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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.

 

Mardi déc 18, 2012
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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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Vendredi déc 14, 2012
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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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Vendredi déc 07, 2012
Speaker(s): 

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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Mardi déc 04, 2012
Speaker(s): 

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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Mardi nov 27, 2012
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Mardi nov 13, 2012
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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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Mardi 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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Mardi oct 16, 2012
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With the discovery of a new Higgs-like particle at the LHC, there is an
unprecedented opportunity to use the Higgs as a probe for physics beyond the
Standard Model. I will discuss a variety of recent ideas to look for new
physics via the Higgs, including measurements of Higgs couplings and associated
indirect observables; searches for Higgs production in association with new
physics; and strategies for probing extended electroweak symmetry breaking
sectors.

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Mardi oct 02, 2012
Speaker(s): 

The
phenomenological Minimal Supersymmetric Standard Model (pMSSM) provides a broad
perspective on supersymmetric phenomenology. We have generated two large sets
of pMSSM models with neutralino and gravitino LSPs, with sparticle masses
extending up to 4 TeV. In this talk, I will discuss the implications of
searches for supersymmetry and the Higgs, with particular attention to
naturalness. In particular, we find that while sparticle spectra with
moderately light stops are still allowed, such stops are difficult to find

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Mardi sep 18, 2012
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The LHC detectors are allowing experimentalists to look
"inside" of jets and study the properties of these. Jet substructure
gives us the tools to study  boosted resonances that decay into jets. In
this talk, I will discuss an extension of substructure techniques to beyond the
Standard Model signals where reconstructing resonances may not be optimal, but
these techniques still allow us to pick out these signals from a busy QCD
environment.

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