Events Archive

IAS HET Seminar | Leonard Susskind, Stanford University| “Observers and Observations in de Sitter Space” | Zoom
Wed, Aug 23, 2023, 1:30 pm1:30 pm

The key word in the title is “IN”. Unlike AdS where observers can be thought of as living on the boundary of space, or even in a laboratory beyond the boundary, in dS the observer is part of the system; he or she lives “in” the de Sitter spacetime. Even worse, observers are mere transient fluctuations that originate on…

HEP Seminar|Swapan Chattopadhyay|UC Berkeley and Fermilab|"Optical Maxwell’s Demon"
Thu, May 18, 2023, 4:00 pm5:00 pm

The technique of “Stochastic Cooling” of phase space of a particle beam, using microwave techniques in the GHz frequency range, has been employed historically in particle colliders, leading to ground-breaking discoveries. ‘Cooling’ increases the probability of interactions in colliding beams, thus enhancing the likelihood of observing rare…

The Standard Model heavyweights: an overview of the latest measurements of the ttW and four-tops processes by the ATLAS experiment|Brendon Bullard
Thu, May 11, 2023, 2:00 pm3:00 pm

Abstract: Measurements of rare Standard Model (SM) processes are now possible thanks to the large trove of collision data delivered by the LHC during its second data taking run. Of particular interest are heavy states including top quarks plus an additional heavy boson (ttH, ttW, and ttZ) and the simultaneous production of four top quarks…

Faculty, post docs, grads
HET Seminar |Yasha Neiman, OIST| “Bulk-local diagrams for higher-spin gravity, using its "BPS black hole" | Jadwin 202& Zoom
Mon, Apr 17, 2023, 2:30 pm3:30 pm

I make a surprising connection between two long-standing problems in higher-spin gravity: (1) locality concerns at the quartic order in perturbation theory, and (2) the physical meaning of the Didenko-Vasiliev "BPS black hole" solution.

I show that the Didenko-Vasiliev solution…

HEP Seminar-Qianshu Lu-Harvard-"Physics at a High Energy Muon Collider"
Mon, Jul 11, 2022, 2:00 pm2:00 pm

 A high energy muon collider is a unique machine that breaks the traditional energy/precision dichotomy. It provides both an unprecedented reach in energy with a compact ring and a clean environment that allows precise measurements. I will provide an overview of the powerful physics potential of a multi-TeV muon collider, starting from its…

HEP Seminar-Caterina Vernieri- Stanford- A "Cool" Route to Unveil the Higgs Boson’s Secrets
Thu, Jun 16, 2022, 2:00 pm2:00 pm

The Higgs boson was discovered in 2012 by the ATLAS and CMS experiments at the world’s most powerful particle collider, the Large Hadron Collider (LHC) in Geneva, Switzerland. This particle plays a unique role in fundamental physics. It gives all of the known elementary particles, including itself, their masses. While we now have a strong…

HEP Seminar- Luca Mastrolorenzo-CERN-"Unveiling the Higgs Boson's Charm with the CMS Experiment"
Thu, Apr 21, 2022, 2:00 pm2:00 pm

Probing the Yukawa couplings is paramount to understand the role played by the Higgs boson in the Standard Model. Ten years after the discovery of the Higgs boson, all the Yukawa couplings to the third generation of fermions have been measured. More recently the CMS and ATLAS collaborations claimed the evidence of the…

HEP Seminar/ Cristian Peña/"Unlocking the CMS Experiment to Catch Long-lived Particles"
Mon, Apr 18, 2022, 2:00 pm2:00 pm

Enabling new long-lived particles (LLPs) searches at the LHC presents HEP research with unique opportunities. Introducing novel experimental techniques to identify and reconstruct LLPs will open up new possibilities for discoveries with striking signatures. I will present new long-lived particles searches, with a focus on the CMS Muon System…

HEP-Dicke Candidate-Kiley Kennedy-Columbia-"Spotlight on Supersymmetry at the LHC: The First ATLAS Search for Displaced and Delayed Diphoton Resonances"
Tue, Nov 30, 2021, 3:30 pm3:30 pm

To date, LHC searches have provided no definitive evidence for physics beyond the Standard Model (BSM). What if we’re looking in the wrong place? Long-lived particles (LLPs) arise from a variety of well-motivated BSM theories. However, they remain weakly constrained at the LHC: most reconstruction algorithms target prompt decays of particles…

High Energy Physics Seminar- Xin Qian-BNL-"Search for an Anomalous Excess in Neutrino-Induced Interactions in the MicroBooNE Liquid Argon Time Projection Chamber"
Thu, Nov 11, 2021, 2:00 pm3:30 pm

   The MicroBooNE experiment was designed primarily to explore the nature of the previously observed low-energy excess in electron neutrino candidates in the MiniBooNE experiment located in the Booster Neutrino Beamline at Fermi National Accelerator Laboratory. Using an 85-ton active volume Liquid Argon Time Projection Chamber (LArTPC) with its…

High Energy Experiment Seminar-Nan Lu -"Recent CMS results on Higgs boson physics and contribution to Snowmass 2021"
Tue, Jan 12, 2021, 2:00 pm2:00 pm


Abstract: After the discovery of the Higgs boson by the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN in 2012, a new era of studying the properties of this newly discovered particle has begun. Precision measurement of the Higgs boson properties is a golden testbench of…

HEE Seminar- Taylor Faucett-UCI-Physics Learning from Machines Learning
Tue, Dec 1, 2020, 2:00 pm2:00 pm

Machine Learning methods are extremely powerful but often function as black-box problem solvers, providing improved performance at the expense of clarity. Our work describes a new machine learning approach which translates the strategy of a deep neural network into simple functions that are meaningful and intelligible to the…

High Energy Experiment Seminar-Stephane Cooperstein UCSD-"First Evidence for Higgs Boson Decay to Muons"
Thu, Oct 15, 2020, 2:00 pm2:00 pm

Abstract: Probing the Higgs boson coupling to the muon is one of the last experimentally accessible frontiers in the direct measurement of Higgs boson couplings at the LHC. This seminar will highlight the first evidence for the rare Higgs boson decay to muons, achieved by the CMS Collaboration using the full dataset collected at 13 TeV during…

HET Seminar | Radu Roiban, Penn State | “Perspectives on the Generally-Relativistic Two-Body Problem from Double Copy & EFT”| Bloomberg Lecture Hall
Mon, Nov 25, 2019, 2:30 pm2:30 pm

While the flat space two-body problem is integrable, the generally-relativistic one is not starting at the next-to-leading order.
In the appropriate classical limit, scattering amplitude-based techniques can yield the classical interaction of massive bodies to all orders in their velocities and to fixed order in…

HET Seminar | Adam Levine, IAS | “On a Quantum Penrose Inequality” | Bloomberg Hall Physics Library
Wed, Nov 20, 2019, 1:45 pm1:45 pm

Description: Suggested reading:
Marc Mars, Present Status of the Penrose Inequality…

HET Seminar | Si Li, IAS; Tsinghua University | “Deforming Holomorphic Chern-Simons at Large N” | Bloomberg Lecture Hall
Fri, Nov 15, 2019, 1:45 pm1:45 pm

We describe the coupling of holomorphic Chern-Simons theory at large N with Kodaira-Spencer gravity. This gives a complete description of open-closed string field theory in the topological B-model. We explain an anomaly cancellation mechanism at all loops in perturbation theory in this model. At one loop this anomaly cancellation is analogous…

HET Seminar | Andrew Turner, MIT | "General F-theory Models with SU(3) x SU(2) x U(1) / Z_6 Symmetry” | Bloomberg Lecture Hall
Mon, Sep 30, 2019, 2:30 pm2:30 pm

We construct a general form for an F-theory Weierstrass model over any base giving a 6D or 4D supergravity theory with gauge group SU(3) x SU(2) x U(1) / Z_6 and associated generic matter. The concept of 'generic matter' can be rigorously defined in 6D supergravity and generalizes naturally to four dimensions for F…

Physics Group at IAS | Greg Moor, Rutgers University | “A brief review of some work on BPS states, wall-crossing, hyperkahler geometry, Hitchin systems, etc.” | Bloomberg Lecture Hall
Wed, Sep 18, 2019, 1:45 pm1:45 pm

This talk will give a brief overview focused on six papers written by D. Gaiotto, G. Moore, and A. Neitzke
loosely centered around the topics mentioned in the title. The papers are on the arXiv.

Background reading:  Some short reviews are:

HET Seminar | Amit Sever, CERN | "The Holographic Dual of Strongly γ-deformed N=4 SYM Theory" | Bloomberg Lecture Hall
Mon, Sep 16, 2019, 2:30 pm2:30 pm

We present a first-principles derivation of a weak-strong duality between the four-dimensional fishnet theory in the planar limit and a discretized string-like model living in AdS5. At strong coupling, the dual description becomes classical and we demonstrate explicitly the classical integrability of the model. We…