Particle Physics

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

Seminar Series Events/Videos

TBA
Apr 7 2015 - 1:00pm
Room #: 400
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TBA
Apr 21 2015 - 1:00pm
Room #: 400
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TBA
Apr 28 2015 - 1:00pm
Room #: 400
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TBA
May 8 2015 - 1:00pm
Room #: 394
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TBA
May 12 2015 - 1:00pm
Room #: 400
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TBA
May 19 2015 - 1:00pm
Room #: 400
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May 26 2015 - 1:00pm
Room #: 400
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Tuesday Mar 10, 2015
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I will talk about the physics of models in which dark matter consists of composite bound states carrying a large conserved dark “nucleon” number. The properties of sufficiently large dark nuclei may obey simple scaling laws, and this scaling can determine the number distribution of nuclei resulting from Big Bang Dark Nucleosynthesis. For plausible models of asymmetric dark matter, dark nuclei of large nucleon number, e.g. >~ 10^8, may be synthesised, with the number distribution taking one of two characteristic forms, which interestingly are broadly independent of initial conditions.

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Tuesday Mar 03, 2015
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It is not known how to explain the excess of matter over antimatter with the Standard Model. This matter asymmetry can be accounted for in certain extensions of the Standard Model through the mechanism of electroweak baryogenesis (EWBG), in which the extra baryons are created in the early Universe during the electroweak phase transition.

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Friday Feb 27, 2015
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I will describe a new collider object we have termed emerging jets.

These can arise when there is a confining dark sector connected to the

Standard Model by a TeV scale mediator, a scenario that is well

motivated by dark matter considerations. The signature of an emerging

jet is O(10) displaced vertices inside the jet each with different

impact parameter, and a small number of prompt tracks. I will describe

strategies that can be used to discover emerging jets even if they

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Tuesday Feb 24, 2015
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We introduce and systematically study an expansive class of "orbifold Higgs" theories in which the weak scale is protected by accidental symmetries arising from the orbifold reduction of continuous symmetries. The protection mechanism eliminates quadratic sensitivity of the Higgs mass to higher scales at one loop (or more) and does not involve any new states charged under the Standard Model.

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Friday Feb 20, 2015
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The Higgs boson was discovered at the LHC more than two years ago.

So far, the LHC data is consistent with the Standard Model (SM)

predictions. Given its increased rate in the next run of the LHC

with a center-of-mass energy of 14 TeV, double Higgs production will

become an important channel in the search for deviations from the SM

due to new heavy particles. The study of double Higgs production is

also important for understanding the structure of the scalar potential.

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Tuesday Feb 17, 2015
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The Higgs couplings to fermions are known parameters within the Standard Model. Deviations from these

expectations would be clear signals of new physics and are thus important target measurements for the LHC program.

In this talk I shall discuss ways to extra information about the coupling of the Higgs boson to the charm quark with

emphasis on methods applicable with the available LHC data set. A novel method based on the current ATLAS and CMS

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Tuesday Jan 20, 2015
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If dark matter is asymmetric, fermionic, and self-interacting, it may form black holes in pulsars at the galactic center. In this case, a measurable maximum attainable pulsar age would track the density of the dark matter halo, with the oldest pulsars being allowed in the least dense parts of the halo. This could explain a recent observation, that there are not as many pulsars in the galactic center as expected.

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Tuesday Dec 09, 2014
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The cosmological model based on cold dark matter (CDM) and dark energy has been hugely successful in describing the observed evolution and large scale structure of our Universe. However, at small scales (in the smallest galaxies and at the centers of larger galaxies), a number of observations seem to conflict with the predictions CDM cosmology, leading to recent interest in Warm Dark Matter (WDM) and Self-Interacting Dark Matter (SIDM) models. These small scales, though, are also regions dominated by the influence of baryons.

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Wednesday Dec 03, 2014
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In the search for dark matter, neutrino experiments can play a key role by doubling as dark matter production and detection experiments. I will describe how the proposed DAEdALUS decay-at-rest neutrino experiment can be used to search for MeV-scale dark matter, with particular emphasis on dark matter produced through a dark photon in rare neutral pion decays. The fact that the dark photon need not be on-shell opens up a wide range of new possibilities for the experimental program of searching for dark matter at neutrino experiments.

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Tuesday Dec 02, 2014
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Recent comparison between observation and expectation could point to problems with the standard cold, non-interacting dark matter picture, one of which being how small the smallest gravitationally bound dark matter halos are. I will review the cold dark matter picture and the experimental tests. One solution to the problems comes from coupling the dark matter to neutrinos. I will describe the model building requirements of such a coupling and determine how to test this scenario.

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