High Energy Physics

Displaying 1705 - 1716 of 3170

Testing QED with positronium state

Alexander Penin University of Alberta
August 26, 2014

PIRSA:14080038
High Energy Physics
Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation

Anson Hook University of Maryland, College Park
July 29, 2014

PIRSA:14070019
High Energy Physics
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Ibrahima Bah University of Southern California (USC)
July 22, 2014

PIRSA:14070032
High Energy Physics
Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Jaewon Song University of California, San Diego
July 15, 2014

PIRSA:14070024
High Energy Physics
Improving Mass Measurements Using Many-Body Phase Space

Can Kilic The University of Texas at Austin
July 15, 2014

PIRSA:14070023
High Energy Physics
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign
June 17, 2014

PIRSA:14060047
High Energy Physics
What Can We Learn from Precision Higgs

Maxim Perelstein Cornell University
June 13, 2014

PIRSA:14060003
High Energy Physics
Gauge fields in de Sitter space: antipodal symmetry and holography

Yasha Neiman Okinawa Institute of Science and Technology Graduate University
June 03, 2014

PIRSA:14060039
High Energy Physics
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Atri Bhattacharya University of Liège
May 22, 2014

PIRSA:14050118
High Energy Physics
M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
High Energy Physics
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
High Energy Physics
New strong interactions and the t t-bar asymmetry

Joachim Brod University of Cincinnati
May 13, 2014

PIRSA:14050092
High Energy Physics

Testing QED with positronium state

Alexander Penin University of Alberta
August 26, 2014

PIRSA:14080038
High Energy Physics
The theory of quantum electrodynamics is recognized for the most accurate predictions in physics confirmed by experiment. I review the recent results on high precision tests of QED with an emphasize on the study of the positronium bound state.
Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation

Anson Hook University of Maryland, College Park
July 29, 2014

PIRSA:14070019
High Energy Physics
We show that in the presence of a chemical potential, black hole evaporation generates baryon number. If the inflaton or Ricci scalar is derivatively coupled to the B-L current, the expansion of the universe acts as a chemical potential and splits the energy levels of particles and their anti-particles. The asymmetric Hawking radiation of primordial black holes can thus be used to generate a B-L asymmetry. If dark matter is produced by the same mechanism, the coincidence between the mass density of visible and dark matter can be naturally explained.
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Ibrahima Bah University of Southern California (USC)
July 22, 2014

PIRSA:14070032
High Energy Physics
We provide a framework for describing gravity duals of four-dimensional N=1 superconformal field theories obtained by compactifying a stack of M5-branes on a Riemann surface. The gravity solutions are completely specified by two scalar potentials whose pole structures on the Riemann surface correspond to the spectrum of punctures that labels different theories. We discuss how to identify these puncture in gravity.
Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Jaewon Song University of California, San Diego
July 15, 2014

PIRSA:14070024
High Energy Physics
We study a class of 4d N=1 SCFTs obtained from partial compactifications of 6d N=(2, 0) theory on a Riemann surface with punctures. We identify theories corresponding to curves with general type of punctures through nilpotent Higgsing and Seiberg dualities. The `quiver tails' of N=1 class S theories turn out to differ significantly from N=2 counterpart and have interesting properties. Various dual descriptions for such a theory can be found by using colored pair-of-pants decompositions. Especially, we find N=1 analog of Argyres-Seiberg duality for the SQCD with various gauge groups. We compute anomaly coefficients and superconformal indices to verify our proposal.
Improving Mass Measurements Using Many-Body Phase Space

Can Kilic The University of Texas at Austin
July 15, 2014

PIRSA:14070023
High Energy Physics
After the 7 and 8 TeV LHC runs, we have no conclusive evidence of physics beyond the Standard Model, leading us to suspect that even if new physics is discovered during run II, the number of signal events may be limited, making it crucial to optimize measurements for the case of low statistics. I will argue that phase space correlations between subsequent on-shell decays in a cascade contain additional information compared to commonly used kinematic variables, and this can be used to significantly improve the precision and accuracy of mass measurements. The improvement is connected to the properties of the volume element of many-body phase space, and is particularly relevant to the case of low signal statistics.
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign
June 17, 2014

PIRSA:14060047
High Energy Physics
What Can We Learn from Precision Higgs

Maxim Perelstein Cornell University
June 13, 2014

PIRSA:14060003
High Energy Physics
In the coming years, LHC experiments will measure Higgs properties, such as its couplings, with increasing precision. Electron-positron Higgs factories, such as the ILC or TLEP, would be able to achieve even better precision. In this talk, I will discuss some of the physics questions that can be addressed by a precision Higgs coupling measurement program. First, the issue of naturalness of the electroweak scale can be addressed in a robust, model-independent manner. Second, the possibility of a first-order electroweak phase transition can be definitively probed, testing one of the necessary conditions of electroweak baryogenesis scenario.
Gauge fields in de Sitter space: antipodal symmetry and holography

Yasha Neiman Okinawa Institute of Science and Technology Graduate University
June 03, 2014

PIRSA:14060039
High Energy Physics
There is a proposed dS/CFT duality in 3+1 dimensions, with higher-spin gravity in the bulk subject to Bunch-Davies boundary conditions. I consider replacing these with antipodally symmetric conditions, which allow for real values of the bulk fields. I present spanning sets of solutions in global dS_4 for free gauge fields of all spins (including photons and gravitons), and use them to establish relations between antipodal symmetry and asymptotic behavior. Some of these relations can be extended to interacting theories, including ordinary and higher-spin gravity. I discuss the implications for antipodally symmetric dS/CFT.
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Atri Bhattacharya University of Liège
May 22, 2014

PIRSA:14050118
High Energy Physics
The IceCube detector has recently reported the observation of 28 events at previously unexplored energies. While the statistics of the observed events are still low, these events hint at the existence of a neutrino flux over and above the atmospheric neutrino background. We investigate the possibility that a significant component of the additional neutrino flux originates due to the decay of a very heavy dark matter (VHDM) particle via several possible channels into standard model particles. We show that a combination of a power law astrophysical neutrino spectrum and the neutrino flux from the decay of a DM species of mass in the range 150-400 TeV improves the fit to the observed neutrino events than that obtained from a best-fit astrophysical flux alone. Assuming the existence of an astrophysical background described by the IC best-fit, we also show that, for the decay of even heavier DM particles ($m_{\text{DM}} \sim 1$ PeV), the same observations impose significant constraints on the decay lifetimes. Allowing the astrophysical flux normalization to vary leads to modifications of these limits; however, there is still a range of dark matter mass and lifetime that is excluded by the IC results.
M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
High Energy Physics
We consider M-theory in the presence of M parallel M5-branes probing a transverse A_{N-1} singularity. This leads to a superconformal theory with (1,0) supersymmetry in six dimensions. We compute the supersymmetric partition function of this theory on a two-torus, with arbitrary supersymmetry preserving twists, using the topological vertex formalism. Alternatively, we show that this can also be obtained by computing the elliptic genus of an orbifold of recently studied M-strings. The resulting 2d theory is a (4,0) supersymmetric quiver gauge theory whose Higgs branch corresponds to strings propagating on the moduli space of SU(N)^(M-1) instantons on R^4 where the right-moving fermions are coupled to a particular bundle.
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
High Energy Physics
We present explicit computations and conjectures for 2 → 2 scattering matrices in large N U(N) Chern-Simons theories coupled to fundamental bosonic or fermionic matter to all orders in the ’t Hooft coupling expansion. The bosonic and fermionic S-matrices map to each other under the recently conjectured Bose-Fermi duality after a level-rank transposition. The S-matrices presented in this paper may be regarded as relativistic generalization of Aharonov-Bohm scattering. They have unusual structural features: they include a non analytic piece localized on forward scattering, and obey modified crossing symmetry rules. We conjecture that these unusual features are properties of S-matrices in all Chern-Simons matter theories. The S-matrix in one of the exchange channels in our paper has an anyonic character; the parameter map of the conjectured Bose-Fermi duality may be derived by equating the anyonic phase in the bosonic and fermionic theories.
New strong interactions and the t t-bar asymmetry

Joachim Brod University of Cincinnati
May 13, 2014

PIRSA:14050092
High Energy Physics
The CDF and D0 experiments at Tevatron measure a top-quark forward-backward
asymmetry significantly larger than the standard-model prediction.
We construct a model that involves new strong interactions at the electroweak scale
and can explain the measured asymmetry. Our model possesses a flavor symmetry
which allows to evade flavor and collider constraints, while it still permits flavor-violating
couplings of order 1 which are needed to generate the asymmetry via light t-channel vectors.

Title	Speaker(s)	Date	Talk Type	Info link
Testing QED with positronium state	Alexander Penin	2014-08-26	Scientific Series	View details
Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation	Anson Hook	2014-07-29	Scientific Series	View details
Supersymmetric AdS5 solutions in M-theory and Class S SCFT's	Ibrahima Bah	2014-07-22	Scientific Series	View details
Exploring N=1 theories of class S through Higgsing, dualizing and twisting	Jaewon Song	2014-07-15	Scientific Series	View details
Improving Mass Measurements Using Many-Body Phase Space	Can Kilic	2014-07-15	Scientific Series	View details
The Exact Renormalization Group and Higher Spin Holography.	Rob Leigh	2014-06-17	Scientific Series	View details
What Can We Learn from Precision Higgs	Maxim Perelstein	2014-06-13	Scientific Series	View details
Gauge fields in de Sitter space: antipodal symmetry and holography	Yasha Neiman	2014-06-03	Scientific Series	View details
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?	Atri Bhattacharya	2014-05-22	Scientific Series	View details
M-strings and their orbifolds	Babak Haghighat	2014-05-20	Scientific Series	View details
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter	Shiraz Minwalla	2014-05-13	Scientific Series	View details
New strong interactions and the t t-bar asymmetry	Joachim Brod	2014-05-13	Scientific Series	View details

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High Energy Physics

Format results

Testing QED with positronium state

Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation

Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Improving Mass Measurements Using Many-Body Phase Space

The Exact Renormalization Group and Higher Spin Holography.

What Can We Learn from Precision Higgs

Gauge fields in de Sitter space: antipodal symmetry and holography

Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

M-strings and their orbifolds

Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

New strong interactions and the t t-bar asymmetry

Testing QED with positronium state

Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation

Supersymmetric AdS5 solutions in M-theory and Class S SCFT's

Exploring N=1 theories of class S through Higgsing, dualizing and twisting

Improving Mass Measurements Using Many-Body Phase Space

The Exact Renormalization Group and Higher Spin Holography.

What Can We Learn from Precision Higgs

Gauge fields in de Sitter space: antipodal symmetry and holography

Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

M-strings and their orbifolds

Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

New strong interactions and the t t-bar asymmetry