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Particle Physics

This series consists of talks in the areas of Particle Physics, High Energy Physics & Quantum Field Theory.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.


Tuesday Feb 19, 2013

interpretation of events with jets is often ambiguous, especially for the sort
of highly complex events one encounters at the LHC.  One often finds that
an event interpreted as signal-like using one choice of jet algorithm and
radius parameter is no longer signal-like with another, even if the two are
very similar.  Here we present an extension of the Qjets procedure
designed to account for this ambiguity and assign each plausible interpretation
of an event a weight, so that events which are unambiguously signal-like carry

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Friday Jan 18, 2013

There is overwhelming evidence that non-baryonic dark
matter constitutes ~23% of the energy density of the universe.  Weakly Interacting Massive Particles (WIMPs)
are promising dark matter candidates that may produce gamma rays via
annihilation or decay detectable by the Fermi Large Area Telescope (Fermi
LAT).  A detection of WIMPs would also
indicate the existence of physics beyond the Standard Model.  I will present recent results from indirect
WIMP searches by the Fermi LAT Collaboration. 

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Tuesday Jan 15, 2013
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Tuesday Dec 18, 2012

We study the implications at the LHC for a recent class
of non-custodial warped extra-dimensional models where the AdS_5 metric is
modified near the infrared brane. Such models allow for TeV Kaluza-Klein
excitations without conflict with electroweak precision tests. We discuss both
the production of electroweak and strong Kaluza-Klein gauge bosons. As we will
show, only signals involving the third generation of quarks seem to be feasible
in order to probe this scenario.

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Friday Dec 14, 2012

In this talk, I'll give a brief summary of how one-loop
bulk effects
renormalize both bulk and brane effective interactions for geometries sourced by codimension-two
branes. I'll then discuss what these results imply for a six-dimensional
supergravity model which aims to capture the features that make extra-dimensional
physics attractive for understanding naturalness issues in particle physics.
I'll also emphasize the role that brane back-reaction plays in yielding

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Friday Dec 07, 2012

We analyze the
implications for Susy theories of a Higgs to di-photon rate enhanced, if
compared to the Standard Model prediction. We show how models predicting a
sizable enhancement have generically an electroweak vacuum that is not
absolutely stable. In particular we discuss the only viable scenario that can
predict sizable new physics effects in the di-photon rate in the framework of
the MSSM: a scenario with light and heavily mixed staus. We conclude with the

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Tuesday Dec 04, 2012

The LHC has made
remarkable progress in exploring the SM at new energies and demonstrating
remarkable agreement with theoretical predictions.  In this talk I will
discuss one area where the SM does not fit as well as expected, and what could
be hints of new physics showing up in the electroweak sector.

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Tuesday Nov 27, 2012
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Tuesday Nov 13, 2012

Light third generation
superpartners are one way to avoid  bounds on new physics from the early
LHC. We will review the theory and phenomenology of light stops and highlight a
particular UV model based a partially composite electroweak sector through
Seiberg duality. 

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Tuesday Oct 23, 2012

We present new results on the performance of jet substructure techniques
and their use in distinguishing the signatures of new boosted massive particles
from the QCD background. Advanced approaches to jet reconstruction using jet
grooming algorithms such as filtering, trimming, and pruning are compared.
Measurements of the jet invariant mass for each jet algorithm are compared both
at the particle level to multiple Monte Carlo event generators and at the
detector level for several configurations of the jet grooming algorithms.

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