LBNL Physics Division Research Progress Meetings

Robin Hayes (University of British Columbia; Canada) “Probing the Standard Model Through Measurements of the Higgs Boson with the ATLAS Detector”
2021-11-30 16:00 - 17:00 UTC | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
As the most recently-discovered particle of the Standard Model (SM), the Higgs boson plays a key role in the quest to deepen our understanding of fundamental physics. Measurements of its production cross-sections probe for disagreement with the SM that might hint at signs of new physics. I will present recent measurements of gluon fusion (ggF) and vector boson fusion (VBF) Higgs production in the H->WW*->evuv decay channel, using data from the ATLAS detector at CERN’s Large Hadron Collider (LHC). These measurements are challenging due to the high-background environment, where on average fewer than one in one billion proton-proton collisions produces Higgs bosons. I will discuss novel analysis techniques and improvements that allow the first observation of the H->WW* process in the VBF channel and precise measurements of Higgs boson cross-sections in important kinematic regions. As preparations for the next LHC runs continue, I will lay out further ways in which the current and future LHC datasets can be exploited to creatively test the SM through Higgs physics.

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Oliver H.E. Philcox (Princeton) " Large Scale Structure Beyond the 2-Point Function"
2021-11-23 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
Quantum fluctuations in inflation provide the seeds for the large scale distribution of matter today. According to the standard paradigm, these fluctuations induce density perturbations that are Gaussian distributed. In this limit, all the information is contained within the pairwise distribution of galaxies, usually represented by a power spectrum. Today, the distribution of matter is far from Gaussian, with structures forming across a vast range of scales. To date, almost all spectroscopic analyses have used only the two-point function. This begs the question: can we extract more information using higher-point statistics?

In this seminar, I will present a pedagogical overview of the leading-order non-Gaussian statistics, and demonstrate how they can be used both to sharpen constraints on known physical parameters, and to provide stringent tests of new physics occurring in the early Universe. One of the major barriers to constraining cosmology from the higher-point functions is computational: measuring the statistics with conventional techniques is infeasible for current and future datasets. I will discuss new methods capable of reducing the computational cost by orders of magnitude, and show how this facilitates a number of exciting new tests of the cosmological model. Such techniques are already being applied to data from BOSS; the corresponding pipelines can be simply reapplied to DESI data, and will lead to sharper parameter constraints without additional observing time.

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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Dominique Trischuk (University of British Columbia) "Displaced Vertex Search for Heavy Neutral Leptons with the ATLAS Detector"
2021-11-22 15:00 - 16:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
This seminar will present recent results of a search for long-lived heavy neutral leptons (HNLs) in proton-protoncollisions at the Large Hadron Collider (LHC). The Standard Model (SM) of particle physics is an extremely successful theory and its major predictions have been precisely confirmed. However, the existence of neutrinos, with small nonzero masses, provides evidence that the SM is incomplete. Introducing HNLs into the SM is a natural wayto generate the light neutrino masses through a seesaw mechanism. This search uses 139 fb -1 of ATLAS experimental data collected between 2015 and 2018 at a centre-of-mass energy of 13 TeV. A non-standard techniqueis used to search for a displaced vertex from particle trajectories produced in the HNL decay to leptons. The dominant background from uncorrelated leptons crossing in the ATLAS detector is estimated using an objectshuffling method. The reconstructed HNL mass is used to discriminate between signal and background. No excessof events is observed and constraints on the strength of the interactions between HNLs and neutrinos are imposed in various scenarios.
This seminar will conclude with a presentation of methods used to study the detector performance and readout system of the ATLAS Inner Tracker (ITk). The LHC is currently undergoing upgrades that will enable it to produce more than ten times the data that has already been collected. To meet the requirements of this challenging new environment, an all-silicon particle tracking system will be installed in ATLAS.

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Emily Ann Thompson (DESY) "The Quest For Long-Lived Particles: Searching For Displaced Vertices and Tracking in the Trigger"
2021-11-18 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The existence of long-lived particles (LLPs) is a common feature in many theories beyond the Standard Model. For example, models with small couplings (i.e. R-parity-violating supersymmetry) and models with compressed mass spectra (i.e. co-annihilating dark matter) predict the presence of LLPs. With lifetimes ranging from picoseconds to nanoseconds, massive LLPs could decay to several electrically charged particles in the inner tracking volume of the ATLAS detector, resulting in the reconstruction of a displaced secondary vertex. Integrating tracking information into the trigger at an early stage is critical to enhancing the sensitivity of future searches for LLPs with displaced track signatures. The ATLAS Fast TracKer (FTK) aimed to achieve this by performing global, hardware-based track finding at a trigger rate of 100 kHz.
In this talk, searches for new long-lived massive particles leaving a displaced vertex signature in the ATLAS inner detector with the full Run-2 dataset are presented. Furthermore, the FTK system is presented and its application to LLP searches is discussed.

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Taylor Hoyt (University of Chicago) "Using Astrophysical Distance Indicators to Test Standard Cosmology"
2021-11-16 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
Measurements of the universe’s present-day expansion rate, or the Hubble constant (H0), that use a Cepheid variable star calibration of Type Ia supernovae (SNe Ia) are in >4σ disagreement with values predicted by the standard, Lambda cold dark matter (LCDM) model of the universe. In this talk, I will review the evidence for this “Hubble Tension” and discuss in particular my work on an alternative calibration of the SNe Ia using the Tip of the Red Giant Branch (TRGB), a standard candle that can return distances precise to 2% when observed in ancient populations of stars. Anchored by the TRGB, we derived in the Carnegie Chicago Hubble Program a SN value of H0 that is significantly less in tension with base LCDM (<2σ) than the Cepheid-calibrated SN H0, which raises the question of underestimated uncertainties and softens evidence for new physics. I will identify likely causes of this Cepheid-TRGB divergence, present paths to a potential resolution, and highlight how the astrophysical distance scale can converge on a self-consistent, 1% determ
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Caterina Vernieri (Stanford) "A "Cool" Route to Unveil the Higgs Boson’s Secrets"
2021-11-09 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
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 evidence that the Higgs field is indeed the unique source of mass for the known elementary particles, the next step is to search for new interactions that could also explain why the Higgs field has the properties required by the Standard Model of particle physics. We have no clear roadmap to this new theory but the Higgs boson plays a crucial role in this quest. This talk highlights the current experimental results of Higgs boson couplings to other particles and its self-coupling at the LHC and perspectives at future colliders. The goal of a next-generation collider is to carry out precision measurements to per-cent level of the Higgs boson properties that are not accessible at the LHC. The exploitation of the complementarity between LHC and future colliders will be the key to understanding fundamentally the Higgs boson. The Cool Copper Collider (C^3) is a new concept for linear e+e- collider that could provide a rapid route to precision Higgs physics with a compact footprint.
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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Laura Jeanty (Oregon) "Perspectives from Run 2: Status and Outlook for Supersymmetry Searches at the LHC"
2021-10-28 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
The second run of the LHC, from 2015-2018, produced an unprecedented trove of data in which the ATLAS and CMS collaborations have been searching for evidence of new particles and new phenomena. Supersymmetry remains one of the most promising theories for new physics accessible at the LHC which could address outstanding questions in particle physics, from why the Higgs Boson has the mass that it does to the particle nature of dark matter. As beam returns now to the LHC for the first time since 2018 and the start of Run 3 is around the corner, this talk will take a moment to summarize the status of searches for supersymmetry by the ATLAS and CMS experiments. The talk will highlight the Run 2 perspective on supersymmetry, with a focus on the experimental constraints, and will discuss some of the well-motivated ways in which it could have evaded detection thus far. The talk will conclude with an outlook for future searches.

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Derun Li (LBNL) "Overview of the Muon Collider challenges and R&D Progress under the US Muon Accelerator Program (MAP)"
2021-10-21 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:

There is an increasingly growing interest in Muon Collider in High Energy Physics community and Snowmass 2021. Considerable progresses have been made under the US Muon Accelerator Program (MAP) to target technical challenges associated with Muon Collider. The US MAP was recommended for termination by P5 in 2014, and all relavent R&D efforts and international MICE commitment officially ended in 2018. I will give an overview of the US MAP efforts on Muon Collider, technical challenges and progresses, in particular Berkeley Lab’s role and major contributions for Muon Collider R&D and international MICE. At the end, I would like to give an outlook of Muon Collider R&D and lessons learned from the US MAP and international MICE.

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Christian Bauer (LBNL) "Quantum computing for High Energy Physics"
2021-10-14 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
I will review the Quantum Computing efforts in the Physics division, with the goal of allowing to calculate important properties of the Standard Model non-perturbatively and ultimately to simulate scattering at colliders from first principles. I will present several results, both on physics simulations and on noise mitigation, which is crucial to obtain results on near-term devices.

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Kendall Mahn (Michigan State University) "Results from T2K and the current landscape of neutrino oscillation"
2021-10-07 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
Neutrinos are a tiny subatomic particle with surprising properties under active study. In particular, neutrinos oscillate, that is, they convert from one type of neutrino to another, is a surprising phenomenon under active study. The origin of neutrino mass is important for astrophysics, cosmology and particle physics, and many open questions surrounding neutrino oscillation exist. The Tokai-to-Kamioka (T2K) neutrino oscillation experiment sends a beam of muon flavor neutrinos or antineutrinos 295km across Japan. This seminar will discuss the state of the field of neutrino oscillation physics, including recent results from T2K, and T2K’s exciting future program.

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Talk Video Recording:
Kendall Mahn (Michigan State University) Talk

Nedaa Alexandra Asbah (Harvard) "Evidence of the Four-Top-Quark Production at the LHC"
2021-09-30 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
A summary of the latest results on the evidence of the four-top-quark production using proton-proton collision data at a centre of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139 fb−1. Events are selected if they contain a same-sign lepton (electron or a muon) pair or at least three leptons (2lSS/3l) or a single lepton or an opposite-sign lepton pair (1l/2lOS). A multivariate technique is used to discriminate between signal and background events in the signal rich regions.
The combined four top-quark production cross section is measured to be 24 +7/−6 fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only
predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0 ± 2.4 fb.
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Nedaa Alexandra Asbah (Harvard) Talk

Anya Butter (Heidelberg University) "Big Data Techniques for Precision Simulations and Optimal Observables"
2021-09-23 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:
Over the next years, measurements at the LHC and the HL-LHC will provide us with a wealth of data. The best hope of answering fundamental questions like the nature of dark matter, is to adopt big data techniques in simulations and analyses to extract all relevant information.
On the theory side, LHC physics crucially relies on our ability to simulate events efficiently from first principles. In the coming LHC runs, these simulations will face unprecedented precision requirements to match the experimental accuracy. Innovative ML techniques like generative models can help us overcome limitations from the high dimensionality of the parameter space. Such networks can be employed within established simulation tools or as part of a new framework.

At the analysis level, machine learning methods have already shown impressive performance boosts for instance in top tagging and jet calibration. While neural networks offer an attractive way to numerically encode functions, actual formulas remain the language of theoretical particle physics. Symbolic regression trained on matrix-element information provides optimal LHC observables in an easily interpretable form.

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Anja Butter (Heidelburg U.) Talk

Anna Porredon (Ohio State University) "Dark Energy Survey Year 3 Results from Galaxy Clustering and Weak Lensing"
2021-07-22 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:

The cosmological information extracted from photometric surveys is more robust when multiple probes of the large-scale structure of the universe are used. Two of the most sensitive probes are galaxy clustering and weak lensing. I will present cosmological results from the Dark Energy Survey first three years of observations combining those two probes, using an optimized lens sample of 11 million galaxies for the clustering measurements. The shear catalog used for weak lensing contains more than 100 million galaxies, constituting the largest dataset to date of this kind. I will show how we optimized the selection of this lens sample in terms of the forecasted cosmological constraints. Last, I will explain how we validated the analysis to deliver robust cosmological constraints.

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Pedro Ochoa-Ricoux (UCI) "JUNO: a 20 kton Multi-Purpose Observatory for Neutrino Physics and Astrophysics"
2021-06-24 16:00 - 17:00 | ca
Abstract:
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino detector under construction in China. With a 20 kton neutrino target, and an energy resolution of 3% at 1 MeV, it will be the largest and most precise liquid scintillator detector ever constructed. By studying the disappearance of antineutrinos emitted from 8 nuclear reactors at a strategic baseline of about 53~km, JUNO will determine the neutrino mass ordering to ~3σ significance within 6 years of running and will measure 3 neutrino oscillation parameters to sub-percent precision. JUNO will also study neutrinos from a variety of natural sources, such as the Earth, the Sun, and supernova explosions, and will deploy a satellite detector called JUNO-TAO that will measure the energy spectrum of reactor antineutrinos with unprecedented precision. The experiment is currently under construction, and completion is expected by 2022. JUNO’s physics prospects will be discussed in this talk alongside its ambitious design and current status.

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J. Pedro Ochoa-Ricoux (UCI)"TBA"
2021-06-24 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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Gaia Lanfranchi (INFN)
2021-06-17 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720

Julien Guy (LBNL)
2021-06-03 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720

Mike Williams (MIT) Searching for physics beyond the Standard Model at the LHCb experiment
2021-05-27 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The LHCb experiment at the Large Hadron Collider (LHC) at CERN has been the world’s premier laboratory for studying processes in which the quark types (or flavors) change since 2011. Such processes are highly sensitive to quantum-mechanical contributions from as-yet-unknown particles, e.g. supersymmetric particles, even those that are too massive to produce at the LHC. I will discuss the status of these searches, including some intriguing anomalies. I will also present searches for the proposed dark matter analogs of the photon and the Higgs boson. Planned future upgrades and the resulting physics prospects will also be discussed, including our plans to process the full 5 terabytes per second of LHCb data in real time in the next LHC run.
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Valerie Domcke (CERN) "Cosmology with Axion-Like Particles"
2021-05-25 12:30 - 13:30 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

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Xiaosheng Huang (USF) "Strong Gravitational Lenses Discovered in the DESI Legacy Imaging Surveys"
2021-05-06 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

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Martin Savage (University of Washington) "Quantum Simulations for HEP and NP"
2021-04-29 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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
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SPECIAL RPM | Joint Nuclear Science and Physics Division Seminar on muon g-2
2021-04-27 10:30 - 12:45 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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

Michael Peskin (SLAC) " A Gamma-Gamma Collider for Multi-10-TeV Physics"
2021-04-22 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

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Alberto Lusiani (INFN) "Muon magnetic anomaly measurement to 0.46 ppm at FNAL"
2021-04-20 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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).

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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Meeting ID: 917 8226 8585
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Louise Skinnari (Northeastern) Track-triggering at CMS for the High-Luminosity LHC
2021-04-08 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
​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
http://physics.lbl.gov/rpm/index.php/events/
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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

http://physics.lbl.gov/rpm/index.php/events/
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Federico Meloni (DESY) Hunting Wino and Higgsino Dark Matter at the Muon Collider
2021-03-18 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

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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David Weinberg (OSU) "Cosmology Past, Present, and Future"
2021-03-11 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.

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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.
http://physics.lbl.gov/rpm/index.php/events/
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──────────
