LBNL Physics Division Research Progress Meetings

Joint Special RPM and INPA Seminar | Chelsea Bartram (U of Washington) "Combing the Cosmos: A Deep Dive into the Nature of (Dark) Matter and Fundamental Symmetries"
2022-03-04 12:00 - 13:00 UTC | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
One of the most striking mysteries in modern astrophysics manifests itself as an absence of matter needed to form a narrative consistent with our current understanding of the universe. A promising candidate for the so-called “dark matter” is the axion, whose wave-like nature requires unique technology to detect. The Axion Dark Matter eXperiment (ADMX) leverages the inverse Primakoff effect to search for axions using an ultra-low noise receiver chain and microwave cavity in a strong magnetic field. If discovered, the axion could not only solve the dark matter problem but also resolve the Strong CP problem. Fundamental symmetries have been at the center of many deep astrophysical questions. As such, they have served as a driving force behind my research, motivating my graduate search for CP- and CPT-violation in the lepton sector, as well as my post-doctoral work in axion dark matter. I present my prior research and explain how it fits into my larger ambition to understand the large-scale structure and composition of the universe with CMB-S4.
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Kevin Crowley (UCB) "The View From Down Here: Ground-Based Measurements of the Cosmic Microwave Background from the Atacama Desert"
2022-03-10 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:

The study of the Cosmic Microwave Background (CMB) anisotropies has become a percent-level science constraining the accepted cosmological model ΛCDM. The most powerful measurements thus far have been made from space, but observations from the Earth’s surface can be made at higher resolution, with higher detector count, and with iterative upgrades to the instruments. One key goal of recent upgrades has been recovering the large angular-scale polarization signal that could reveal the signature of inflation in the early universe. The current generation of ground-based telescopes have developed new technologies, including polarization-modulator systems, kilopixel focal plane arrays, and highly-multiplexed detector readout, all with the goal of enabling sensitivity while controlling systematic errors in the challenging environment of polarization measurements under the atmosphere. In this talk, I will describe my efforts in these areas of instrumentation development and my experiences pushing for sensitivity while pondering just what lies below the noise in CMB experiments observing from the Atacama Desert. I will also highlight the ways that future experiments, including the under-construction Simons Observatory and the exciting prospect of CMB-S4, will lay a path toward the ultimate goal of fully exploring the physics in the CMB from terra firma.
http://physics.lbl.gov/rpm/index.php/events/If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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Roger O'Brient (U. Washington) "Superconducting Detectors for Cosmology and Ultra-High Energy Physics"
2022-03-17 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The BICEP program has thus far constrained the tensor scalar ratio r<0.036, approaching the gravitational lensing floor. This was possible in large part because of innovations in detector technology at JPL. In my talk, I will describe the antenna-coupled TES bolometers used in BICEP and how JPL as played this vital role in the project. I’ll provide some context of how they fit into similar technologies from peer institutions, and how some of the lessons learned in BICEP may be transferable to CMB S4. Finally, I’ll describe how the next generation of resonator-based detectors will enable future missions and experiments in far-IR and millimeter wave astrophysics.

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Kelly Johnson, Talent Outreach Program Manager (LBNL) "Talent Outreach Program 101"
2022-03-24 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
Kelly Johnson, Talent Outreach Program Manager, will share details about the Talent Outreach Program Office, including the various hiring and outreach programs for adult workers from underrepresented groups (women, minorities, veterans, and individuals with disabilities) that are available to the lab community. She will also provide the physics division with some suggested topics to consider when engaging/interviewing/hosting interns from these groups.

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Kaori Fuyuto (LANL) "A Cross-Frontier Quest to Reveal the Origin of the Universe"
2022-03-29 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:

The Standard Model (SM) is the most well-tested theory of elementary particles that make up the known Universe. However, there are still some major puzzles that cannot be accounted for by the SM in our Universe, e.g., matter-antimatter asymmetry of the Universe and the origin of neutrino mass. Solving these puzzles require physics beyond the SM (BSM), which is searched for in a variety of frontiers today. In this talk, I will discuss how BSM physics, which could provide solutions to the above mysteries, can be probed at both energy and intensity frontiers, i.e., the Higgs coupling measurements in collider experiments and LFV searches at the Electron-Ion Collider.

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TBA
2022-03-31 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
TBA

http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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Nicholas Rodd (CERN) "Looking Beyond Dark Matter in Axion Haloscopes"
2022-04-05 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:
The coming decade will bring dramatic improvement in the axion dark-matter program as new experimental designs move beyond the proof of principle stage. In this talk I will outline two signals beyond dark matter that these instruments could discover. The first is a population of relativistic axions that were produced in the early universe and persist as a residual Cosmic axion Background (CaB). The second is high-frequency gravitational waves; I will outline how exploiting an analogy between axion and gravitational-wave electrodynamics allows for axion haloscopes to be converted into gravitational-wave telescopes.

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Gustavo Marques Tavares (UMD) "Dark Sector Signals from Extreme Astrophysical Environments"
2022-04-07 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:
Dark sectors are well motivated extensions of the Standard Model that can address many of the most important open questions in particle physics, such as the particle nature of dark matter, origin of neutrino masses, and the Higgs hierarchy problem. In many scenarios, the interactions between the dark sector and the standard model can be very small. For extremely weak interactions, the best strategy to search for these new states is to look for their signature in extreme astrophysical environments, such as core-collapse supernovae and neutron star mergers. In this talk, I will present new signatures that can be used to search for stable and unstable dark sector particles in extreme astrophysical systems, covering a wide range of parameter space for masses in the MeV-GeV range.
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Ashutosh Kotwal (Duke University) "High Precision Measurement of the W-Boson Mass with the CDF II Detector"
2022-04-11 14:00 - 15:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
***This Research Progress Meeting is scheduled to be a Zoom Talk. Below, please find the Zoom Meeting information to join the talk.***
Lawrence Berkeley National Laboratory
Physics Division
Special Research Progress Meeting
Monday, April 11, 2022
ZOOM Talk: https://lbnl.zoom.us/j/99540518328

VIRTUAL VIEWING IN 50A-5132
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Speaker: Ashutosh Kotwal (Duke University)

Title: High Precision Measurement of the W-Boson Mass with the CDF II Detector
Abstract:TBA
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Pier Monni (CERN) "Taming the Complex Dynamics of Scattering Events"
2022-04-11 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:

The pioneering investigation of the fundamental laws of nature at the Large Hadron Collider builds upon the interpretation ofcomplex scattering events. Our ability to identify small signals of elusive new phenomena therefore depends on accurate theoretical simulations which describe the evolution of the system from the few
produced in the high-energy scattering to the tens or hundreds of low-energy particles observed in the experimental detectors. In this talk, I will discuss the main theoretical technology behind this endeavour, that of event generators. I will present a number of recent theoretical innovations that will shape the creation of a new generation of tools, essential to achieve the outstanding accuracy demanded by collider experiments.

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Ran Itay (SLAC) "MicroBooNE's New Results from the Deep-Learning-Based Search for an Electron Neutrino Excess"
2022-04-19 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
ABSTRACT:
The MicroBooNE detector is a liquid argon time projection chamber (LArTPC) located on-axis in the Booster Neutrino Beam (BNB) at Fermi National Laboratory. One of the primary goals of the experiment is to investigate the excess over background expectations of electromagnetic-like events observed by MiniBooNE at low energies. In this talk, I will present the latest results from MicroBooNe’s four analyses, with a focus on the 2-body CCQE search, which utilizes deep learning and traditional techniques.

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──────────

Željko Ivezić (Rubin Observatory/University of Washington) "Cosmology with the Greatest Movie of All Time”
2022-04-28 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:

The Legacy Survey of Space and Time (LSST), the first project to be undertaken
at the new Vera C. Rubin Observatory, will be the most comprehensive optical
astronomical survey ever undertaken. Starting in 2024, Rubin Observatory will
obtain panoramic images covering the sky visible from its location in Chile
every clear night for ten years. The resulting hundreds of petabytes of imaging
data, essentially a digital color movie of the night sky, will include about
40 billion stars and galaxies, and will be used for investigations ranging
from cataloging dangerous near-Earth asteroids to fundamental physics such as
characterization of dark matter and dark energy. I will start the presentation
with an overview of LSST science drivers and system design, and continue with
a construction status report for the Rubin Observatory. I will conclude with a brief
discussion of synergies between Rubin, Euclid, and Roman Space Telescope.

http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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Ken Bloom (UNL) "Climate Impacts of Particle Physics: A Sustainability Agenda"
2022-05-17 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
ABSTRACT: (This is a Hybrid/ZOOM Meeting)
The pursuit of particle physics requires a stable and prosperous society. Today, our society is increasingly threatened by global climate change. Human-influenced climate change has already impacted weather patterns, and global warming will only increase unless deep reductions in emissions of CO2 and other greenhouse gases are achieved. Current and future activities in particle physics need to be considered in this context, either on the moral ground that we have a responsibility to leave a habitable planet to future generations or on the more practical ground that, because of their scale, particle physics projects and activities will be under scrutiny for their impact on the climate. I will discuss a white paper for the Snowmass workshop that I co-authored, in which we considered several contexts in which the practice of particle physics has impacts on the climate.

──────────

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Conference Room Location: 50-5132 at 4:00 PM – TODAY
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──────────

HYBRID TALK | David Weinberg (Ohio State U./Visiting UCB Miller Professor) "Decoding the Origin of the Elements"
2022-05-31 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:

The elemental abundance patterns of stars encode a wealth of information about the history of the Milky Way galaxy and the astrophysical processesthat create atomic nuclei. I will describe some of what we have learned about the origin of elements in the Milky Way from the SDSS APOGEE survey, which has measured detailed abundance patterns (typically 15-18 elements
per star) for half a million stars. The average chemical enrichment and the relative contributions from core collapse (massive star) supernovae and Type Ia (white dwarf) supernovae changes systematically with position in the Galaxy. However, the observed median trends of element abundance ratios are nearly independent of position, and the abundance pattern of
a typical APOGEE star can be described with two free parameters and residuals at the few-percent level. By isolating the enrichment pattern of core collapse supernovae we can test theoretical models of massive star evolution and black hole formation. Other elements such as nitrogen and cerium provide clues to the mixing of nuclear-processed material within intermediate mass stars. The most important degeneracy in Galactic chemical evolution models is the tradeoff between the overall yield of heavy elements (sensitive to black hole formation) and the ejection of elements in galactic winds. Measurement of deuterium and helium-3 can help break this degeneracy because these isotopes originate primarily or entirely in the big bang.

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──────────

Anne Green (University of Nottingham) "Primordial Black Holes as a Dark Matter Candidate"
2022-06-16 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
Diverse astrophysical and cosmological observations indicate that most of the matter in the Universe is cold, dark and non-baryonic. Traditionally the most popular dark matter candidates have been new elementary particles, such as WIMPs and axions. However Primordial Black Holes (PBHs), black holes formed from over densities in the early Universe, are another possibility. The discovery of gravitational waves from mergers of ~10 Solar mass black hole binaries by LIGO-Virgo has generated a surge in interest in PBH dark matter. I will overview the formation of PBHs, the observational limits on their abundance and the key open questions in the field.
http://physics.lbl.gov/rpm/index.php/events/

Matt Kramer (LBNL) - "Measurement of sin²2θ₁₃ and Δm²ₑₑ from the Full Dataset of the Daya Bay Experiment"
2022-06-30 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
ABSTRACT: (This is a Hybrid/ZOOM Meeting)
The Daya Bay Reactor Neutrino Experiment was built to measure the smallest neutrino mixing angle, θ₁₃, using the oscillation of electron antineutrinos produced by the Daya Bay nuclear power complex in southern China. Using the rate and spectral shape of antineutrino events at multiple baselines from the reactors, sin²2θ₁₃ is extracted along with the effective mass splitting Δm²ₑₑ. This talk describes, step-by-step, the latest oscillation analysis from our full dataset of ~5.5 million antineutrinos acquired over nearly a decade. In addition to the increase in statistics, this analysis benefits from improvements in energy reconstruction and background subtraction. With an uncertainty of 2.8%, this measurement of sin²2θ₁₃ is likely to remain the world’s most precise for the foreseeable future.

ZOOM Talk: https://lbnl.zoom.us/j/91782268585
Time: 4:00 PM

Hybrid Location: Conference Room Location: 50-5132

Hybrid Talk | Aaron Manalaysay (LBNL) "First results from the LZ dark matter search"
2022-07-14 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:
The question of what the identity of dark matter is, presents one of the most fundamental mysteries in physics today. An answer to this question will shed light on a wealth of physics beyond the Standard Model, and will have a fundamental impact on our understanding of the universe from the smallest to the largest scales. A global experimental effort has been ongoing for almost forty years to directly detect dark matter in the laboratory, and devices utilizing liquid xenon (LXe) have emerged as the leading technology in this search. LUX-ZEPLIN is the largest and most sensitive LXe dark-matter experiment to ever be constructed, and has been many years in the making. Completing the final construction and commissioning tasks in the depths of the COVID lockdown, LZ has finally turned on and collected its first science data. An exciting glimpse of what is yet to come, I will present these first data and what they tell us about dark matter so far.

http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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Samir Gambhir and Stephen Menendian, UCB - The Inclusiveness Index
2022-07-28 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
The Physics IDEA Committee has invited Samir Gambhir, Director of the Equity Metrics Program, and Stephen Menendian, Assistant Director, members of the Othering & Belonging Institute, University of California, Berkeley, will present their findings on the Inclusiveness Index. They have ranked every US state (and 133 countries) by their levels of inclusion.
The Inclusiveness Index examines inclusivity in terms of race, religion, gender (sex), sexual orientation, and disability, among other social groups using several measures. These include outgroup violence; political representation; income inequality; anti-discrimination laws; rates of incarceration; and immigration/asylum policies.
This will be an LBNL Hybrid Event:
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David Dunsky (LBNL) "Dark Radiation Constraints on Heavy QCD Axion Theories"
2022-08-11 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract: The explicit breaking of the PQ symmetry by higher dimensional operators can spoil the dynamical relaxation of the strong CP angle to its minimum of zero. One solution to this PQ “quality problem” is to introduce heavy QCD axions. Such axions acquire a mass from physics occurring far above the QCD scale and possess a potential more robust to corrections from higher dimensional PQ breaking operators. However, in much of the (m_a, f_a) plane, heavy QCD axions can generate large amounts of dark radiation when decaying. In this talk, I will discuss the cosmological evolution of heavy QCD axions in the early Universe, their interactions with the Standard Model thermal bath, and precise dark radiation constraints arising from their decays. In addition, I will discuss how including a mirror photon – common in heavy axion theories involving mirror QCD sectors – modifies this picture and can lead to dangerous amounts of dark radiation

Bibhushan Shakya (DESY) - "Gravitational Wave Probes of the Dark Universe"
2022-08-30 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
ABSTRACT: (This is a Hybrid/ZOOM Meeting)

Gravitational waves offer a powerful probe of early Universe phenomena. A particularly well-motivated BSM target for gravitational wave experiments is a first order phase transition in a dark sector, where bubbles of true vacuum nucleate and expand in a background of false vacuum. We will discuss several new ideas related to gravitational wave signals from such dark phase transitions, including novel forms of gravitational wave signals beyond the traditionally studied ones sourced by bubble collisions and sound waves, as well as prospects of detecting phase transitions that could have been responsible for the production of dark matter through various nonthermal mechanisms.

Join Zoom Meeting:
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Time: 4:00 PM

Conference Room Location: 50-5132

Bibhushan Shakya (DESY) Webpage: https://sites.google.com/view/bibhushan-shakya

SPECIAL RPM - Physics Division | How to Land a Faculty Position: A Panel Discussion with Senior Scientists in the Physics Division
2022-10-13 16:00 - 17:00 | 50-Auditorium
In this panel discussion postdocs and students will have the opportunity to ask senior division scientists about how the faculty hiring process typically works and labs and universities, and how to put together a winning faculty application. The panelists will be
Nathalie Palanque-Delabrouille (Division director)
Christian Bauer (Theory)
Marjorie Shapiro (ATLAS)
Dave Brown (Mu2e)
Peter Sorensen (LZ)
Together they have about a century worth of experience with hiring panels, in a variety of fields and settings (universities + laboratories). Most of the time will be reserved for interactions with the audience, so bring along all your questions about finding permanent positions in academia
http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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──────────

Simone Pagan Griso (LBNL) "Snowmass Reports Highlights - Part 1"
2022-10-18 16:00 - 17:00 | ca
Abstract:
The Particle Physics Community Planning Exercise (a.k.a. “Snowmass”) is organized by the Division of Particles and Fields (DPF) of the American Physical Society. Snowmass is a scientific study. It provides an opportunity for the entire particle physics community to come together to identify and document a scientific vision for the future of particle physics in the U.S. and its international partners. Snowmass will define the most important questions for the field of particle physics and identify promising opportunities to address them.

The Snowmass exercise is now approaching its end, with most groups’ reports now available from the website (https://snowmass21.org/start).

In this seminar series, we’ll review the most important messages coming out from these reports in a set of brief talks, with ample time for questions.

This week we’ll have a brief introduction, followed by the highlights of the Energy, Accelerator and Computing frontiers given, respectively, by Simone Pagan Griso, Stephen Gourlay and Benjamin Nachman.

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James Unwin (UIC) "The Prospect of Nearby Primordial Black Holes"
2022-10-20 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:
Primordial Black Holes are a potential candidate for explaining some, or even all, of the experimentally inferred dark matter abundance. In this talk I will motivate the existence of Primordial Black Holes and discuss their potential role as a dark matter candidate. Notably, for light Primordial Black Holes there could be a large abundance of such objects in the vicinity of the solar system potentially leading to distinct astrophysical signals. Moreover, I will highlight that one can explain gravitational anomalies observed in small bodies with orbits beyond Neptune, which have been taken to be indicative of a large ninth planet in the outer Solar System, can be explained by a planetary mass Primordial Black Hole which has been gravitationally captured by the Sun.

http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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SPEAKERS: Gabriel Orebi-Gann, Simone Ferraro, & Kevin Lesko - Snowmass Report Highlights - Part 2
2022-10-25 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
ZOOM Information:
Join Zoom Meeting
https://lbnl.zoom.us/j/94367647939?pwd=[REDACTED]
Meeting ID: 943 6764 7939
Passcode: [REDACTED]
This is a HYBRID Meeting
Sessler Conference Room: 50A-5132
Abstract:
The Particle Physics Community Planning Exercise (a.k.a. “Snowmass”) is organized by the Division of Particles and Fields (DPF) of the American Physical Society. Snowmass is a scientific study. It provides an opportunity for the entire particle physics community to come together to identify and document a scientific vision for the future of particle physics in the U.S. and its international partners. Snowmass will define the most important questions for the field of particle physics and identify promising opportunities to address them.
The Snowmass exercise is now approaching its end, with most groups’ reports now available from the website (https://snowmass21.org/start).
In this seminar series, we’ll review the most important messages coming out from these reports in a set of brief talks, with ample time for questions.
This week we’ll have highlights of the Neutrino, Cosmic and Underground Facilities, and Cosmic frontiers presented, respectively, by Gabriel Orebi-Gann, Simone Ferraro, and Kevin Lesko.

HYBRID TALK | Mengjiao Xiao (MIT) "In Search of Cosmic-Ray Antinuclei from Dark Matter with the GAPS Experiment"
2022-10-27 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract:
The origin of dark matter is a driving question of modern physics. Finding dark matter in the laboratory and elucidating its properties could revolutionize our understanding of the fundamental building blocks of the universe. The common challenges for dark matter searches in astrophysical signatures are large and uncertain backgrounds. The General Antiparticle Spectrometer (GAPS) is a balloon-borne experiment designed to identify low-energy cosmic antinuclei, in particular antideuterons from dark matter annihilation or decay, using the uniquely characterized atomic X-rays and charged particles from the decay of exotic atoms. With such a novel detection approach, benefitting from a custom- d eveloped large- area silicon tracker and a large-acceptance Time-of-Flight system, GAPS is sensitive to antideuterons and even antiheliums with the kinetic energy ≤0.25 GeV/n, which should offer an essentially background-free region to probe many generic dark matter models. Additionally, GAPS will collect a high-statistics antiproton spectrum in an unexplored energy range, and open a sensitivity to cosmic antihelium.
The GAPS instrument consists of a tracker of >1000 custom Si(Li) detectors; a precision- timing, large-area time-of-flight system; and a novel oscillating heat pipe thermal system. GAPS is currently under integration and preparing for the first Antarctic balloon flight in late 2023 while two follow-up flights are planned. This talk will present the science impact of the GAPS experiment, while focusing on its custom-developed instrument technology, including the design principle, commissioning of the GAPS functional prototype, integration and testing of GAPS full payload, and the path forward to the initial flight.

http://physics.lbl.gov/rpm/index.php/events/
If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
──────────
Troy Cortez is inviting you to a scheduled Zoom meeting.
Join Zoom Meeting
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Meeting ID: 917 8226 8585
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Dial by your location
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+1 346 248 7799 US (Houston)
+1 253 215 8782 US (Tacoma)
+1 646 558 8656 US (New York)
+1 301 715 8592 US (Germantown)
+1 312 626 6799 US (Chicago)
Meeting ID: 917 8226 8585
Find your local number: https://lbnl.zoom.us/u/abeLb1T4q1
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91782268585@zoomcrc.com
Join by H.323
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162.255.36.11 (US East)
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115.114.115.7 (India Hyderabad)
213.19.144.110 (EMEA)
103.122.166.55 (Australia)
64.211.144.160 (Brazil)
69.174.57.160 (Canada)
207.226.132.110 (Japan)
Meeting ID: 917 8226 8585

HYBRID TALK| Hee-Jong Seo "Accelerating Universe through DESI"
2022-11-03 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
Abstract
One of the most intriguing questions in physics today is the nature of dark energy that is responsible for the accelerated expansion of the Universe. Three-dimensional maps of galaxies from spectroscopic galaxy surveys provide a giant laboratory to test the nature of the Universe, including dark energy, in a way that is complementary to other cosmic surveys. DESI, being the largest galaxy redshift survey up to date, is currently preparing for the first-year cosmology analysis release in Summer 2023, In this talk, among the key science goals of DESI, I want to focus on the studies of two accelerated expansion phases of the Universe using DESI, one today due to dark energy and the other, cosmic inflation right after the Big Bang. For the former, I will show the first Baryon Acoustic Oscillation detection result using only the first two months of the DESI data. For the latter, I will discuss how we can fight the observational systematics using neural networks and derive a tight constraint on inflation using the DESI Legacy survey.

SPEAKER: Simone Pagan-Griso - Snowmass Report Highlights - Part 3
2022-11-08 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
TITLE: Snowmass Report Highlights – Part 3
SPEAKERS: This week, we’ll have highlights of the Theory, Rare-Processes and Precision, and Community Engagement Frontiers, presented respectively by the following:

Simon Knapen – Theory Frontier
Dave Brown – Rare-Processes and Precision Frontier
Erin Hansen – Community Engagement Frontier

ABSTRACT: The Particle Physics Community Planning Exercise (a.k.a. “Snowmass”) is organized by the Division of Particles and Fields (DPF) of the American Physical Society. Snowmass is a scientific study. It provides an opportunity for the entire particle physics community to come together to identify and document a scientific vision for the future of particle physics in the U.S. and its international partners. Snowmass will define the most important questions for the field of particle physics and identify promising opportunities to address them.
The Snowmass exercise is now approaching its end, with most groups’ reports now available from the website (https://snowmass21.org/start).
In this seminar series, we’ll review the most important messages coming out from these reports in a set of brief talks, with ample time for questions.
This week we’ll have highlights of the Neutrino, Cosmic and Underground Facilities, and Cosmic frontiers presented, respectively, by Simon Knapen, Dave Brown, Erin Hansen.

Location: 50A-5132
Time: 4:00 – 5:00 PM
Title: “Snowmass Report Highlights – Part 3”

ZOOM Information:
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SPEAKER - Edward Callaghan - (UCB) - Optical Neutrino Detectors of the Past, Present, and Future
2022-11-10 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
TITLE: Optical Neutrino Detectors of the Past, Present, and Future
ABSTRACT: Large-volume optical detectors are a mainstay of experimental
neutrino physics, with several successful implementations in the past
decades and larger models on the horizon. Traditionally, such detectors
make use of either Cherenkov radiation, produced as a superluminal
charged particle stops, or scintillation light, produced from the
deexcitation of excited molecular states, but rarely both in tandem. I
will describe an R&D campaign to develop technologies suitable for a
hybrid detector, which will exploit both Cherenkov and scintillation
light to implement advanced event reconstruction techniques. This
campaign has culminated in the Eos demonstrator project, which will be
located on the UC Berkeley campus and act as a ton-scale demonstration
of technologies applicable for Theia, a proposed 25+ kiloton hybrid
detector. I will further discuss my work measuring cosmogenic background
production in SNO, a heavy water Cherenkov detector, and a search for
extraterrestrial antineutrinos in SNO+, an upgrade to SNO, which has
completed a phase of water running and is now filled with liquid
scintillator.
This is a HYBRID Meeting

Location: 50A-5132
Time: 4:00 – 5:00 PM
Title: “Snowmass Report Highlights – Part 3”

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SPEAKER - Andrzej Novak - RWTH Aachen University - Title: Searches for Higgs to Charm Decays with the CMS Experiment using Novel ML Methods
2022-11-15 16:00 - 17:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
TITLE: Searches for Higgs to Charm Decays with the CMS Experiment using Novel ML Methods

ABSTRACT: Searches for charm decays of the Higgs boson are not only limited by the small coupling but primarily by the considerable difficulty of identifying charm jets. However, recent advances in machine learning methods have drastically improved the performance of flavour identification algorithms. Applying them in analyses of the LHC Run2 data has enabled us to improve the limit on the Higgs to charm rate by a factor of 20 in the last few years. I will give an overview of the latest results obtained with the CMS experiment, focusing on the more recent boosted search.

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SPEAKER: Yuan-Tang Chou (University of Massachusetts, Amherst) - TITLE: Searches for Exotic Higgs Boson Decays with Modern Machine-Learning Methods at the LHC
2022-11-17 12:00 - 13:00 | HYBRID 50A-5132 (Sessler Conference Room), https://lbnl.zoom.us/j/91782268585, 50A-5132
THIS RPM WILL BE AT 12:00 P.M. NOON – November 17, 2022
TITLE – Searches for Exotic Higgs Boson Decays with Modern Machine-Learning Methods at the LHC
ABSTRACT – Advances in machine learning have shifted the paradigm in how we analyze data in High Energy Collider Physics. Particle identification and event reconstruction are areas where significant improvements have been possible by using state-of-art machine-learning methods with domain knowledge. In this talk, I will discuss how we adopt novel approaches that utilize low-level detector information and embed underlying symmetry in machine-learning models to search for physics beyond the Standard Model with the ATLAS experiment at the LHC.
Join Zoom Meeting
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Meeting ID: 917 8226 8585
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