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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.

Flavored Dark Matter: Direct Detection and Collider Signals

Submitted by Anonymous on November 3, 2012 - 9:37pm
Wednesday Dec 07, 2011
Speaker(s): 
Prateek Agrawal

I will present a class of models in which the dark matter particle carries flavor quantum numbers, and has renormalizable contact interactions with Standard Model fields. In particular, I will focus on models where the dark matter flavor is identified with lepton flavor in the Standard Model. The region of parameter space where the dark matter has the right abundance to be a thermal relic is accessible at current direct detection experiments.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Search for New Non-standard Decay Modes of SM-like Higgs at the LHC

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Dec 06, 2011
Speaker(s): 
Jinrui Huang

We present strategies of searching for supersymmetric non-standard decays of Standard Model (SM)-like Higgs bosons (h2) at the Large Hadron Collider (LHC), motivated by ''Dark Light Higgs'' (DLH) scenario. The DLH sccenario represents a limit of the nearly-Peccei-Quinn-symmetric Next-to-Minimal Supersymmetric Standard Model, where there naturally co-exist two light singlet-like particles: a scalar (h1), a pseudoscalar (a1), and a light singlino-like DM candidate (\chi_1), all with masses of order 10 GeV or below.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Channeling and Directional Features in Direct Dark Matter Detection

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Dec 06, 2011
Speaker(s): 
Nassim Bozorgnia

The channeling of the ion recoiling after a collision with a WIMP produces a larger ionization/scintillation signal in direct dark matter detection experiments than otherwise expected. I will present estimates of the channeling fractions and their impact on data fits. I will also discuss the possibility of having a daily modulation of the signal due to channeling. Since this modulation depends on the recoil directions and thus on the orientation of the detector with respect to the galaxy, it would be a background free signature.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Scale Without Conformal Invariance

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Nov 29, 2011
Speaker(s): 
Jean-Francois Fortin

We investigate the theoretical implications of scale without conformal invariance in quantum field theory. We argue that the RG flows of such theories correspond to recurrent behaviors, i.e. limit cycles or ergodicity. We discuss the implications for the a-theorem and show how dilatation generators do generate dilatations. Finally, we discuss possible well-behaved non-conformal scale-invariant examples.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Magnetic Properties of (Holographic) Superconductors

Submitted by Anonymous on November 3, 2012 - 9:37pm
Monday Nov 28, 2011
Speaker(s): 
Alberto Salvio

I will discuss magnetic properties of superconductors, first in a model independent way and then by using holographic models. This approach has the advantage of highlighting the generic features of superconducting materials and, at the same time, the predictions of specific models. I will start with the Meissner effect and the vortices. Given the importance of the magnetic field dynamics in these phenomena, I will describe how to introduce a dynamical gauge field in holography.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

New CP violating observables for the LHC

Submitted by Anonymous on November 3, 2012 - 9:37pm
Friday Nov 25, 2011
Speaker(s): 
Joshua Berger

I discuss new types of CP violating observables that arise in three body decays that are dominated by an intermediate resonance.  If two interfering diagrams with different orderings of the final state particles exist, the required CP even phase arises due to the different virtualities of the resonance in each of the two diagrams.  Using momentum asymmetries, I demonstrate that CP violation can be seen in this way at the LHC and future colliders.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Monojet Events: a Journey Into the Standard Model and Beyond

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Nov 22, 2011
Speaker(s): 
Hugo Beauchemin

The Standard Model is currently the theory which describes the most fundamental constituents of matter and the forces which govern their interactions. Since the start-up of the LHC accelerator, the ATLAS detector has collected sufficient data to allow tests of this theory at the smallest distance scales ever probed. The objective is to find significant deviations between the observed data and the Standard Model predictions, revealing the existence of new phenomena.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

A WIMPy Baryogenesis Miracle

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Nov 15, 2011
Speaker(s): 
Brian Shuve

We propose models of symmetric WIMP dark matter in which dark matter annihilations generate the baryon asymmetry. We call this mechanism "WIMPy baryogenesis". This provides a dynamical connection between the late-time abundances of both dark matter and baryons. We construct explicit models of leptogenesis and baryogenesis at the weak scale, and find the "miraculous" result that, for order one couplings and weak scale masses for any new fields, the baryon asymmetry and dark matter relic density from WIMPy baryogenesis match the observed values.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

Results on Searches from the CMS Experiment at the LHC

Submitted by Anonymous on November 3, 2012 - 9:37pm
Friday Nov 11, 2011
Speaker(s): 
Albert De Roeck

The LHC has just concluded this year's proton-proton run at 7 TeV CM energy, producing more than 5fb-1of data.
While the full data sample collected by the CMS experiment will be analyzed over the winter, many of the present searches
for new physics have been completed with 1-2 fb-1. In this talk we will present the most recent updates on the search analyses in CMS, including
the Higgs search, searches for supersymmetry, and a plethora of other BSM models, such as extra dimensions, Z's, W_R, leptoquarks, and more.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

First EXO Results: Observation of Two-Neutrino Double-Beta Decay in 136Xe

Submitted by Anonymous on November 3, 2012 - 9:37pm
Tuesday Oct 25, 2011
Speaker(s): 
Jacques Farine

The Enriched Xenon Observatory (EXO) collaboration has observed the two-neutrino double beta decay of 136Xe with EXO-200, a prototype to the full EXO detector in development. This second order process, predicted by the Standard Model, has been observed for several nuclei but not for 136Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrino-less double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.

Collection/Series: 
Particle Physics
Scientific Areas: 
Particle Physics

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