deconstruction program to six-dimensional gauge theories using two-dimensional moose lattices, studying the strongly coupled dynamics and their relation to continuum 6D theories.
JHEP 0208:019 (2002)
Shows that the fundamental group of theory space determines all relevant classical physics in the low-energy theory of Little Higgs models, providing a systematic method for constructing theory spaces with any desired particle content and potential.
JHEP 0203:055 (2002)
Provides an explicit formulation of supersymmetric Yang-Mills theories from 5 to 10 dimensions in familiar 4D N=1 superspace, enabling systematic model building with extra dimensions, orbifold constructions, brane-localized interactions, and anomaly inflow.
Identifying boosted heavy particles from their internal jet structure: the BOOST workshop series, new observables like dipolarity, and data-driven background methods.
Eur. Phys. J. C 75 (2015) 409
Report from the BOOST 2013 workshop studying relationships between jet substructure observables, their complementarity, and their dependence on underlying jet properties for quark/gluon discrimination, boosted W tagging, and boosted top tagging.
JHEP 11 (2014) 021
Studies stop pair production at a 100 TeV collider, introducing a muon-in-jet top-tagging strategy for the highly boosted regime and projecting discovery reach up to 6.5 TeV stop masses with 3000 fb^-1.
JHEP 05 (2014) 005
Develops a data-driven method for estimating QCD backgrounds in boosted-object searches by constructing templates from the substructure properties of jets in control regions.
Eur. Phys. J. C 74 (2014) 2792
Community report from the BOOST 2012 workshop summarizing the state of the art in jet substructure theory, tools, and experimental systematics for boosted-object identification at the LHC.
JHEP 08 (2013) 136
Introduces a subjet-counting search technique for high-multiplicity BSM signals at the LHC, using jet substructure to count subjets within large-radius jets and demonstrating improved sensitivity across eight benchmark signals with reduced reliance on missing energy.
J. Phys. G 39 (2012) 063001
Second annual BOOST workshop report, updating substructure benchmarks with new tools and the first Tevatron and LHC experimental results, and publishing harmonized software implementations of top-tagging algorithms.
JHEP 04 (2012) 007
Introduces dipolarity, a jet observable that distinguishes whether a pair of subjets originates from a color-singlet source by measuring the pattern of radiation between them. Incorporated into the HEPTopTagger, it improves top-vs-QCD discrimination.
Eur. Phys. J. C 71 (2011) 1661
Report of the hadronic working group of the BOOST 2010 workshop, reviewing boosted-particle reconstruction techniques and presenting the first systematic benchmark comparisons of jet grooming and top tagging algorithms.
Hands-on detector work, computational materials science, and precision measurements.
Phys. Lett. B 690 (2010) 38-41
Proposes using atom interferometry to search for new forces beyond gravity and electromagnetism, showing that existing and near-future experiments can probe theoretically motivated parameter space.
Nucl. Instrum. Meth. A 526 (2004) 249-299
Describes the design, construction, front-end electronics, high-voltage system, and drift properties of the Central Outer Tracker, the cylindrical drift chamber that provided charged-particle tracking for the CDF II detector at the Fermilab Tevatron during Run 2.
Nature 392 (1998) 582-585
Uses a genetic algorithm combined with ion mobility measurements to determine the structures of medium-sized silicon clusters (Si_n), finding that clusters with n=12-18 are built from stacked tricapped trigonal prisms while n>=19 form near-spherical cages — structures that do not correspond to bulk silicon fragments.
Split supersymmetry, the Higgs mass, long-lived gluinos, D-terms, and cosmological constraints on the SUSY breaking scale.
unpublished
Shows that early LHC evidence for a Higgs boson at 142-147 GeV points to PeV-scale split supersymmetry, with moderate-lifetime gluinos (25 microns to 10 years decay length) and an almost purely bino LSP at 70 GeV as discovery signatures.
Phys. Rev. D 76 (2007) 055007
Shows that long-lived gluinos in split supersymmetry form R-hadrons that stop in detector material, with 10^6 stopping per year in LHC detectors for a 300 GeV gluino. The subsequent delayed decays produce distinctive calorimeter deposits with no tracker or muon chamber activity.
Phys. Rev. D 72 (2005) 075011
Derives an upper limit on scalar superpartner masses in split supersymmetry from big bang nucleosynthesis constraints on long-lived gluinos. A TeV-mass gluino must decay within 100 seconds, setting the SUSY breaking scale below 10^9 GeV.
JHEP 0606:034 (2006)
Shows that gauge extensions of the MSSM with non-decoupling D-terms can raise the Higgs boson mass while maintaining gauge coupling unification, with unification constraining the Higgs mass to below roughly 150 GeV and predicting new heavy gauge bosons at a few TeV.
Phys. Rev. D 70:117703 (2004)
Computes one-loop predictions for split supersymmetry, finding the Higgs mass in the range 130-170 GeV for scalar masses above 10^6 GeV, and showing that 1% measurements of gaugino couplings could determine the SUSY breaking scale to within an order of magnitude.
Applied machine learning for on-device natural language understanding.
Apple Machine Learning Research (2023)
Describes the design of a natural language understanding system that runs on-device for personal digital assistants, achieving improvements in privacy, reliability, speed, expressiveness, and accuracy compared to server-based approaches. Shares practical insights on architectural decisions and deployment challenges.