Particle Physics

481 talks

S012

Collection TypeSeries

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Displaying 325 - 336 of 481

Classical Space Times from S Matrices

Ira Rothstein Carnegie Mellon University
November 26, 2013

PIRSA:13110053
High Energy Physics
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Christopher Brust
November 19, 2013

PIRSA:13110051
High Energy Physics
Baryogenesis from WIMPs
November 12, 2013

PIRSA:13110046
High Energy Physics
Induced Electroweak Symmetry Breaking and Supersymmetry

Jamison Galloway New York University (NYU)
November 05, 2013

PIRSA:13110050
High Energy Physics
Split Dirac Supersymmetry and a Higgsino LSP
November 01, 2013

PIRSA:13110052
High Energy Physics
Minimal Distances and the RG Flow
October 29, 2013

PIRSA:13100069
High Energy Physics
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky
October 18, 2013

PIRSA:13100107
High Energy Physics
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University
October 15, 2013

PIRSA:13100103
High Energy Physics
Electroweak Cogenesis and a CP Violating Higgs Boson
September 24, 2013

PIRSA:13090077
High Energy Physics
The local Callan-Symanzik equation: structure and applications

Boaz Keren-Zur L'Ecole Polytechnique Federale de Lausanne (EPFL)
September 06, 2013

PIRSA:13090067
High Energy Physics
Bottom-up Naturalness

Sonia El Hedri Stanford University
August 27, 2013

PIRSA:13080056
High Energy Physics
The Dark Side of Matter

Itay Yavin McMaster University

July 17, 2013

PIRSA:13070032

Classical Space Times from S Matrices

Ira Rothstein Carnegie Mellon University
November 26, 2013

PIRSA:13110053
High Energy Physics
Progress in calculating S matrix elements have shown that the malicious redundancies in non-linear gauge theories can be circumvented by utilizing unitarity methods in conjunction with BCFW recursion relations. When calculating in this fashion all of the interaction vertices beyond the three point function can be ignored. This simplification is especially useful in gravity which contains an infinite number of such non-linear interactions. It is natural to ask whether off-shell quantities, such as classical solutions, can also be generated using only the three point vertex. In this talk I will show that this is indeed the case by extracting classical solutions to GR from on-hell two to two scattering S-matrix elements. In so doing we will completely circumvent the action as well as the equations of motion. The only inputs will be Lorentz invariance, the existence of a massless spin-two particle and locality. Because of the double copy relation this implies there exists, a yet to be understood, connection between solutions to Yang-Mills theory and Gravity. I will also discuss how this technique can be used to simplify calculations of higher order post-Newtonian corrections to gravitational potentials relevant to the problem of binary inspirals.
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Christopher Brust
November 19, 2013

PIRSA:13110051
High Energy Physics
The effective number of neutrino species in our universe, Neff, is capable of probing the presence of new light or massless species in our universe. I will first review relevant facts about both CMB measurements of new light species and thermodynamics in the early universe. Then, I will present the effects of many models of BSM physics containing new light species on the CMB, including models containing eV-scale sterile neutrinos compatible with anomalies in neutrino experiments, and interpret the compatibility of the parameter space of these models in terms of the recent results from the Planck satellite. I will argue that the bounds on couplings obtained from the Planck measurement of the CMB are competitive with bounds coming from other areas of physics.
Baryogenesis from WIMPs
November 12, 2013

PIRSA:13110046
High Energy Physics
We propose a robust, unified framework, in which the similar baryon and dark matter cosmic abundances both arise from the physics of weakly interacting massive particles (WIMPs), with the rough quantitative success of the so-called “WIMP miracle”. In particular the baryon asymmetry arises from the decay of a meta-stable WIMP after its thermal freezeout at or below the weak scale. A minimal model and its embedding in R-parity violating (RPV) natural SUSY are studied as examples. The new mechanism saves RPV SUSY from the potential crisis of washing out primordial baryon asymmetry. We also consider the embedding of this idea in RPV split SUSY, where the mechanism works within the minimal model, and independently motivates the mini-split scale. Phenomenological implications for the LHC and precision tests are discussed.
Induced Electroweak Symmetry Breaking and Supersymmetry

Jamison Galloway New York University (NYU)
November 05, 2013

PIRSA:13110050
High Energy Physics
I'll discuss a class of supersymmetric models in which the physical Higgs mass is freed from the quartic coupling, thereby allowing for a 125 GeV Higgs state whose self-interaction can be much smaller than in the SM via a mechanism of 'induced EWSB'. This class of models provides a unique alternative to other realizations of natural SUSY, and the simplest realizations necessitate additional characteristic scalars below the TeV scale, thus altering phenomenological predictions for additional Higgses at the LHC.
Split Dirac Supersymmetry and a Higgsino LSP
November 01, 2013

PIRSA:13110052
High Energy Physics
TBA
Minimal Distances and the RG Flow
October 29, 2013

PIRSA:13100069
High Energy Physics
We will discuss the renormalization group flow between different classes of CFTs in four dimensions and study possible lower bounds on the "distances" between these theories.
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky
October 18, 2013

PIRSA:13100107
High Energy Physics
Heavy particle expansions, familiar from heavy quark physics, have found important applications in the analysis of dark matter candidates and their interactions with the Standard Model. From a different direction, precision spectroscopy of muonic hydrogen has challenged QED and required more precise knowledge of proton structure. These problems have forced a closer examination of the construction of general heavy particle lagrangians at high orders in the 1/M expansion, and in the absence of known ultraviolet completions. Key aspects of this formalism, including the emergence of Lorentz invariance from "nonrelativistic" lagrangians, are reviewed, and several applications are presented. A status report on the proton radius puzzle is given.
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University
October 15, 2013

PIRSA:13100103
High Energy Physics
Searches for physics beyond the standard model come in many forms, from terrestrial probes to astroparticle experiments and cosmological observations. Efforts to combine multiple search channels in 'global fits' to new physics scenarios typically consider only a subset of the available channels. Astroparticle searches in particular are usually only included in a very approximate way, if at all. In this talk I will review recent progress in including detailed gamma-ray, neutrino and CMB searches for dark matter in global fits. I will also preview some of the future developments and challenges in this field, where the applicability of global fits will move well beyond the small range of constrained supersymmetric models they have so far mostly been applied to.
Electroweak Cogenesis and a CP Violating Higgs Boson
September 24, 2013

PIRSA:13090077
High Energy Physics
We propose a simple renormalizable model of baryogenesis and asymmetric dark matter generation at the electroweak phase transition. Our setup utilizes the two Higgs doublet model plus two complex gauge singlets, the lighter of which is stable dark matter. The dark matter is charged under a global symmetry that is broken in the early universe but restored during the electroweak phase transition. Because the ratio of baryon and dark matter asymmetries is controlled by model parameters, the dark matter need not be light. Thus, new force carriers are unnecessary and the symmetric dark matter abundance can be eliminated via Higgs portal interactions alone. The dark matter mass is also constrained within a window around the weak scale. One of the main predictions of this model is CP violating Higgs signals at the LHC and future colliders.
The local Callan-Symanzik equation: structure and applications

Boaz Keren-Zur L'Ecole Polytechnique Federale de Lausanne (EPFL)
September 06, 2013

PIRSA:13090067
High Energy Physics
The local Callan-Symanzik equation describes the response of a quantum field theory to local scale transformations in the presence of background sources. The consistency conditions associated with this anomalous equation can be used to derive powerful constraints on RG flows. We will discuss various aspects of the equation and present new results regarding the structure of the anomaly. We then use the equation to write correlation functions of the trace of the energy-momentum tensor off-criticality.
Bottom-up Naturalness

Sonia El Hedri Stanford University
August 27, 2013

PIRSA:13080056
High Energy Physics
We study the naturalness problem using a model independent bottom up approach by considering models where only the interaction terms needed to cancel the Higgs quadratic divergences are present. If quadratic divergences are canceled by terms linear in the Higgs field, then the collider phenomenology is well covered by current electroweakino and fourth generation searches. If quadratic divergences are canceled by terms bilinear in the Higgs field, then the signatures are highly dependent on the quantum numbers of the new particles. Precision Higgs measurements can reveal the presence of new particles with either vevs or Standard Model charges. If the new particles are scalar dark matter candidates, their direct and indirect detection signatures will be highly correlated and within the reach of XENON100 and Fermi. Observation at one of these experiments would imply observation at the other one. Observable LHC decay channels can also arise if the new particles mix with lighter states. This decay channel involves only the Higgs boson and not the gauge bosons. Observation of such decays would give evidence that the new particle is tied to the naturalness problem.
The Dark Side of Matter

Itay Yavin McMaster University

July 17, 2013

PIRSA:13070032

Title	Speaker(s)	Date	Talk Type	Info
Classical Space Times from S Matrices	Ira Rothstein	2013-11-26	Scientific Series	View details
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar	Christopher Brust	2013-11-19	Scientific Series	View details
Baryogenesis from WIMPs		2013-11-12	Scientific Series	View details
Induced Electroweak Symmetry Breaking and Supersymmetry	Jamison Galloway	2013-11-05	Scientific Series	View details
Split Dirac Supersymmetry and a Higgsino LSP		2013-11-01	Scientific Series	View details
Minimal Distances and the RG Flow		2013-10-29	Scientific Series	View details
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle	Richard Hill	2013-10-18	Scientific Series	View details
Including astroparticle observables in global fits to new physics scenarios	Patrick Scott	2013-10-15	Scientific Series	View details
Electroweak Cogenesis and a CP Violating Higgs Boson		2013-09-24	Scientific Series	View details
The local Callan-Symanzik equation: structure and applications	Boaz Keren-Zur	2013-09-06	Scientific Series	View details
Bottom-up Naturalness	Sonia El Hedri	2013-08-27	Scientific Series	View details
The Dark Side of Matter	Itay Yavin	2013-07-17		View details

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Format results

Classical Space Times from S Matrices

New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Baryogenesis from WIMPs

Induced Electroweak Symmetry Breaking and Supersymmetry

Split Dirac Supersymmetry and a Higgsino LSP

Minimal Distances and the RG Flow

Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Including astroparticle observables in global fits to new physics scenarios

Electroweak Cogenesis and a CP Violating Higgs Boson

The local Callan-Symanzik equation: structure and applications

Bottom-up Naturalness

The Dark Side of Matter

Classical Space Times from S Matrices

New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Baryogenesis from WIMPs

Induced Electroweak Symmetry Breaking and Supersymmetry

Split Dirac Supersymmetry and a Higgsino LSP

Minimal Distances and the RG Flow

Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Including astroparticle observables in global fits to new physics scenarios

Electroweak Cogenesis and a CP Violating Higgs Boson

The local Callan-Symanzik equation: structure and applications

Bottom-up Naturalness

The Dark Side of Matter