Particle Physics

Particle physics is the science which identifies nature's constituents and interactions at the most fundamental level, with an emphasis on comparing theoretical ideas with both terrestrial experiments and astrophysical observations. This mandate gives it a strong overlap with string theory, quantum gravity and cosmology. Particle physicists at Perimeter Institute are currently involved in identifying how cosmological observations and terrestrial accelerator and underground experiments constrain the theoretical possibilities for physics beyond the Standard Model.

Displaying 781 - 792 of 1410

12/13 PSI - Standard Model Review Lecture 3

Mark Wise
California Institute of Technology (Caltech)
January 09, 2013

PIRSA:13010026
Particle Physics
12/13 PSI - Standard Model Review Lecture 2

Mark Wise
California Institute of Technology (Caltech)
January 08, 2013

PIRSA:13010025
Particle Physics
12/13 PSI - Standard Model Review Lecture 1

Mark Wise
California Institute of Technology (Caltech)
January 07, 2013

PIRSA:13010024
Particle Physics
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes

Matthew Williams
PROTO Manufacturing (Canada)
December 14, 2012

PIRSA:12120039
Particle Physics
Light sleptons, Higgs phenomenology and the vacuum

Stefania Gori
University of California, Santa Cruz
December 07, 2012

PIRSA:12120018
Particle Physics
New electroweak states in plain sight

Patrick Meade
Stony Brook University - C. N. Yang Institute for Theoretical Physics
December 04, 2012

PIRSA:12120017
Particle Physics
Stealthy, Composite Stops

Philip Tanedo
Cornell University
November 13, 2012

PIRSA:12110063
Particle Physics
New Results in Jet Substructure
October 23, 2012

PIRSA:12100128
Particle Physics
Photons and Quantum Gravity in Astrophysics
- Robert Nemiroff
  Michigan Technological University
- Giovanni Amelino-Camelia
  Sapienza Università di Roma - Dipartimento di Fisica
- Niayesh Afshordi
  University of Waterloo
- Joao Magueijo
  Imperial College London
- Alfio Bonanno
  National Institute for Astrophysics (INAF)
- Robert Brandenberger
  McGill University - Department of Physics
October 22, 2012

PIRSA:12100085
Quantum Gravity

Particle Physics
Now what?: Higgs physics after discovery

Nathaniel Craig
University of California, Santa Barbara
October 16, 2012

PIRSA:12100060
Particle Physics
A Higgs but no sparticles yet: what it means for the (p)MSSM

Ahmed Ismail
University of Pittsburgh
October 02, 2012

PIRSA:12100052
Particle Physics
Jet Substructure, by Accident

Eder Izaguirre
LinkedIn (United States)
September 18, 2012

PIRSA:12090063
Particle Physics

12/13 PSI - Standard Model Review Lecture 3

Mark Wise
California Institute of Technology (Caltech)
January 09, 2013

PIRSA:13010026
Particle Physics
12/13 PSI - Standard Model Review Lecture 2

Mark Wise
California Institute of Technology (Caltech)
January 08, 2013

PIRSA:13010025
Particle Physics
12/13 PSI - Standard Model Review Lecture 1

Mark Wise
California Institute of Technology (Caltech)
January 07, 2013

PIRSA:13010024
Particle Physics
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes

Matthew Williams
PROTO Manufacturing (Canada)
December 14, 2012

PIRSA:12120039
Particle Physics
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 unexpected results, and present a one-loop contribution to the 4D vacuum energy whose size is set by the KK scale.
Light sleptons, Higgs phenomenology and the vacuum

Stefania Gori
University of California, Santa Cruz
December 07, 2012

PIRSA:12120018
Particle Physics
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 phenomenology of this model and with the prospects of probing it at the LHC, through the direct production of light staus.
New electroweak states in plain sight

Patrick Meade
Stony Brook University - C. N. Yang Institute for Theoretical Physics
December 04, 2012

PIRSA:12120017
Particle Physics
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.
Stealthy, Composite Stops

Philip Tanedo
Cornell University
November 13, 2012

PIRSA:12110063
Particle Physics
Light third generation superpartners are one way to avoid bounds on new physics from the early LHC. We will review the theory and phenomenology of light stops and highlight a particular UV model based a partially composite electroweak sector through Seiberg duality.
New Results in Jet Substructure
October 23, 2012

PIRSA:12100128
Particle Physics
We present new results on the performance of jet substructure techniques and their use in distinguishing the signatures of new boosted massive particles from the QCD background. Advanced approaches to jet reconstruction using jet grooming algorithms such as filtering, trimming, and pruning are compared. Measurements of the jet invariant mass for each jet algorithm are compared both at the particle level to multiple Monte Carlo event generators and at the detector level for several configurations of the jet grooming algorithms. The performance of these strategies and improvements in search sensitivity for new boosted hadronic particles are compared. Recent results using these techniques for both boosted RPV gluinos and top quark pairs from new particles are presented. The result is a comprehensive foundation for the use of substructure algorithms in the search for new physics at the LHC
Photons and Quantum Gravity in Astrophysics
- Robert Nemiroff
  Michigan Technological University
- Giovanni Amelino-Camelia
  Sapienza Università di Roma - Dipartimento di Fisica
- Niayesh Afshordi
  University of Waterloo
- Joao Magueijo
  Imperial College London
- Alfio Bonanno
  National Institute for Astrophysics (INAF)
- Robert Brandenberger
  McGill University - Department of Physics
October 22, 2012

PIRSA:12100085
Quantum Gravity

Particle Physics
Asymptotically safe inflation and CMB polarization
The presence of complex critical exponents in the scaling behavior of the Newton constant and Cosmological constant has dramatic consequences at the inflation scale. In particular an infinite number of unstable de-Sitter vacua emerges from an effective quantum gravitational action. In this framework, the possibility of detecting specific signaturesof a non-gaussian fixed point of the gravitational interactions in the CMB polarization spectrum will then be discussed.

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Cosmological windows such as CMB polarization and 21cm redshift surveys to probe Planck-scale physics

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Quantum gravity and a chiral signature in gravity waves
I show how quantum gravity could lead to a chiral signature in the graviational wave background, proportional to the imaginary part of the Immirzi parameter. This would leave a distinctive imprint in the polarization of the cosmic microwave background. I will discuss how this isue is closely related to that of identifying the ground of base state for quantum gravity.

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A Possible Bound on Spectral Dispersion from Fermi-Detected Gamma Ray Burst 090510A
Three photons spanning about 30 GeV arrived within about one millisecond from the Fermi-detected GRB 090510A at a redshift of about 0.9. Although conceivably a > 3Ïƒ statistical fluctuation when taken at face value this photon bunch -- quite possibly a classic GRB pulse -- leads to a relatively tight bound on the ability of our universe to disperse high energy photons. Specifically given a generic dispersion relation where the time delay is proportional to the photon energy to the first power the limit on the dispersion strength is k1 < 1.61Ã—10-5 sec Gpc-1 GeV-1. In the context of some theories of quantum gravity this conservative bound translates into an minimum energy scale greater than 525 m_Planck suggesting that spacetime is smooth at energies perhaps three orders of magnitude over the Planck mass.
Now what?: Higgs physics after discovery

Nathaniel Craig
University of California, Santa Barbara
October 16, 2012

PIRSA:12100060
Particle Physics
With the discovery of a new Higgs-like particle at the LHC, there is an unprecedented opportunity to use the Higgs as a probe for physics beyond the Standard Model. I will discuss a variety of recent ideas to look for new physics via the Higgs, including measurements of Higgs couplings and associated indirect observables; searches for Higgs production in association with new physics; and strategies for probing extended electroweak symmetry breaking sectors.
A Higgs but no sparticles yet: what it means for the (p)MSSM

Ahmed Ismail
University of Pittsburgh
October 02, 2012

PIRSA:12100052
Particle Physics
The phenomenological Minimal Supersymmetric Standard Model (pMSSM) provides a broad perspective on supersymmetric phenomenology. We have generated two large sets of pMSSM models with neutralino and gravitino LSPs, with sparticle masses extending up to 4 TeV. In this talk, I will discuss the implications of searches for supersymmetry and the Higgs, with particular attention to naturalness. In particular, we find that while sparticle spectra with moderately light stops are still allowed, such stops are difficult to find experimentally because of a wide array of possible cascade decays.
Jet Substructure, by Accident

Eder Izaguirre
LinkedIn (United States)
September 18, 2012

PIRSA:12090063
Particle Physics
The LHC detectors are allowing experimentalists to look "inside" of jets and study the properties of these. Jet substructure gives us the tools to study boosted resonances that decay into jets. In this talk, I will discuss an extension of substructure techniques to beyond the Standard Model signals where reconstructing resonances may not be optimal, but these techniques still allow us to pick out these signals from a busy QCD environment.

Title	Speaker(s)	Date	Talk Type	Info link
12/13 PSI - Standard Model Review Lecture 3	Mark Wise	2013-01-09	Course	View details
12/13 PSI - Standard Model Review Lecture 2	Mark Wise	2013-01-08	Course	View details
12/13 PSI - Standard Model Review Lecture 1	Mark Wise	2013-01-07	Course	View details
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes	Matthew Williams	2012-12-14	Scientific Series	View details
Light sleptons, Higgs phenomenology and the vacuum	Stefania Gori	2012-12-07	Scientific Series	View details
New electroweak states in plain sight	Patrick Meade	2012-12-04	Scientific Series	View details
Stealthy, Composite Stops	Philip Tanedo	2012-11-13	Scientific Series	View details
New Results in Jet Substructure		2012-10-23	Scientific Series	View details
Photons and Quantum Gravity in Astrophysics	Robert Nemiroff, Giovanni Amelino-Camelia, Niayesh Afshordi, Joao Magueijo, Alfio Bonanno, Robert Brandenberger	2012-10-22	Conference	View details
Now what?: Higgs physics after discovery	Nathaniel Craig	2012-10-16	Scientific Series	View details
A Higgs but no sparticles yet: what it means for the (p)MSSM	Ahmed Ismail	2012-10-02	Scientific Series	View details
Jet Substructure, by Accident	Eder Izaguirre	2012-09-18	Scientific Series	View details

Particle Physics

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