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NOV
21
Today
CANCELLED - RIKEN Lunch Seminar
"Shedding light on photon and dilepton spectral functions"
Presented by Greg Jackson, University of Bern
12 pm, Building 510, Room 2-160
Thursday, November 21, 2019, 12:00 pm
Hosted by: Yuta Kikuchi
Photons and dileptons offer themselves as 'clean' probes of the quark-gluon plasma because they are unlikely to reinteract once produced. Their emission rates are given via the vector channel spectral function, an object that can ultimately be reconstructed by analytic continuation of lattice data. To confront perturbative results with that data, the NLO corrections are needed in all domains that affect the associated imaginary-time correlator, namely for energies above, below and in the vicinity of the light cone. We summarize recent progress here and, to control an unavoidable snag, we also determine these corrections for the transverse and longitudinal polarizations separately. Our results should help to scrutinize direct spectral reconstruction attempts from lattice QCD.
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NOV
21
Today
Particle Physics Seminar
Presented by Stefano Zambito, Harvard University
3 pm, Small Seminar Room, Bldg. 510
Thursday, November 21, 2019, 3:00 pm
Hosted by: Viviana Cavaliere
"After the discovery of the Higgs Boson, the predictions of the Standard Model of particle physics can be extrapolated without inconsistencies all the way up to the Planck mass. Despite this tremendous success, we still remain in the dark about many open puzzles. Why is the weak interaction much stronger than gravity? What is the nature of Dark Matter? Are the strong, weak and electromagnetic forces a lower-energy manifestation of one single fundamental interaction? A possible solution to these questions is provided by Supersymmetry. The key assumption behind many natural supersymmetric models is that the masses of the gluinos, the top squarks and the higgsinos are near the TeV scale, thus within the LHC reach. In this presentation, I will introduce some of the theoretical and phenomenological arguments that motivate the quest for Supersymmetry. I will then outline how I searched for the above-mentioned particles using LHC Run-2 data collected by the ATLAS experiment. Finally, I will focus on my vision of the future and my research plans in high-energy experimental physics."
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NOV
22
Friday
Center for Functional Nanomaterials Seminar
"Chiplet Micro-Assembly Printer – A New Nano Integration Tool"
Presented by Eugene Chow, Electronic Materials and Devices Laboratory at PARC (a Xerox Company)
10 am, Bldg. 735, Conference Room A, 1st Floor
Friday, November 22, 2019, 10:00 am
Hosted by: Chuck Black
While lithography was a key technology for making transistors into complex integrated circuits, micro-assembly is potentially a key technology for making nanotechnology into large, complex, heterogeneous, custom systems. The vast majority of semiconductor and materials research will never be integrated into mainstream clean room fabs – assembly is the general solution for heterogeneous integration. We aim to build a new tool for integrating millions of pre-fabricated chiplets or micro-objects into systems, based on deterministic micro-assembly and transfer. The process uses chips initially in solution, and then sorts, transports, and orients chips with directed electrostatic assembly and parallel control. Assemblies are then transferred to final substrates with a stamp or continuous feed roll-based methods, and then electrically interconnected. The current laboratory systems have handled small chips (10 um – 500 um), demonstrated fine registration (
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NOV
26
Tuesday
Physics Colloquium
"A High Energy High-Luminosity Electron-Positron Collider using Energy Recovery Linacs"
Presented by Thomas Roser, Brookhaven National Laboratory
3:30 pm, Large Seminar Room, Bldg. 510
Tuesday, November 26, 2019, 3:30 pm
Hosted by: Dmitri Denisov / George Redlinger
I will present an alternative approach for a high-energy high-luminosity electron-positron collider. Present designs for high-energy electron-positron colliders are either based on two storage rings with 100 km circumference with a maximum CM energy of 365 GeV or two large linear accelerators with a high energy reach but lower luminosity, especially at the lower initial CM energies. A collider based on storage rings has a high electric power consumption required to compensate for the beam energy losses from the 100 MW of synchrotron radiation power. Using an Energy Recovery Linac (ERL) located in the same-size 100 km tunnel would greatly reduce the beam energy losses while providing higher luminosity in this high-energy collider. Furthermore, this approach could allow for colliding fully polarized electron and positron beams and for extending the CM energy to 600 GeV, which would enable double-Higgs production and the production and measurements of the top Yukawa coupling.
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DEC
2
Monday
Special Physics Colloquium
"FCC-ee at CERN: High Precision and High Luminosity at the Electroweak Scale"
Presented by Alain Blondel, CERN and University of Geneva
11 am, Large Seminar Room, Bldg. 510
Monday, December 2, 2019, 11:00 am
Hosted by: George Redlinger
The discovery of the Higgs boson competed the Standard model. Particle physics enters a new era, in which new phenomena are required, but at unknown energy scale and coupling strength. This requires a broad program of searches. The broadest program is offered by the Future Circular Collider (FCC) project at CERN, with a ultimate goal of reaching > 100 TeV in pp collisions. The first step of this program is a circular e+e- collider, offering unprecedented levels or precision and sensitivity to feebly coupled particles.
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DEC
3
Tuesday
Physics Colloquium
"The First Stage of the International Linear Collider"
Presented by James Brau, University of Oregon
3:30 pm, Large Seminar Room, Bldg. 510
Tuesday, December 3, 2019, 3:30 pm
Hosted by: George Redlinger
The International Linear Collider is now proposed to begin with a first stage at 250 GeV with an initial integrated luminosity goal of 2 ab−1. I will review the plan for the collider and detectors, the key physics expectations, and recent international discussions. The key physics goal of the ILC250 is precision measurements of the Higgs boson couplings. The exceptional precision of model-independent measurements of all major decay modes makes this program sensitive to possible anomalies due to new physics beyond the Standard Model. Other physics goals will be addressed briefly. The ILC250 infrastructure will support an upgrade future of experiments with e+e− collisions at higher energy up to 1 TeV, building on the success of the first 250 GeV stage.
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DEC
4
Wednesday
HET Seminar
"Composite Higgs Models at the LHC and beyond"
Presented by Da Liu, UCDavis
2:30 pm, Small Seminar Room, Bldg. 510
Wednesday, December 4, 2019, 2:30 pm
Hosted by: Peter Denton
Compositeness is an elegant way to address the hierarchy problem. In this talk, I will discuss about the phenomenology of the composite Higgs models at the LHC and beyond, in which Higgs arise as Nambu-Goldstone bosons. Under broad assumption of partial compositeness and symmetry breaking pattern, I will discuss about phenomenology of the spin-1 resonances and the top partners and the relevance of their strong interactions in the searches at the LHC. In addition to the direct searches, the LHC has become a precision machine with accumulating enormous data at the High-Luminosity (HL) stage. I will discuss about precision measurement in the di-boson processes and their relevance in the different new physics patterns. Meanwhile, I will talk about the strong multi-pole interaction scenario, in which the transverse SM gauge bosons are also belonging to the strong sector at the multi-TeV scale. This provided a strong motivation for the precision measurement at the LHC. Finally, I will briefly discuss about the universal relationship between the Higgs couplings predicted by the non-linearity and their phenomenological relevance.
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DEC
4
Wednesday
CSI Q Seminar
"Quantum supremacy using a programmable superconducting processor"
Presented by Pedram Roushan, Google
3 pm, Training Room, Bldg 725
Wednesday, December 4, 2019, 3:00 pm
Hosted by: Layla Hormozi
The promise of quantum computers is that certain computational tasks might be executed exponentially faster on a quantum processor than on a classical processor1. A fundamental challenge is to build a high-fidelity processor capable of running quantum algorithms in an exponentially large computational space. Here we report the use of a processor with programmable superconducting qubits to create quantum states on 53 qubits, corresponding to a computational state-space of dimension 2^53. Measurements from repeated experiments sample the resulting probability distribution, which we verify using classical simulations. Our Sycamore processor takes about 200 seconds to sample one instance of a quantum circuit a million times—our benchmarks currently indicate that the equivalent task for a state-of-the-art classical supercomputer would take approximately 10,000 years. This dramatic increase in speed compared to all known classical algorithms is an experimental realization of quantum supremacy for this specific computational task, heralding a much-anticipated computing paradigm.
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DEC
5
Thursday
Particle Physics Seminar
"A New Paradigm for Dark Matter Search at the LHC"
Presented by Yangyang Cheng, Cornell University
3 pm, Small Seminar Room, Bldg. 510
Thursday, December 5, 2019, 3:00 pm
Hosted by: Ketevi Assamagan
The existence of dark matter (DM), through astrophysical and cosmological observations, presents some of the most striking evidence of physics beyond the Standard Model. Stringent limits have been placed on DM as a Weakly Interacting Massive Particle (WIMP) from direct and indirection detection as well as collider experiments. If instead of one type of DM particle, nature contains a complex dark sector, the new hidden particles can evade existing DM limits and most direct detection experiments, but may be produced at high-energy colliders like the LHC. Many dark sector models predict long-lived particles with striking collider signature, opening an exciting new paradigm for dark matter search. This talk overviews the landscape for dark matter search, and introduces the physics motivation for a complex dark sector with long-lived particles. It then describes two types of signature-driven dark sector searches at the CMS experiment, for a dark shower and for displaced lepton jets. Finally, the talk discusses prospects for dark sector searches at the High-Luminosity LHC with detector and trigger upgrades, in particular how the new forward detectors and enhanced timing capabilities can reach new phase spaces and sensitivities.
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DEC
5
Thursday
CFN Colloquium
"Looking at Silicates Through the Eyes of Surface Science: A Story of Struggle, Incompatibility, Compromise, Hope, ... and Curiosities"
Presented by Dr. J. Anibal Boscoboinik, Brookhaven National Laboratory, Center for Functional Nanomaterials
4 pm, CFN, Bldg 735, Seminar Room, 2nd Floor
Thursday, December 5, 2019, 4:00 pm
Hosted by: Deyu Lu
Silicates are the most abundant materials in the earth's crust and are tremendously important in numerous applications. In catalysis, for example, they can be used as supports for active species, or as catalysts themselves in the case of their crystalline nanoporous Al-doped versions (a.k.a.: zeolites). While surface science techniques provide exquisite levels of chemical and electronic detail, this approach struggles with non-conductive materials like silicates due to their incompatibility with methods that require electron conductivity. A way to reach a compromise between the world of silicates and the world of surface science is to use ultra-thin films supported on conductive supports, which gives us hope to truly reach a detailed understanding of these materials. In this talk, I will discuss the work we are doing at the Center for Functional Nanomaterials in trying to understand silicates and zeolites, and I will often diverge into "curiosities" we found along the way. Most notably, confinement effects at the silicate/metal interface have resulted in fascinating properties far beyond our expectations.
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DEC
18
Wednesday
CSI Q Seminar
"Probing quantum entanglement at the Electron Ion Collider"
Presented by Dmitri Kharzeev, Stony Brook University and BNL
3 pm, Training Room, Bldg 725
Wednesday, December 18, 2019, 3:00 pm
Hosted by: Layla Hormozi
The structure functions measured in deep-inelastic scattering are related to the entropy of entanglement between the region probed by the virtual photon and the rest of the hadron. This opens new possibilities for experimental and theoretical studies using the Electron Ion Collider. The real-time evolution of the final state in deep-inelastic scattering can be addressed with quantum simulations using the duality between high energy QCD and the Heisenberg spin chain.
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JAN
23
Thursday
Brookhaven Women in Science Speaker
"Enrico Fermi: Voyage to a New World"
Ed Sierra, Long Island Chapter of the American Nuclear Society
4 pm, Large Seminar Room, Bldg. 510
Thursday, January 23, 2020, 4:00 pm
Enrico Fermi, born in September 1901, was an Italian and naturalized-American-physicist and a husband, father, and one of the world's most brilliant and productive scientists. In 1938 he was awarded the Nobel Prize in Physics for his demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons. In January, 1939, after receiving the Nobel Prize he moved to Columbia University and eventually the University of Chicago where he led the first nuclear chain reaction. Ed works in the Quality Management Office at BNL as the Laboratory Compliance Officer. He is currently serving his fourth term as President of the Long Island Chapter of the American Nuclear Society.
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FEB
13
Thursday
Environmental & Climate Sciences Department Seminar
"Tropical Deep Convection and Entrainment in Idealized Cloud-Resolving Models"
Presented by Usama Anber, Environmental & Climate Sciences Dept (BNL)
11 am, Large Conference Room, Bldg. 490
Thursday, February 13, 2020, 11:00 am
Hosted by: Mike Jensen
Global Climate Models (GCMs) are depicted as the holy grail of climate science. However, they are far from reliably simulating the current and future climate. One of the components that represents a source of errors and biases in these models is the convective parametrization scheme and the ad-hoc treatment of deep convection and entrainment. In this talk, I will focus on two tropical atmospheric events that GCMs struggle to simulate: Amazonian deep precipitating convection, and the Madden Julian Oscillations. I will present how idealized cloud-resolving models (CRMs) coupled with simulated and forced large-scale circulation can capture the essential dynamics of these events. In particular, when diagnosed from the CRMs, I will show that entrainment is merely a response to the convective regime and cannot have a constant rate as GCMs suggest. If time allows, I will also point out to another potential source of biases in the simulated mean climate stemming from the representation of numerical noise damping in the model dynamical core.
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APR
16
Thursday
Environmental & Climate Sciences Department Seminar
"Non-Equilibrium Aerosol Dynamics across Length Scales: Addressing a Few Contemporary Challenges"
Presented by Rajan Chakrabarty, Washington University, St. Louis
11 am, Large Conference Room, Bldg. 490
Thursday, April 16, 2020, 11:00 am
Hosted by: Ernie Lewis
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APR
23
Thursday
Environmental & Climate Sciences Department Seminar
"Emergence of a New Chemical Regime at Whiteface Mountain: Growing Abundance of Water Soluble Organics in Cloud Water associated with a Growing Ion Imbalance"
Presented by Sara Lance, SUNY Albany
11 am, Large Conference Room, Bldg. 490
Thursday, April 23, 2020, 11:00 am
Hosted by: Ernie Lewis
