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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.


Vendredi mar 08, 2013

We have made a new
measurement of the electron’s electric dipole moment (EDM) using a beam of YbF
molecules.    By measuring atto-eV energy shifts in a molecule, this
experiment probes new physics at the tera-eV energy scale. According to the
standard model, this EDM is d_e=10^(-38) e.cm
– some eleven orders of magnitude below the current experimental limit.
However, most extensions to the standard model predict much larger values,

Scientific Areas: 


Mardi mar 05, 2013

It is known that the correlator
of one axial and two vector currents, that receives leading contributions
through one-loop fermion triangle diagrams, is not modified by QCD radiative
corrections at two loops. It was suggested that this non-renormalization of the
VVA correlator persists in higher orders in perturbative QCD as well. To check
this assertion, I compute the three-loop QCD corrections to the
VAA-correlator using the technique of asymptotic expansions. I find that

Scientific Areas: 


Mardi fév 26, 2013

Last year strong evidence was
claimed for a 130 GeV gamma ray line from the galactic center in the FERMI
telescope data.  In the first half of the talk I will review the status of
the evidence, including recent suggestions which call it into question.
 In the second half of the talk, under the bold assumption that the line
is a genuine signature of dark matter, I will review some of the properties
required of dark matter to explain the line and the general features of models

Scientific Areas: 


Mardi fév 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

Scientific Areas: 


Vendredi 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. 

Scientific Areas: 


Mardi déc 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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Vendredi déc 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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Vendredi déc 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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Mardi déc 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.

Scientific Areas: