UC Davis Particle Physics Seminars: Recent Episodes
John Terning
This album features seminars on theoretical and experimental particle physics. Topics include supersymmetry, the Large Hadron Collider, electroweak symmetry breaking, cosmology and gravity.
Events with three or more prompt leptons are rare at hadron colliders. At the LHC, where high interaction energies and rates create extremely busy final states, such multilepton events are well suited as a probe for new physics beyond the Standard Model (BSM). Mike Hance describes some recent analyses from ATLAS based on multilepton signatures. In particular, focusing on new model-independent limits for anomalous production of multilepton events that can be used to test a variety of BSM scenarios.
The July 4th announcement of the discovery of a Higgs-like particle at CERN LHC is only the beginning of a challenging program of "Higgs Identification" to establish the quantum numbers and couplings of the new particle, and to reveal its relationship, if any, to electroweak symmetry-breaking and fermion mass generation. Ian Low discusses preliminary efforts in this direction and explore implications of current measurements on future searches at the LHC and beyond.
Jet substructure is typically studied using clustering algorithms, such as kT, which arrange the jets' constituents into trees. Instead of considering a single tree per jet, Tuhin Roy proposes that multiple trees should be considered, weighted by an appropriate metric. Then each jet in each event produces a distribution for an observable, rather than a single value. Advantages of this approach include: 1) observables have significantly increased statistical stability; and, 2) new observables, such as the variance of the distribution, provide new handles for signal and background discrimination. For example, we find that employing a set of trees substantially reduces the observed fluctuations in the pruned mass distribution, enhancing the likelihood of new particle discovery for a given integrated luminosity. Furthermore, we introduce a new quantity 'volatility', a cut on which reduces the luminosity needed for a given significance requirement by a factor of two.
Nonlinear realizations describe the low-energy degrees of freedom of strongly coupled theories with spontaneously broken symmetry. When combined with SUSY, the Goldstone bosons of these theories are complex fields with "Goldstone fermion" super-partners. These, in turn, offer novel weakly interacting massive particle (WIMP) dark matter candidates. Flip Tanedo discusses how these can be used in realistic models of dark matter.
Guido D'Amico describes a new model of inflation using branes unwrapping from extra dimensions.
Weak scale SUSY with R-symmetry is a plausible solution to the SUSY flavor problem. In this talk, Yuhsin Tsai discusses two interesting aspects of R-symmetric SUSY models: electroweak baryogenesis and superpartner oscillations. Regarding baryogenesis, the new superpotential couplings between the adjoints and the Higgs can increase the strength of the electroweak phase transition, and large CP-violating phases consistent with electric dipole moments can generate large baryon asymmetry. R-symmetric models can also give spectacular signals at the LHC. If a tiny Majorana mass splits the degenerate mass eigenstates of gauginos and higgsinos, states produced at the LHC can oscillate between the spraticles and their Dirac mass partners. With displaced decays, the oscillation can be visible in the distribution of displaced vertex lengths at the LHC.
Jason Gallicchio explains how distinguishing light-quark jets from gluon jets on an event-by-event basis could significantly enhance the reach for many new physics searches at the Large Hadron Collider. Through an exhaustive search of existing and novel jet substructure observables, we find that a combination of two simple variables, the charge track multiplicity and the p_T-weighted linear radial moment (width), can filter out over 85-95% of the gluon jets while keeping more than half of the light-quark jets. I will discuss applications, address theoretical issues in the definitions of quark and gluon jets, and show progress that ATLAS has made in measuring these observables.
Recent signs of a Standard Model-like Higgs at 125 GeV point towards large A-terms in the MSSM. This presents special challenges for gauge mediation, which by itself predicts vanishing A-terms at the messenger scale. In this paper, we review the general problems that arise when extending gauge mediation to achieve large A-terms, and the mechanisms that exist to overcome them. Using these mechanisms, we construct weakly-coupled models of low-scale gauge mediation with extended Higgs-messenger couplings that generate large A-terms at the messenger scale and viable mu/Bmu-terms. Our models are simple, economical, and complete realizations of supersymmetry at the weak scale.
The W boson mass is a crucial parameter in the standard model of particle physics, providing constraints on the mass of the Higgs boson as well as on new physics models via quantum loop corrections. Bo Jayatilaka describes the measurement of the W boson mass using data corresponding to 2.2/fb of integrated luminosity collected with the CDF II detector. The measurement, performed using electron and muon decays of W bosons, yields a mass of 80387±19 MeV. This represents the single most precise measurement of the W boson mass ever performed, significantly surpassing the precision of all prior measurements combined. An updated world average of the W boson mass, including all recent Tevatron measurements, as well as the resulting standard model implications, is presented.
Both the ATLAS and CMS detectors have operated with high efficiency in the first two years of LHC operation and produced an impressive number of physics results. In this talk I will discuss some of the differences between the detectors and describe some unique features of the ATLAS detector and how these features have been exploited in our physics analyses. I will describe some selected recent results and conclude with an overview of the planned, near term ATLAS detector upgrades.
The bulk matter Randall-Sundrum (RS) model is a setup where Standard Model (SM) matter and gauge fields reside in the bulk of 5D warped spacetime while the Higgs field is confined on the IR brane. The wavefunctions of the 1st and 2nd generation matter particles are localized towards the UV brane and those of the 3rd generation towards the IR brane, so that the hierarchical structure of the Yukawa couplings arises geometrically without hierarchy in fundamental parameters. This paper discusses an experimental test of this model in the case where the Kaluza-Klein scale is far above the collider scale, but the model is combined with 5D Minimal SUSY Standard Model (MSSM) and SUSY particles are in the reach of collider experiments. A general SUSY breaking mass spectrum consistent with the bulk matter RS model is considered: SUSY breaking sector locates on the IR brane and its effects are mediated to 5D MSSM through a hybrid of gravity mediation, gaugino mediation and gauge mediation.
I look for a golden region in the parameter space of the NMSSM with a low cut-off where a SM-like Higgs with a mass m_h ~ 125 GeV can be obtained in a minimal bottom-up approach of field content.
The experimental signature of two leptons with the same electric charge is a great way to search for new physics as the backgrounds from Standard Model processes are quite low and a large variety of new physics models can produce this signature, e.g models with extended Higgs sectors, Supersymmetry, additional quark generations, and many more. Beate Heinemann reviews the ATLAS analyses in this signature based on the 2011 LHC data.
It is widely believed that the emergent magnetic gauge symmetry of SQCD is analogous to a hidden local symmetry (HLS). James Barnard explores this idea in detail, deriving the entire (spontaneously broken) magnetic theory by applying the HLS formalism to spontaneously broken SU(N) SQCD. We deduce the Kahler potential in the HLS description, and show that gauge and flavour symmetry are smoothly restored along certain scaling directions in moduli space. We propose that it is these symmetry restoring directions, associated with the R-symmetry of the theory, that allow full Seiberg duality. Reconsidering the origin of the magnetic gauge bosons as the rho-mesons of the electric theory, colour-flavour locking allows a simple determination of the parameter "a". Its value continuously interpolates between a=2 on the baryonic branch of moduli space - corresponding to "vector meson dominance" - and a=1 on the mesonic branch.
Jamison Galloway reviews recent Higgs data from the LHC and discuss ways in which model-independent conclusions can be drawn. The bottom-up thinking that goes into this can help to determine what other new physics we might anticipate finding at accessible scales, while allowing us to assess emerging proposals for the origins of the hinted Higgs-like state at 125 GeV. Using composite Higgs and the MSSM as two case studies, Galloway discusses the benefits of constructing these generalized exclusions and describe some very general conclusions that they will help to illuminate with current and future data.
Sergey Dubovsky discusses the effective field theory of long relativistic strings such as confining flux tubes in QCD. We derive the Polchinski-Strominger interaction by a calculation in static gauge. This interaction implies that a non-critical string which initially oscillates in one direction gets excited in orthogonal directions as well. In static gauge no additional term in the effective action is needed to obtain this effect. It results from a one-loop calculation using the Nambu-Goto action. Non-linearly realized Lorentz symmetry is manifest at all stages in dimensional regularization. We also explain that independent of the number of dimensions non-covariant counterterms have to be added to the action in the commonly used zeta-function regularization.
Yuri Shirman describes a simple recipe for obtaining local supersymmetry-breaking vacua in s-confining theories coupled to gauge singlets. This recipe gives rise to effective O'Raifeartaigh models in the IR, with calculable supersymmetry-breaking minima near the origin and can be applied to both vector-like and chiral theories. Since the properties of the vacuum are largely determined by superpotential terms that are non-renormalizable in the UV, it is calculable even when all dimensionless couplings are taken to be of order one. By construction, the models preserve a large subgroup of the original global symmetry. While we only study here s-confining theories, we expect our tools to be useful for inducing dynamical supersymmetry breaking in many gauge theories.
Matt Wettstein gives a brief overview of the Large Area Picosecond Photodetector (LAPPD) project, an effort to develop compact, microchannel plate (MCP) photomultiplier tubes capable of sub-millimeter, sub nanosecond spatial resolutions and with potential for scalability to large experiments. Wettstein will also discuss steps taken towards the construction of experimental LAPPD-based neutrino detectors and the potential applications for such detector systems in answering the important questions of neutrino physics.
Henrique Gomes discusses new ways to build effective theories that are Poincare invariant but the symmetry is not manifest.
Sung Park discusses the development of Resistive Plate Chamber (RPC), multi-gap RPC and Resistive Micropattern Detectors, in particle physics.
Sho Maruyama reviews Supersymmetric particle and Standard Model Higgs boson searches in high energy physics. Maruyama continues on to describe how trigger and Data Quality Monitoring system are used at the Compact Muon Solenoid experiment at CERN. The trend in trigger menu development will be discussed in detail. One of main focuses of this talk is the work that can be done by graduate students.
John Terning discusses how a SUSY model of a composite top-Higgs sector can resolved the four hierarchy problems: the gauge hierarchy, the yukawa hierarchy, the little hierarchy, and the squark mass hierarchy.
Inspired by models designed to explain the top-quark foward-backward asymmetry, Daniel Whiteson discusses studies of unexplored experimental signatures inside WWbb+jet events, which mimic the top quark signature and may be hiding inside the top quark sample. Whiteson presents the first search for top+jet resonances, the first search to use boosted hadronic W bosons, new same-sign top quark limits, new heavy quark limits, and discuss ttbar+jet resonances, as well as the possibility that Higgs cascades could be hiding inside WWbb events.
Katherine Copic discusses ATLAS's first searches for fourth generation quarks, including a preview of new results for the winter conferences. While we search explicitly for fourth generation quarks, the final states examined are also more broadly applicable to searching for wider classes of new phenomenona.
Jared Kaplan discusses muon colliders and neutrino factories. They are aimed at achieving the highest lepton-antilepton collision energies and precision measurements of parameters of the neutrino mixing matrix. The performance and cost of these depend sensitively on how well a beam of muons can be cooled. Recent progress in muon cooling design studies and prototype tests nourish the hope that such facilities can be built during the next decade. The status of the key technologies and their various demonstration experiments will be summarized.
Jared Kaplan discusses how to derive a simple relation between the Mellin amplitude for AdS/CFT correlation functions and the bulk S-Matrix in the flat spacetime limit, proving a conjecture of Penedones. As a consequence of the Operator Product Expansion, the Mellin amplitude for any unitary CFT must be a meromorphic function with simple poles on the real axis. This provides a powerful and suggestive handle on the locality vis-a-vis analyticity properties of the S-Matrix. We begin to explore analyticity by showing how the familiar poles and branch cuts of scattering amplitudes arise from the holographic description. We use this to show how the existence of small black holes in AdS leads to a universal prediction for the conformal block decomposition of the dual CFT.
Jean-Francois Arguin discusses how ecent measurements of the top quark charge asymmetry performed at both CDF and DZero produced tantalizing deviations from the SM prediction. Given that the dataset for these analyses will not improved dramatically, decisive confirmations will be required by the LHC experiments. After reviewing the measurements performed at the Tevatron, Arguin will discuss the challenges to perform these measurements at the LHC by describing the ATLAS measurement. In particular Arguin will describe how one needs to exploit the large datasets of top quarks at the LHC to compensate for the difficulty to perform such a measurement in a symmetric proton-proton collider environment.
Csaba Csaki discusses how minimal flavor violation in supersymmetry can give a consistent phenomenology with resorting to R-party.
A generic prediction of string theory is the existence of many axion fields. It has recently been argued that many of these fields should be light and, like the well known QCD axion, lead to observable cosmological consequences. In this video, Marsh talks about in detail the effect of the so-called string axiverse on large scale structure, focusing on the morphology and evolution of density perturbations, anisotropies in the cosmic microwave background and weak gravitational lensing of distant galaxies.
Eric Zimmerman offers the experimental results from the T2K experiment on neutrino mixing.
Dmitry Bandurin talks about the D0 measurement of a sample of photon+3jet events used to determine the fraction of events with double parton (DP) scattering at sqrt{s}=1.96 TeV.
Matt Reece talks about near degeneracy of superpartners enforced by the couplings of a new sector to supersymmetry breaking.
This video offers an alternative scheme to allow R-parity violation with phenomenological disasters.
Ben Heidenreich discusses constraining R-parity violation with minimal flavor violation.
David Shih discusses the phenomenology of the stop squark as the the next to lightest superpartner.
Gordon Watts gives the status and prospects for supersymmetry searches with the ATLAS detector.
How the absence of supersymmetric signatures at the LHC do not yet conflict with naturalness.
Fortin investigates the theoretical implications of scale without conformal invariance in quantum field theory, arguing that the RG flows of such theories correspond to recurrent behaviors, i.e. limit cycles or ergodicity. He also discusses the implications for the a-theorem and show how dilatation generators do generate dilatations. Finally, Fortin discusses well-behaved non-conformal scale-invariant examples.
Many models for Supersymmetry (SUSY) predict strong coupling to third-generation Standard Model particles. As part of a broad program of complementary searches for SUSY, CMS has two recent analyses requiring b-jets in the final state. I will present these latest results, each performed with 1.1 fb^-1 of data.
David Sanford discusses the direct detection of dark matter through its elastic scattering off nucleons as among the most promising methods for establishing the particle identity of dark matter.
Rob Forrest describes recent SUSY searches at CDF, emphasizing direct searches for weakly produced Charginos and Neutralinos including many recent results using the dilepton and trilepton signatures. The results represent the final and most stringent limits placed on Chargino and Neutralino mass from CDF through the end of the life of the Tevatron.
Jason Evans discuss the implications of the excesses in LHC Higgs boson searches on the gauge mediated supersymmetric standard model, for the mass range 120-140 GeV. A relatively heavy lightest Higgs boson mass in this range can be reconciled with light SUSY particles, if there are additional fields which couple directly to the Higgs boson. The mass of this extra matter can be predicted rather precisely in gauge mediation for a given Higgs boson and gluino mass.
Yang Bai argues that dark matter particles that have strong interactions with the Standard Model particles are not excluded by current astrophysical constraints. These dark matter particles have unique signatures at colliders; instead of missing energy, the dark matter particles produce jets. We propose a new search strategy for such strongly interacting particles by looking for a signal of two trackless jets. We show that suitable cuts can plausibly allow us to find these signals at the LHC even in early data.
The AdS/CFT correspondence relates bulk Einstein geometries to boundary conformal geometry. We show that bulk geometry can also be described in terms of conformal geometry. This description yields a solution generating algebra in the bulk that controls solutions to very general bulk boundary problems. Using this algebra we present a boundary conformal calculus for conformally compact manifolds.
Jason Gallicchio discusses a new class of observables that aims to characterize the superstructure of an event, that is, features such as color flow, which are not determined by the jet four-momenta alone.
Jiji Fan discusses a broad class of supersymmetric models that preserve R-parity but lack missing energy signatures. These models have new light particles with weak-scale supersymmetric masses that feel SUSY breaking only through couplings to the MSSM. This small SUSY breaking leads to nearly degenerate fermion/boson pairs, with small mass splittings and hence small phase space for decays carrying away invisible energy. The simplest scenario has low-scale SUSY breaking, with missing energy only from soft gravitinos.
An emergent or accidental supersymmetry is used to address the little hierarchy problem in Randall-Sundrum models by naturally generating a hierarchy between the IR scale and the electroweak scale. Supersymmetry is broken on the UV brane which triggers the stabilization of the warped extra dimension at an IR scale of order 10 TeV. This causes the first two sparticle generations to decouple, thereby avoiding the supersymmetric flavour and CP problems, while an accidental R-symmetry protects the gaugino mass. The resulting low-energy sparticle spectrum consists of stops, gauginos and Higgsinos which are sufficient to stabilize the little hierarchy between the IR scale and the electroweak scale. Introducing a singlet Higgs field on the IR brane, ameliorates the supersymmetric little hierarchy problem, and allows Higgs masses up to 300 GeV.
We present a study of the invariant mass distribution of jet pairs produced in association with a W boson using data collected with the CDF detector which correspond to an integrated luminosity of 4.3 fb^-1. The observed distribution has an excess in the 120-160 GeV mass range which is not described by current theoretical predictions within the statistical and systematic uncertainties. In particular we will discuss the properties and the significance of this excess.
In the causal set approach to quantum gravity the spacetime continuum arises as an approximation to a fundamentally discrete substructure, the causal set, which is a locally finite partially ordered set. The causal set paradigm was elucidated in a classic paper by Bombelli, Lee, Meyer and Sorkin in 1987. While early kinematical results already showed promise, the program received a substantial impetus about a decade ago with the work of Rideout and Sorkin on a classical stochastic growth dynamics for causal sets. Considerable progress has been made ever since in our understanding of causal set theory while leaving undisturbed the basic paradigm. Recent highlights include a causal set expression for the Einstein-Hilbert action and the construction of a scalar field Feynman propagator on a fixed causal set.
Joe Polchinski discusses the idea that physics must be holographic and that the fundamental variables are nonlocal and locality is emergent; this is a complete change from previous experience, and we have much to understand.
Sachindeo Vaidya argues that an accelerating frame may be defined (i.e. as a sequence of instantaneous Lorentz transformations) in noncommutative Moyal spacetime.
Hal Haggard presents on computing the Bohr-Sommerfeld volume spectrum of a tetrahedron and showing that it reproduces the quantization of a grain of space found in loop gravity.
Yasunori Nomura presents a framework in which well-defined predictions are obtained in an eternally inflating multiverse, based on the principles of quantum mechanics.
Guido D'Amico presents the consequences of imposing an approximate Galilean symmetry on the Effective Theory of Inflation, the theory of small perturbations around the inflationary background.
Zacharia Chacko discusses the spectrum of gamma ray signals that arise from dark matter annihilation in the universe.
Vikram Rentala proposes a new model-independent method for spin measurements which takes advantage of quantum interference among helicity states.
Erich Poppitz discusses the Eguchi-Kawai reduction in the strong-coupling domain of gauge theories via the gravity dual of N=4 super-Yang-Mills on R^3xS^1.
Albert De Roeck gives an overview of results from the CMS detector using data from the first year of running the Large Hadron Collider.
Keith Rehermann proposes that dark matter is dominantly comprised of atomic bound states.
Jesse Thaler describes a new jet shape, N-subjettiness, designed to tag boosted hadronically-decaying objects and reject the background of QCD jets with large invariant mass.
David Poland derives general bounds on operator dimensions, central charges, and OPE coefficients in 4D conformal and N=1 superconformal field theories.
Josh Ruderman talks about Tevatron limits and LHC discovery potential for a wide class of GMSB scenarios in which the next-to-lightest superpartner (NLSP) is a promptly-decaying neutralino.
Jared Kaplan examines the implications of the recent CDF measurement of the top-quark forward-backward asymmetry, focusing on a scenario with a new color octet vector boson at 1-3 TeV.
Liam Fitzpatrick develops the idea of an effective conformal theory describing the low-lying spectrum of the dilatation operator in a CFT.
Mike Dine talks about generalizing gaugino condensation and constructing large classes of models which are classically scale invariant and which spontaneously break discrete R symmetries (but not supersymmetry).
Ryuichiro Kitano considers a supersymmetric QCD with soft supersymmetry breaking terms as the dynamics for the electroweak symmetry breaking.
Howie Haber discusses that by examining the monojet signature at a high luminosity LHC, we can estimate the precision with which supersymmetric coupling relations can be experimentally established.
Nima Arkani-Hamed presents a new approach to quantum field theory that relies on dualities to avoid Feynman graphs.
Nima Arkani-Hamed discusses how fundamental physics started the 20th century with the twin revolutions of relativity and quantum mechanics, and much of the second half of the century was devoted to the construction of a theoretical structure unifying these radical ideas, which has been confirmed to exquisite precision by experiments over the past three decades.
Matt Reece discusses some distinctive phenomenology associated with low-scale breaking of supersymmetry (as in models of gauge mediation).
Graham Kribs talks about what can be extracted from (a single observation of) nuclear recoil events at a direct detection experiment completely independent of astrophysics.
Csaba Csaki reviews magnetic monopoles and describes a model where monopole bilinears condense and break electroweak symmetry.
Tony Padilla talks about problems with Lorentz Invariance violating theories of gravity.
Nathaniel Craig explores calculable models with low-energy supersymmetry where the flavor hierarchy is generated by quark and lepton compositeness, and where the composites emerge from the same sector that dynamically breaks supersymmetry.
Prateek Agrawal presents renormalizable theories where the scattering of dark matter is elastic and arises at tree-level.
Tomer Volansky presents a novel scenario in which the Higgs decays predominantly into a light hidden sector either directly or through light SUSY states.
Dam Son shows that a hitherto discarded term in the conserve current is not only allowed by symmetries, but is in fact required by triangle anomalies and the second law of thermodynamics.
Jeremy Mardon shows that the BBN bound can be naturally evaded in the presence of multiple sectors which independently break supersymmetry, since there is a new decay channel of the LOSP to a goldstino.
Felix Yu presents a new method for resolving combinatorial ambiguities that arise in multi-particle decay chains at hadron colliders where the assignment of visible particles to the different decay chains has ambiguities.
Alex Dahlen shows that the fastest decay is a giant leap to a wildly distant minimum, in which many different fluxes discharge at once.
David Curtin proposes Singlet Stabilized Minimal Gauge Mediation as a simple ISS-based model of Direct Gauge Mediation which avoids both light gauginos and Landau Poles.
Patrick Draper gives a talk about how if collider experiments demonstrate that the Minimal Supersymmetric Standard Model (MSSM) is a good description of nature at the weak scale, the experimental priority will be the precise determination of superpartner masses.
Christoph Englert discusses how the upcoming generation of colliders' weak boson production in association with hard jets is going to provide insight into the mechanism of electroweak symmetry breaking.
Tim Cohen discusses how Asymmetric Dark Matter (ADM) models relate the dark matter density to the baryon asymmetry, so that a natural mass scale for ADM is around a few GeV.
Jared Evans constructs a complete, realistic, and natural UV completion of minimal conformal technicolor that explains the origin of quark and lepton masses and mixing angles.
Wonsang Cho reports on a new possibility of using the $\mct2$ (Constransverse mass) variable for mass measurement of single step decay chains involving missing particles with moderate transverse momentum.
Luca Vecchi proposes an asymptotically non-free, natural model for dynamical electro-weak symmetry breaking characterized by the emergence of a weakly coupled Higgs in the IR regime.
Matt Reece investigates stringy excitations in Randall-Sundrum effective theories for electroweak symmetry breaking.
Chris Lee talks about how by using the framework of Soft-Collinear Effective Theory, it proves a factorization theorem for jet shape distributions.
Marianglea Lisanti discusses how predictions for direct detection experiments depend on uncertainties in quenching factor measurements, the dark matter interaction with the Standard Model and the halo velocity distribution.
Takemichi Okui presents a complete, viable model of gravity-mediated supersymmetry breaking that is safe from all flavor constraints.
Andrei Gritsan presents on the production and decay of a new single resonance at the LHC, with examples ranging from the Standard Model Higgs boson to KK Graviton in the models with extra space dimensions.
Ian-Woo Kim proposes a novel generalized method for mass measurements based on phase space singularity structures that can be applied to any event topology with missing energy.
Peter Graham presents on the possibility that the observable universe originated in a transition from a vacua with lower dimensionality than ours.
Matt Szydagis talks about how the old technology of bubble chambers can be updated for detecting dark matter.
Philip Schuster identifies the production and decay properties of new light gauge bosons that dictate fixed-target search strategies.
Yasunori Nomura talks about how if supersymmetry is broken directly to the Standard Model at energies not very far from the unified scale, the Higgs boson mass lies in the range 128-141 GeV.
Daniel Stolarski discusses that while little Higgs models provide an interesting way to address the hierarchy problem, concrete models in the literature typically face two major obstacles.
Motivated by the recent observation of the high energy electron and positron excesses in cosmic ray by PAMELA and ATIC/PPB-BETS, Jing Shu suggests an anomaly-free scenario for the universal extra dimension that localizes the SM quarks and splits the spectrum of KK quarks from KK leptons.
Tommy Levi analyzes the cosmological signatures visible to an observer in a Coleman-de Luccia bubble when another such bubble collides with it.
Matt Buckley discusses using jet measurements at the Large Hadron Collider to determine the spin of new particles.
Kaustubh Agashe talks about extra dimensional theories where an unusual type of dark matter is predicted from the requirement of proton stability.
Clifford Cheung examines theories where there are several approximate Goldstone fermions that have experimental signatures.
Lisa Goodenough discusses the possibility of indirect detection of dark matter from the Pamela and Fermi experiments.
Bogdan Dobrescu talks about how the parameter space of the Minimal Supersymmetric Standard Model includes a region where the down-type fermion masses are generated by the loop-induced couplings to the up-type Higgs doublet.
Arjun Menon discusses constraints on the inelastic dark matter scenario that may explain the DAMA result.
Jack Gunion talks about exploring the possibility of a Higgs below the LEP limit via non-standard decays.
Manuel Toharia discusses the context of a warped extra-dimension with Standard Model fields in the bulk, where we obtain the general flavor structure of the couplings to fermions of both the Higgs scalar and the radion graviscalar.
Spencer Chang discusses a model of asymmetric dark matter with displaced vertex signatures.
Jay Wacker talks about this model of dark matter where it is composed of bound states with very small level splitting that make it compatible with the DAMA experiment.
Ido Ben-Dayan talks about novel inflationary models that predict observable gravitational waves.
Csaba Csaki shares a model where alternative Higgs decays allow the Higgs to be light enough to solve the little hierarchy problem but consequently be very difficult to find at the Large Hadron Collider.
Sergei Dubovsky gives a proposal on searching for light axions using super-radiant modes of black holes.
Mina Arvanitaki talks about signatures of multiple axions over a wide range of mass scales.
Zhenyu Han discusses techniques for reconstructing particle spin in missing energy events at the Large Hadron Collider.
Brock Tweedie discusses methods for finding the neutrinos superpartner at the Large Hadron Collider when it is the lightest or next to lightest superpartner.
Anupama Atre talks about new quarks in a single top channel at the Top @ Tevatron 4 LHC workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
K.C. Kong talks about T' Theories at the the Top @ Tevatron 4 LHC workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Gustavo Burdman gives a talk at the the Top @ Tevatron 4 LHC workshop on T' Theories: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Robin Erbacher talks at the the Top @ Tevatron 4 LHC workshop about heavy top at the tevatron: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Doug Glenzinski talks at the Top @ Tevatron 4 LHC workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Jorgen d'Hondt gives a talk at the the Top @ Tevatron 4 LHC workshop on new physics at the LHC: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Michael Peskin talks about top quark spin and resonances at the Top @ Tevatron 4 LHC workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Dan Amidei gives a talk at the Top @ Tevatron 4 LHC workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Sal Rappoccio gives a talk at the the Top @ Tevatron 4 LHC workshop on boosted tops: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Wai Yee Keung gives a talk at the the Top @ Tevatron 4 LHC workshop on Top A_fb Theory: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:topattevatron.
Michael Graesser presents a simple formulation of non-linear supersymmetry where superfields and partnerless fields can coexist.
Lingchuan Li discusses the creation of the baryon anti-baryon asymmetry at the electroweak phase transition in supersymmetric models as well as the relation to measurable electric dipole moments.
Jesse Thaler gives a proposal for a low energy, high intensity experiment for testing Dark Force models.
Michael Spannowsky talks about jet cleaning techniques for identifying new physics signals at the Large Hadron Collider.
Takemichi Okui reports on the several classes of theories beyond the Standard Model that contain massive spin-1 color octets, generically called "colorons." He argues that colorons inevitably appear in the spectrum whenever new colored particles feel an additional confining force.
This talk was given by Marco Peloso at the Particle Cosmology Frontier Workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:particlecosmo
Alex Westphal talks about monodromy inflation at the Particle Cosmology Frontier Workshop: http://particle.physics.ucdavis.edu/workshops/doku.php?id=2009:particlecosmo
Lloyd Knox talks about the launch of the Planck satellite and its expected impact on cosmology.