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 Jul 09, 2013
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We consider the production of strongly interacting, heavy SUSY pairs at the LHC. When the centre of mass energy is close to the production threshold of the pair, the corresponding cross sections receive large higher-loop QCD corrections. These corrections are classified as the so-called soft logarithms and Coulomb singularities and they lead to a break down of the usual perturbation expansion. In this talk I review the origin of these large corrections and explain how they can be resummed by using Effective Field theories.

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Tuesday Apr 30, 2013
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In this talk, I will start with
briefly introducing some universal physics behind quantum hall and topological
insulator , which inspired a BSM flavor model. It intimately relates
deconstructed little Higgs to flavor structure: fermion masses, CKM etc.
 This new cousin of little Higgs, we call it little flavor, shares a 10-20
Tev cut-off scale with little Higgs, so as to explain flavor structure at
surprisingly low scale without rising FCNC problem.

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Tuesday Apr 02, 2013
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Physics
is at a crossroad that leads either to Naturalness or the Multiverse. While the
confirmation of gauge coupling unification in the early 90s gave a tremendous
boost to naturalness and to low energy SUSY, the lack of evidence
for new physics beyond the standard model at the LHC points to a paucity of new
particles near the weak scale. This suggests that the weak scale is tuned and
that supersymmetry, if present at all, is realized at higher energies. This

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Tuesday Mar 26, 2013
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I introduce a new
nonrelativistic effective field theory which systematically accounts for the finite lifetime effects in production of unstable
particles.

The theory is applied to the threshold production of top quark-antiquark
pairs.

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Tuesday Mar 19, 2013
Speaker(s): 

The Standard Model Higgs boson may be mixed
with another scalar that does not couple singly to gauge bosons or fermions.
The electroweak quantum numbers of such an additional scalar can be determined
by measuring the quartic Higgs-Higgs-vector-vector couplings, which
contribute—along with the coveted triple Higgs coupling—to double Higgs
production in e+e− collisions. We show that simultaneous sensitivity
to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling

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Tuesday Mar 12, 2013
Speaker(s): 

The Standard Model Higgs boson may be mixed
with another scalar that does not couple singly to gauge bosons or fermions.
The electroweak quantum numbers of such an additional scalar can be determined
by measuring the quartic Higgs-Higgs-vector-vector couplings, which
contribute—along with the coveted triple Higgs coupling—to double Higgs
production in e+e− collisions. We show that simultaneous sensitivity
to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling

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Friday Mar 08, 2013
Speaker(s): 

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,

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Tuesday Mar 05, 2013
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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

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Tuesday Feb 26, 2013
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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

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Tuesday Feb 19, 2013
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The
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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