LBNL Physics Division Research Progress Meetings

Zhicai Zhang (CalTech) "Search for Long-Lived Particles with Precision Timing Detectors"
2020-12-08 16:00 - 17:00 UTC | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
Searching for new physics beyond the standard model (BSM) has been one of the main goals of the LHC. With no new physics found in many SUSY and Exotica searches for prompt BSM particles from the LHC data, I will present a new BSM search approach that is looking for new particles with a long lifetime. The search is looking for SUSY long-lived particles that decay to photons, with the final state photon being time-delayed compared to prompt photon background. The search relies on the precise measurement of the photon arrival time at the calorimeter, and I will present the study of the timing performance of current CMS ECAL, and also developments of future precision timing detectors to be installed for CMS Phase 2 upgrade as well as precision timing detectors for future experiments.
http://physics.lbl.gov/rpm/index.php/events/
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Aniruddha Bapat (University of Maryland, College Park) "Variational Quantum Optimization in the NISQ Era"
2020-12-15 16:00 - 17:00
ABSTRACT:

Quantum information science in the coming decade will likely be carried out on noisy devices consisting of ~100-1000 qubits that do not share full interconnectivity. In this so-called NISQ regime, variational quantum algorithms, which tackle a wide range of problems from areas such as combinatorial optimization, quantum chemistry, and high-energy physics, provide a path to practical quantum advantage. In this talk, I will present some of our recent work that explores the theory behind variational algorithms such as quantum annealing and quantum approximate approximation algorithm (QAOA) using tools from optimal control theory. Then, I will discuss our work on finding the ground state of a critical Ising model on a trapped-ion quantum simulator, and the underlying optimization strategy. Finally, I will mention applications of our ideas and upcoming work.

http://physics.lbl.gov/rpm/index.php/events/
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Michael Kreshchuk (Tuft University) "Quantum simulation of relativistic field theories in the front form"
2020-12-17 16:00 - 17:00
Abstract:
I will talk about quantum simulation algorithms based on the light-front formulation of quantum field theory. They will range from
ab initio simulations with nearly optimal resource scalings to VQE-inspired methods available for existing devices.My work is greatly inspired by the analogy, first noted by Kenneth Wilson, between the light-front formulation of QFT and quantum
chemistry. The approach I develop to simulating field theory is an alternative to lattice techniques; it allows one to use methods
developed for quantum simulation of quantum chemistry.

http://physics.lbl.gov/rpm/index.php/events/

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Xinran Li (Princeton University) "The energy resolution and the energy deposition processes in noble liquid dark matter detectors"
2021-01-05 16:00 - 17:00
Abstract:

Noble liquid detectors, especially liquid argon and liquid xenon time projection chambers (TPCs) have been developed and improved during the last decades. They produced the best limits in the search for one of the best motivated dark matter candidates, weakly interacting massive particles (WIPMs), in the O(10)GeV to O(10)TeV mass region. I’ll first talk about the DarkSide-50 low mass analysis which produced the best limit of 5$times$10^{-42} cm^2 on spin-independent dark matter nuclear scattering cross section for dark matter masses around 3 GeV. The detector energy resolution around the analysis threshold strongly affects the shape of the limit curve in the low mass region. One main contribution to the energy resolution comes from the intrinsic fluctuations during the energy deposition processes, including the quenching processes and the charge recombination, in noble liquids. Extending to different materials, I’ll also mention the scintillation in xenon doped liquid argon, and the recombination in amorphous selenium. The energy resolution can be improved with sensitivity to the quenched heat energy. Superfluid helium 4 detectors have been proposed to probe nuclear recoil dark matter masses as low as O(10)MeV with current technology. The compatibility with phonon sensors permits sensitivity to all energy deposition channels in superfluid helium.

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Dylan Temples (Northwestern University) New Directions in Liquid Noble Dark Matter Searches: Probing the Sub-GeV Regime
2021-01-07 16:00 - 17:00
Abstract:

The most sensitive searches for dark matter (DM) with mass above ~10 GeV/c2 use the dual-phase xenon time-projection chamber (LXe-TPC) technology. In the U.S., development of this technology is spearheaded by the LUX-ZEPLIN experiment, with first science data coming soon. As these detectors increase in scale and sensitivity, previously negligible backgrounds become important to understand, both to prevent false discovery claims and to accurately measure the ultimate DM sensitivity of such an experiment. In this talk, I will discuss one class of such backgrounds: neutrinos scattering from the inner-shell electrons of a xenon atom. This process has heretofore gone uncalibrated, and due to its distinct event topology, is more akin to a nuclear recoil (potential DM signal) than an electron recoil (background). I will also discuss two liquid-noble technologies for searching for dark matter below ~5 GeV/c2: light-element doping, and superfluid helium detectors. Doping an LXe-TPC with low concentrations of light elements, such as hydrogen, enables sensitivity to dark matter models with mass down to 20 MeV/c2 while simultaneously probing spin-dependent DM-nucleon coupling. Superfluid helium detectors offer a complementary DM search avenue, as it is more sensitive to low-mass spin-independent DM than hydrogen-doping, but cannot investigate spin-dependent coupling.

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Digvijay Wadekar (New York University) "Accelerating analysis of cosmological surveys with novel analytic methods and machine learning"
2021-01-12 16:00 - 17:00
– Abstract:

In order to infer cosmological parameters from data of upcoming surveys like DESI, we will use summary statistics such as the power spectrum. An accurate estimate of their covariance matrix is crucial for the inference analysis. The traditional process of obtaining the covariance involves thousands of expensive mock simulations. I will present a novel analytic approach to calculate the covariance which is faster by more than four orders of magnitude. I will demonstrate the validation of our analytic approach with an analysis of the BOSS DR12 data and also show that it helps reduce the systematic error budget of cosmological constraints, thus making our approach useful for upcoming high-precision surveys like the Rubin observatory and DESI.

In the second part of my talk, I will present machine learning methods to emulate expensive hydrodynamical simulations and make cheap and accurate synthetic catalogs, which are needed for modeling non-linear scales in galaxy and line intensity mapping surveys.

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Etienne Dreyer (Simon Fraser University) Searching for new physics using high-energy lepton pairs and some other hot topics in ATLAS
2021-01-13 15:00 - 16:00
Abstract:
What is the nature of dark matter? What leads to the fundamental forces having such disparate strengths? Can we explain the small mass of the Higgs boson without excessive fine tuning? These outstanding questions are part of a broad motivation to continue investigating new physics scenarios beyond the Standard Model (SM). Several theoretical solutions propose an extended gauge symmetry group beyond the SM, and hence predict the existence of additional massive gauge bosons. I will discuss the latest search for a new neutral boson producing the particularly clean signature of two high energy leptons in the ATLAS detector.
In the second part of the talk I will share my ambitions for ongoing and future research in machine learning applications to particle physics, testing the SM in strategic connections to the Higgs boson, and work on the ATLAS Inner Tracker (ITk) upgrade.
http://physics.lbl.gov/rpm/index.php/events/
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Nandita Khetan (Gran Sasso Science Institute) "Cosmology in the multi-messenger era"
2021-01-14 16:00 - 17:00
Abstract:
The talk will present my PhD project research which focuses on advancing the standardization of various transients to be used as cosmological probes and the evaluation of the Hubble constant (H0). With SN Ia, I will present interesting results coming from a recent work where I used an alternate way to calibrate SN Ia based on the surface brightness fluctuations (SBF) method. Besides SNe Ia, I explored other exotic/new transients like Superluminous supernovae, Kilonovae and Gravitational waves as distance indicators. In particular, I worked on SLSNe in rest frame UV wavelengths to find peak luminosity correlations with light curve properties. I participated in a project exploring KNe as a standard candle to perform independent measurements of H0. I am currently working on the prospects of calibrating SNe Ia with GW distances measured from future GW detectors. I will briefly present these cosmological probes and discuss their future perspectives.

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Special RPM-Berkeley Cosmology Seminar | Sihan Yuan (Harvard University) Tackling the challenges of galaxy-dark matter connection modeling and secondary bias
2021-01-19 13:10 - 14:10
Abstract:
Modeling galaxy-dark matter connection is essential in deriving unbiased cosmological constraints from galaxy clustering observations. We show that a more physically motivated galaxy-dark matter incorporating secondary biases can result in more accurate predictions of galaxy clustering, and that it significantly reduces the tension in galaxy lensing. We further present progress in building a galaxy-dark matter connection framework that is rich in features and highly efficient in evaluation, enabling more robust cosmological analyses with upcoming DESI data.

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Kevin Woods (Stony Brook University) "Measuring neutrino oscillations with accelerator-based, long-baseline experiments"
2021-01-19 16:00 - 17:00
Abstract:

Accelerator-based, long-baseline neutrino oscillation experiments are uniquely positioned to explore the CP-violating nature of the neutrino sector. This talk will briey discuss the experimental technique before surveying selected topics spanning both current and future generations of such experiments. First, the Bayesian Markov Chain Monte Carlo oscillation analysis of the T2K experiment, which has been accumulating data for the past 10 years, will be presented before discussing the ongoing efforts to extend the analysis framework to be used in a joint analysis between T2K and the NOA experiment at Fermilab. The experience obtained from these experiments already in the data taking stages has been and will continue to be invaluable in the design of future experiments, such as the Deep Underground Neutrino Experiment (DUNE). The DUNE collaboration will employ the liquid argon time projection chamber (LArTPC) technology at an unprecedented scale to measure neutrino interactions at its far site. The talk will conclude with an overview of the realization and operation of the protoDUNE-SP detector, a prototype for a DUNE far detector module, for a charged particle test beam run that took place at CERN in the end of 2018

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Kathryn Sutton (Columbia University Department of Physics) "MicroBooNE's Search for a Photon-Like Low Energy Excess"
2021-01-21 16:00 - 17:00
Abstract:

MicroBooNE is a Liquid Argon Time Projection Chamber (LArTPC) detector and is the first of three such detectors to be commissioned as part of the Short Baseline Neutrino (SBN) program at Fermilab (FNAL), and has been taking data since 2015. One of its primary goals is to investigate the unexplained excess of electromagnetic events in the lowest energy ranges observed in the same neutrino beamline at the MiniBooNE experiment. While one leading interpretation of this anomaly is electron neutrino appearance due to sterile neutrino oscillations, a viable Standard Model explanation is neutrino-induced single photon events. The MicroBooNE single photon analysis looks to test this interpretation by measuring the rate of neutrino-induced resonant neutral current (NC) delta baryon production and subsequent delta radiative decay with a single photon in the final state, NC Δ→N𝛾. This measurement of a process that has never been observed before is projected to improve upon the current experimental limit from T2K by greater than a factor of thirty. This talk will present the status of the MicroBooNE single photon search, as well as ongoing work to create a more complete picture of single photon production in the SBN program.

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SPECIAL RPM-Berkeley Cosmology Seminar | Noah Weaverdyck (University of Michigan) "Controlling Systematics in Large-Scale Structure Surveys"
2021-01-26 13:10 - 14:10
Abstract:
Large-scale structure (LSS) surveys have exploded in size over the last few decades, cataloguing the locations and shapes of hundreds of millions of galaxies. The unprecedented precision enabled by such datasets puts extraordinary demands on the control of systematic errors. In this talk, I will discuss how extracting information from LSS surveys is complicated by systematics that enter the survey selection function, outline several approaches to address these systematics, and highlight important lessons for upcoming surveys.

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Vinicius Mikuni (University of Zurich) "Machine learning as a tool for Standard Model measurements."
2021-01-26 16:00 - 17:00
Abstract:
The Standard Model of particle physics described the interactions between the elementary particles that compose our universe. To study these interactions, protons collide at very high energies at the Large Hadron Collider, generating hundreds of particles through every bunch crossing. In this talk, I will present two measurements that probe different aspects of the Standard Model: the determination of the ttbb and bbH(bb) cross sections. I will show the challenges faced during data analysis and how modern machine learning methods can be used to improve the precision of these measurements.

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Elliott Reynolds (University of Birmingham) "Searching for New Physics using the Higgs Boson and Machine Learning"
2021-01-27 15:00 - 16:00
Abstract:

The Higgs boson is the only fundamental spin-0 particle in the Standard Model (SM) of particle physics, associated with an ever-present field that is the source of mass and linked to electroweak symmetry breaking, making it a particle like no other. Its mass and spin provide us with the strongest indication yet that something is amiss with the SM, and offer a unique window to probe the SM and new physics in its decays. This talk covers a broad range of searches sensitive to new physics in the Higgs sector using the ATLAS detector at the CERN LHC, with an emphasis on the versatile role of novel machine learning techniques. The related physics prospects of the high-luminosity upgrade of the LHC and the ATLAS detector are also discussed.

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Florian Bernlochner (Bonn) "Fantastic Bs and where to find them! "
2021-01-28 08:00 - 17:00
Abstract:
The Belle II Experiment is a next generation SuperB factory that aims to discover new physics phenomena at the highest intensities. It started its first physics run in 2019 and will until the end of 2021 collect a data set comparable to what the previous B-Factory experiments recorded during a decade-long run. I will review the current status, point out the contributions my group is strongly involved in, and provide an outlook for the summer conferences 2021.
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Mariel Pettee (Yale University) "The Search for VH (V → Leptons, H → 𝜏𝜏) with the ATLAS Experiment in Run 2"
2021-01-28 16:00 - 17:00
Abstract:

As part of a comprehensive plan to investigate the many combinations of production and decay of the Standard Model Higgs boson using the full Run 2 ATLAS dataset at the LHC, I will present a search for the SM Higgs boson produced in association with a leptonically-decaying vector boson (i.e. a W or Z boson) and decaying into a pair of tau leptons. Efficient identification of hadronically-decaying tau leptons at the trigger level is essential to this analysis, so I will also discuss my technical work in deploying an RNN-based tau identification scheme in the ATLAS High-Level Trigger (HLT) in Run 2. Lastly, I will show highlights of my independent AI work in leading teams of researchers across academia and industry to pioneer the state-of-the-art in AI-generated choreography using techniques including Variational Autoencoders (VAEs) and Graph Neural Networks (GNNs).

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SPECIAL RPM-Berkeley Cosmology Seminar | Anton Baleato Lizancos (University of Cambridge) "Fundamental Physics with CMB Lensing and Delensing: the Good, the Bad and the Systematics"
2021-02-02 13:10 - 14:10
Abstract:
Gravitational lensing of CMB photons by the matter distribution of the Universe can be both a blessing and nuisance. It’s a blessing because of the way it can be harnessed to map the structures responsible for the deflections, and from this, constrain any physics affecting the growth of cosmic structure, such as the sum of the neutrino masses or dark matter. But lensing is also a nuisance because it generates B-mode polarization which obscures the highly-sought-after primordial signal associated with gravitational waves generated during cosmic inflation, our most accessible portal to physics near the GUT scale. In this talk, I will focus on key systematic effects that need to be controlled in order to harness the full potential of the Simons Observatory (SO), CMB-S4, and other upcoming experiments to make progress in these exciting areas.

In the first part of my talk, I will briefly review the ways in which emission from galaxies and clusters can bias power spectra and cross-correlations of CMB lensing reconstructions, and describe our ongoing efforts to understand these biases analytically. Then, in the second part, I will explain how the lensing contamination to CMB B-modes can be removed — what is known as delensing — and discuss our recent findings regarding the performance of different delensing methods. I will also summarize preparatory work to delens SO data, and highlight biases to watch out for (and how to mitigate them) when the matter proxy used for delensing is either the cosmic infrared background or a lensing reconstruction derived from the CMB itself.

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Nitish Nayak (University of California, Irvine) "Ghostbusters : Estimation of Neutrino Oscillation Parameters by the NOvA Experiment"
2021-02-02 16:00 - 17:00
Abstract:
The discovery of neutrino oscillations provides the first indication of a lepton flavor violating (LFV) process, one that isn’t predicted by the Standard Model. Extending the Standard Model picture to account for this usually proceeds via the addition of new mass terms, either Dirac or Majorana in nature or both, to the Standard Model Lagrangian. Probing the LFV process by characterizing the strength of neutrino oscillations is therefore fundamental to understanding the nature of neutrino masses. In addition, there is a possibility that neutrino oscillations are CP-violating which can provide hints about the observed matter-antimatter asymmetry in the universe. The NOvA experiment at Fermilab was designed to be sensitive to such questions by measuring some of the key parameters governing oscillatory behaviour. It detects neutrinos (antineutrinos) using an intense beam of predominantly muon-neutrinos (muon-antineutrinos) from the NuMI facility at Fermilab. It does this by housing two detectors, a 1-kiloton Near Detector near the beam source and a massive 14-kiloton Far Detector, 810 km away, near the Canadian border. The measurement of neutrino oscillation parameters is performed by examining the neutrino beam and the simulation at the Near Detector and then observing how many neutrinos have oscillated by the time they reach the Far Detector. This is a challenging analysis highlighted by the fact that only a handful of oscillated events are observed at the Far Detector every year. This is made worse by the fact that the Far Detector is placed on the surface, thus collecting an enormous amount of cosmic background (at a rate of $sim$ 10 kHz). In this talk I will therefore provide an overview of how this measurement is performed and some of the key problems we wrestle with. These problems can be statistical, computational and even theoretical and so I will put particular emphasis on the methodologies used in overcoming them.

http://physics.lbl.gov/rpm/index.php/events/
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Geoff Penington (UCB) "Replica Wormholes, Entanglement Wedges and the Black Hole Information Paradox"
2021-02-11 16:00 - 17:00
Abstract:
Hawking famously argued, based on semiclassical calculations, that the radiation from evaporating black holes is contains no information about the matter that fell in. This would be inconsistent with the unitarity of quantum mechanics. In this talk, I will show that, in more careful ‘replica trick’ calculations, the gravitational path integral becomes dominated at late times by saddles containing spacetime wormholes. These wormholes cause the entropy to decrease after the Page time, consistent with unitarity, and allow information to escape from the interior of the black hole.
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David Weinberg (OSU) "Cosmology Past, Present, and Future"
2021-03-11 16:00 - 17:00
David Weinberg (OSU)

“Cosmology Past, Present, and Future”

I will give a broad overview of the current state of observational cosmology, with historical context and an eye to the future. Developments over the past three decades have led to a standard cosmological scenario that is remarkably successful at explaining a wide array of high precision measurements. However, this scenario leaves several big questions at best partially answered. What is dark matter? Why is the expansion of the universe accelerating? What is the physics of inflation and the
origin of the universe? I will discuss observational tensions that hint at cracks within the standard model, and I will discuss ongoing and upcoming experimental efforts that aim at order-of-magnitude increases in measurement precision with the hope of revealing vital new clues about the physics of the cosmos.

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Federico Meloni (DESY) Hunting Wino and Higgsino Dark Matter at the Muon Collider
2021-03-18 12:00 - 13:00
Abstract:
Events containing disappearing tracks originating from the decay of a heavy and electrically charged long-lived particle to a pair of undetectable particles are key to the discovery of compelling minimal dark matter models at collider experiments. This talk will present the prospects for a search for such experimental signature at a future muon collider. Techniques dedicated to the suppression of the backgrounds induced by the in-flight decays of the muon beams will be presented and the results compared to other future collider experiments in the context of MSSM higgsino and wino dark matter. In particular, this talk will show how a muon collider operating at a centre of mass energy of 10 TeV can rival, and in some cases outperform, the sensitivity of a 100 TeV proton proton collider.

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Timon Heim (LBNL) "Moving from the Prototyping to the Production Phase for the Inner Tracker Upgrade of the ATLAS Detector"
2021-03-25 16:00 - 17:00
Abstract:

As part of the Phase 2 upgrade of the ATLAS detector to ready it for operation at the High-Luminosity LHC the inner tracking system will be replaced by an all silicon Inner Tracker (ITk). The Pixel and Strip system of the ITK are now leaving the prototyping phase and preparing the start of the (pre) production phase. As part of this transition I plan to report on the latest status of the detector design and retrospectively discuss major design decisions which shaped the detector as it is now planned to be produced. In addition to looking at the latest tracking detector instrumentation, the scale of the ITk Pixel and Strip detector allows us to look at what challenges we might face for future equally sized or larger tracking detectors.

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Louise Skinnari (Northeastern) Track-triggering at CMS for the High-Luminosity LHC
2021-04-08 12:00 - 13:00
​Abstract:
​The high luminosity upgrade of the Large Hadron Collider (LHC), scheduled for 2025-2027, will significantly increase the instantaneous luminosity of the LHC collisions. The resulting large proton-proton collision datasets will allow precise measurements of Higgs​ boson​ properties, searches for ​very ​rare processes, and much more. To cope with the challenging ​experimental ​environment ​resulting ​from the high luminosity, significant upgrades will be required for the LHC ​detectors. A key upgrade of the CMS ​detector is to incorporate the identification of charged particle trajectories in the hardware-based trigger system, with potential to not only solidify the ​CMS ​trigger strategy but to enable ​searches for ​​completely new physics ​signatures. This seminar will discuss the motivation of the CMS track trigger, give an overview of the system, and discuss its expected performance based on simulation​ and hardware demonstration​​.
Slides
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Jamie Boyd (CERN) The FASER Experiment at the CERN LHC: Looking Forward to New Physics
2021-04-15 12:00 - 13:00
Abstract:
The Forward Search Experiment (FASER) is the newest experiment at the LHC, approved in 2019 and recently installed into the CERN LHC complex. It is a small and inexpensive experiment placed 500 meters downstream of the ATLAS interaction point. FASER is designed to capture decays of exotic particles, produced in the very forward region, out of the ATLAS detector acceptance. In addition, FASERnu, a FASER sub-detector, is designed to detect collider neutrinos for the first time and study their properties. This seminar will present the physics prospects, the detector design, and the construction and installation progress of FASER.

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Alberto Lusiani (INFN) "Muon magnetic anomaly measurement to 0.46 ppm at FNAL"
2021-04-20 12:00 - 13:00
ABSTRACT:

The Dirac equation predicted that the g-factor of spin 1/2 particles be 2, but in 1948 Julian Schwinger calculated that quantum electrodynamics (QED) fluctuations increase the electron and muon g-factor such that the anomaly a_(μ) = (g_(μ) − 2)/2 = α/2π at first order. Since then, many theorists have estimated an increasingly larger amount of Standard Model contributions to a_(μ), and in 2020 an international collaboration of theoretical and experimental physicists (Muon g-2 Theory Initiative) has published a Standard-Model-based prediction of a_(μ) with a 0.37 ppm precision, using the available information and calculations. The theory prediction uncertainty is dominated by the hadronic contributions, which have been primarily estimated using measurements of hadronic processes with dispersive techniques.
The muon magnetic anomaly a_(μ) = (g_(μ) − 2)/2 has been measured since 1959 at CERN, and the current 0.54 ppm precision world average has been published in 2006, using data collected at BNL in the years 1997-2001.
While the electron magnetic anomaly is measured and predicted with about three orders of magnitude better precision, the muon magnetic moment test of the Standard Model is more sensitive to hadronic effects and to most hypothetical New Physics contributions because the muon mass is about 200 times larger than the electron one. The sensitivity of the muon anomaly measurement extends to many New Physics effects that are searched in high energy experiments.
After a 3-years long analysis of data collected in 2018 at FNAL, the Muon g-2 collaboration has completed a measurement of the muon magnetic anomaly with a slightly improved precision of 0.46 ppm. The updated world average has a precision of 0.35 ppm and differs from the theory prediction by 4.2 standard deviations. We describe how the measurement has been performed by measuring the muon precession frequency is a storage ring and the magnetic field experienced by the muons and how the new world average has been computed. The precession frequency measurement dominates the uncertainty and has been completed by 6 independent groups with 4 different methods, obtaining consistent results. The data analysis has been performed in a blind way with a
special care for the internal consistency and the estimation of systematic biases and uncertainties.
The Muon g-2 collaboration aims at reducing the statistical uncertainty by a factor 2 in about 18 months from now, using data already collected, and eventually aims at collecting a total of about 20 times the statistics of the BNL data, to reach an ultimate precision of 0.14 ppm (0.10 statistical and 0.10 systematic).

http://physics.lbl.gov/rpm/index.php/events/

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http://physics.lbl.gov/rpm/index.php/events/
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Michael Peskin (SLAC) " A Gamma-Gamma Collider for Multi-10-TeV Physics"
2021-04-22 16:00 - 17:00
ABSTACT:
It is time to start thinking about the next-next generation of colliders, that is, colliders that access the multi-10-TeV region of parton center of mass energies. The discussion has already begun with consideration of FCC-hh and muon colliders, but those technologies are not here yet, and there is room for additional proposals. One that is interesting to me is plasma wakefield acceleration of electrons and conversion to a gamma-gamma collider. In this talk, I will discuss possible schemes for this, and technical and physics questions for the proposal that need to be addressed.

http://physics.lbl.gov/rpm/index.php/events/
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SPECIAL RPM | Joint Nuclear Science and Physics Division Seminar on muon g-2
2021-04-27 10:30 - 12:45
Joint Nuclear Science and Physics Division Seminar on muon g-2

Tuesday, April 27, 10:30am – 12:45pm
Zoom Meeting Link
Meeting ID: 927 0993 8569
Passcode: [REDACTED]

We are having a special seminar followed by a panel discussion on the recent g-2 result for the muon, with an emphasis on the theoretical prediction for this quantity.
10:30am : Welcome
10:35am: Kálmán Szabó
11:05am: Martin Hoferichter
11:40am: Panel discussion + audience question/answer
Panelists: Gilberto Colangelo (chair), Aida El-Khadra, Christoph Lehner, Bill Marciano and Thomas Teubner

Martin Savage (University of Washington) "Quantum Simulations for HEP and NP"
2021-04-29 16:00 - 17:00
Abstract:
Theoretical predictions of the properties and dynamics of quantum many-body systems of importance to High-energy and nuclear physics research are anticipated to require, in many instances, beyond classical computational resources. Such systems may be amenable to quantum simulations in the future, and the very first steps are now being taken towards these objectives. I will discuss the potential and status of this newly emerging area, with a focus on field theories.
Slides
http://physics.lbl.gov/rpm/index.php/events/
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Xiaosheng Huang (USF) "Strong Gravitational Lenses Discovered in the DESI Legacy Imaging Surveys"
2021-05-06 16:00 - 17:00
ABSTRACT:We have discovered over 1500 new strong lensing candidates in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys using residual neural networks. The photometric redshifts of the candidate lenses are broadly distributed between 0.1 and 1. Follow-up observations are underway. Our Hubble Space Telescope SNAP program has confirmed all 47 of the candidates observed so far and our DESI Secondary Targets program for Year 1 will likely observe ∼400 candidate systems. This sample will enable unprecedented tests of the cold dark matter model, e.g., by measuring the redshift evolution of the dark matter concentration and density profile slope. Furthermore, based on DESI spectra, an optimal set of systems can be selected for a targeted search for multiply-lensed supernovae, which can be used to determine the Hubble constant. Both objectives are highly complementary to the science goals of the DESI experiment.

http://physics.lbl.gov/rpm/index.php/events/
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Valerie Domcke (CERN) "Cosmology with Axion-Like Particles"
2021-05-25 12:30 - 13:30
ABSTRACT:

Axion-like particles may play a key role in early universe cosmology. They are naturally equipped with the right properties to explain cosmic inflation, can dynamically explain the smallness of the electroweak scale, may be involved in the generation of the matter antimatter asymmetry and are promising dark matter candidates. In this talk I discuss a generic but previously overlooked particle particle production mechanism, resulting in the dual production of gauge fields and fermions induced by axion-like particles. I will discuss how this crucially impacts all of the cosmological scenarios mentioned above and may be probed with upcoming gravitational wave detectors.

http://physics.lbl.gov/rpm/index.php/events/
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