Joint Theory Seminar
Speaker: Patrick Draper (U Chicago)
Host: Spencer Chang
Room: 432
Title: 1-loop Renormalization Group Invariants in the MSSM
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High-Energy Seminars
Time:
9:10am - 10:10am
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Description:
HE Seminar
Speaker:
Title:
Host:
Room: 416
Abstract:
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High-Energy Seminars
Time:
5:30am - 7:00am
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Description:
Joint Theory Seminar
Speaker: David Curtin
Title: Singlet-Stabilized Minimal Gauge Mediation
Host: Markus Luty
Room: 432
Abstract: We propose Singlet Stabilized Minimal Gauge Mediation as a simple ISS-based model of Direct Gauge Mediation which avoids both light gauginos and Landau Poles. The hidden sector has trivial magnetic gauge group and minimal unbroken SU(5) flavor group, while the uplifted vacuum is stabilized by an additional singlet sector with its own U(1) gauge symmetry, This generates a nonzero VEV for the singlet meson via the inverted hierarchy mechanism but requires tuning to a precision 0.1%, a common problem with quantum-stabilized models which might conceivably be explained by a UV-completion of the theory. In the course of this analysis we also outline some simple model-building rules for stabilizing uplifted ISS models, which lead us to conclude that meson deformations are required (or at least heavily favored) to stabilize the adjoint component of the magnetic meson.
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High-Energy Seminars
Time:
8:10am - 9:10am
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HE Seminar
Speaker: Alex Dahlen (Princeton)
Title: The Fastest Decay in the Landscape
Host: Nemanja
Room: 416
Abstract:Theories with extra dimensions naturally give rise to a large landscape of vacua stabilized by flux. I will show that the fastest decay is a giant leap to a wildly distant minimum, in which many different fluxes discharge at once. Indeed, the fastest decay is frequently the giantest leap of all, which discharges all the flux and begets a bubble of nothing. Finally, I will discuss how these giant leaps are mediated by the nucleation of "monkey branes" which wrap the extra dimensions.
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High-Energy Seminars
Time:
5:30am - 7:00am
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Description:
Joint Theory Seminar
Speaker: Felix Yu (UC Irvine)
Title: A New Method for Resolving Combinatorial Ambiguities at Hadron Colliders
Host: Hsin-Chia Cheng
Room: 432
Abstract: We present 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. Our method, based on selection cuts favoring high transverse momentum and low invariant mass pairings, is shown to be significantly superior to the more traditional hemisphere method for a large class of decay chains, producing an increase in signal retention of up to a factor of 2. This new method can thus greatly reduce the combinatorial ambiguities of decay chain assignments.
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High-Energy Seminars
Time:
8:10am - 9:10am
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Description:
HE Seminar
Speaker: Eric Prebys, Fermilab.
Title: The Mu2E Experiment
Host: Mani Tripathi
Room: 416
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High-Energy Seminars
Time:
8:10am - 9:00am
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Description:
Speaker: Maury Goodman (ANL)
Title: Results from MINOS and plans for NOvA
Host: Bob Svoboda
Room: 432
Abstract: MINOS is a long-baseline neutrino oscillation experiment using the NuMI beam at Fermilab and a far detector at the Soudan mine in Minnesota. Results include measurement of parameters for muon to tau neutrino oscillations, a search for muon to electron neutrino oscillations, a search for sterile neutrinos, and a comparison of oscillations with neutrinos and antineutrinos. NOvA is a new off-axis detector being built along the same beamline up in Minnesota, but on the surface. There are also new near detectors being built at Fermilab. The design, capabilities and schedule will be presented.
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High-Energy Seminars
Time:
5:30am - 7:00am
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Yes - 1 day 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker: Dam Thanh Son (Univ of Washington)
Title: Axial anomalies in hydrodynamics
Host: Hsin-Chia Cheng
Room: 432
Abstract: We consider the hydrodynamic regime of theories with quantum anomalies for global currents. We show 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. This term leads to a number of new effects, one of which is chiral separation in a rotating fluid at nonzero chemical potential. The new kinetic coefficients can be expressed, in a unique fashion, through the anomalies coefficients and the equation of state. We briefly discuss the relevance of this new hydrodynamic term for physical situations, including heavy ion collisions.
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High-Energy Seminars
Time:
8:10am - 9:10am
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Description:
HE Seminar
Speaker: Tomer Volansky (UC Berkeley)
Title: Higgs Decaying to Lepton Jets
Host: Spencer Chang
Room: 416
Abstract: The Higgs and some of the Standard Model superpartners may have been copiously produced at LEP and the Tevatron without being detected. We study a novel scenario of this type in which the Higgs decays predominantly into a light hidden sector either directly or through light SUSY states. Subsequent cascades increase the multiplicity of hidden sector particles which, after decaying back into the Standard Model, appear in the detector as clusters of collimated leptons known as lepton jets. We identify the relevant collider observables that characterize this scenario, and study a wide range of LEP and Tevatron searches to recover the viable regions in the space of observables. We find that the Higgs decaying to lepton jets can be hidden when the event topology mimics that of hadronic backgrounds. Thus, as many as 10^4 leptonic Higgs and SUSY decays may be hiding in the LEP and Tevatron data. We present benchmark models with a 100 GeV Higgs that are consistent with all available collider constraints. We end with a short discussion of strategies for dedicated searches at LEP, the Tevatron and the LHC, that allow for a discovery of the Higgs or SUSY particles decaying to lepton jets.
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High-Energy Seminars
Time:
5:30am - 7:00am
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Description:
Joint Theory Seminar
Speaker: Prateek Agrawal
Title: Detecting and discriminating WIMP Dark Matter: A
model-independent approach
Host: Markus Luty
Abstract: I will discuss how we can use results from dark matter
experiments to draw model-independent conclusions about the nature of
WIMP dark matter. Specifically, I show that combining the results of
direct detection experiments with data from neutrino telescopes can
help establish whether the dark matter particle is its own
anti-particle. Further, I will discuss model-independent features of
the photon continuum and line spectra arising from dark matter
annihilation, and show how these may be used to obtain general
constraints on theories of dark matter.
User:
High-Energy Seminars
Time:
8:10am - 9:10am
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Yes - 1 day 8 hour 0 minutes before start
Description:
HE Seminar
Speaker: Nathaniel Craig
Title: Dynamical Supersymmetry Breaking and the Origins of Flavor
Host: Markus Luty
Room: 416
Abstract:
We explore calculable modes with low-energy supersymmetry in which the Standard Model flavor hierarchy is generated by quark and lepton compositeness, and where the composites emerge from the same dynamics that spontaneously breaks supersymmetry. These single-sector models -- which in many cases remain perturbative up to the GUT scale -- reproduce the fermion flavor hierarchy, align supersymmetric and Standard Model flavor, and may dynamically explain the Standard Model chiral index.
6:30am» Joint Theory Seminar: Patrick Draper