LBNL Physics Division Research Progress Meetings

Florian Bernlochner (Bonn) "Fantastic Bs and where to find them! "
2021-01-28 08:00 - 17:00 UTC | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Elliott Reynolds (University of Birmingham) "Searching for New Physics using the Higgs Boson and Machine Learning"
2021-01-27 15:00 - 16:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Vinicius Mikuni (University of Zurich) "Machine learning as a tool for Standard Model measurements."
2021-01-26 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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SPECIAL RPM-Berkeley Cosmology Seminar | Noah Weaverdyck (University of Michigan) "Controlling Systematics in Large-Scale Structure Surveys"
2021-01-26 13:10 - 14:10 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Kathryn Sutton (Columbia University Department of Physics) "MicroBooNE's Search for a Photon-Like Low Energy Excess"
2021-01-21 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Kevin Woods (Stony Brook University) "Measuring neutrino oscillations with accelerator-based, long-baseline experiments"
2021-01-19 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Nandita Khetan (Gran Sasso Science Institute) "Cosmology in the multi-messenger era"
2021-01-14 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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.
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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
– 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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Dylan Temples (Northwestern University) New Directions in Liquid Noble Dark Matter Searches: Probing the Sub-GeV Regime
2021-01-07 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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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 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Michael Kreshchuk (Tuft University) "Quantum simulation of relativistic field theories in the front form"
2020-12-17 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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Aniruddha Bapat (University of Maryland, College Park) "Variational Quantum Optimization in the NISQ Era"
2020-12-15 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
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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──────────

Zhicai Zhang (CalTech) "Search for Long-Lived Particles with Precision Timing Detectors"
2020-12-08 16:00 - 17:00 | 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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Matt Klein (Michigan) "Search for Higgs boson decays to bottom quarks in the vector boson fusion production mode"
2020-12-03 16:00 - 17:00 | ca
ABSTRACT:
The Higgs boson is expected to decay to bb approximately 58% of the time. Despite the large branching fraction, due to the large background from SM events with b-jets, measuring this decay has been less precise than other, less frequent, decays. Measuring H(bb) in the VBF production mode has historically been insensitive, but developments in the background estimates and discrimination, as well as improvements in the signal extraction techniques, have resulted in an observed (expected) significance of 3.0 (3.0) standard deviations from the background-only hypothesis using the LHC Run 2 dataset.

http://physics.lbl.gov/rpm/index.php/events/
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Jesse Thaler (MIT) "The Hidden Geometry of Particle Collisions"
2020-11-05 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:

In this talk, I explain how various concepts and techniques in quantum field theory and collider physics can be naturally translated into a new geometric language. Using the energy mover’s distance, which quantifies the minimal amount of “work” required to rearrange one event into another, we can define a distance between pairs of collider events. This distance can then be used to triangulate the “space” of collider events and rigorously define various geometric objects. Many well-known collider observables, jet algorithms, and pileup mitigation schemes have a simple geometric interpretation, as does the important concept of infrared and collinear safety. Intriguingly, these ideas can be lifted from a distance between events into a distance between theories, with potential relevance for visualizing and interpreting data from the LHC.

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

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Donatella Lucchesi (INFN) ""Muon Collider: A Window to the Future""
2020-10-29 12:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:

Muon colliders represent a highly attractive option for future collider thanks to the possibility to reach very high center of mass energy, high luminosity with reasonable costs and dimensions. Nevertheless, the feasibility is not yet fully demonstrated and presents several challenges: muon beams production and operations from the machine side and beam-induced background mitigation on the detector part. Several progress have been achieved in the last years allowing to re-open the muon collider case. The detailed study of the beam-induced background has demonstrated that even the most challenging events like those involving b-jets can be efficiently reconstructed. This has triggered the study of several Higgs related processes in particular the double and triple Higgs production with sufficient precision to fully determine the Higgs potential. In the seminar a brief description of the machine will be followed by a discussion on the performance on detector and Higgs reconstruction.

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

Hannsjörg Weber (FNAL) "Triple Threat: The Observation of Tribosons "
2020-10-27 16:00 - 17:00 | ca
Hannsjörg Weber
Triple Threat: The observation of tribosons
Abstract:
We present the search for heavy triboson production, specifically targeting the production of WWW, WWZ, WZZ and ZZZ processes in multileptonic final states with 137/fb of data collected by the CMS detector during Run II of the LHC at a center-of-mass energy 13 TeV. The search is performed in final states with three, four, five, and six leptons (electrons or muons), or with two same-charge leptons plus two jets.
During this seminar, the physics behind the triboson process will be motivated, including a discussion on the difficulties to experimentally measure it. Then, the analysis strategy aimed to observe tribosons will be shown and the results will be presented. At the end, an outlook on future triboson studies and extensions towards probing the standard model and potential new physics will be given.

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

Simone Pagan-Griso (LBNL) "The Future of the Energy Frontier: Highlights from the Snowmass 2021 Process"
2020-10-22 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The Snowmass process is an opportunity for the entire HEP community to come together to identify and document a vision for the future of particle physics in the U.S. and its international partners. The Snowmass 2021 process is currently ongoing and scheduled to deliver a report in the fall of 2021. The work is divided in many areas (frontiers), spanning collider-based physics, neutrino physics, and cosmology, but including dedicated theory and instrumentation areas as well.
In this seminar, I will focus on highlighting some of the ideas and plans that have been forming in the area of the energy frontier, with particular focus on prospects for direct searches of Beyond-Standard-Model physics; I will also discuss some synergies with other areas, when relevant.

Andrej Obuljen (Waterloo) "Anisotropic Assembly Bias in Theory, Simulations and BOSS Data"
2020-10-15 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT
Clustering of matter on large scales provides an important source of information on key cosmological parameters. To extract this information we need to understand the relation between the tracers we observe and the underlying matter field. The clustering strength of halos and galaxies on large scales is linearly biased compared to the matter clustering. This linear bias mainly depends on halo mass and redshifts, though selections based on other scalar halo properties (age, spin, concentration etc.) show additional bias dependences — called assembly bias. Furthermore, non-scalar halo properties: shapes, velocity dispersion and angular momentum, are correlated with the large-scale tidal field. Selection effects that couple to these non-scalar halo properties can produce anisotropic clustering even in real-space and act as a contaminant to redshift-space distortion measurements, through an anisotropic assembly bias (AB). I will discuss our recent results on studying the halo AB using a large number of numerical simulations. Then I will present the first detection of the galaxy anisotropic assembly bias in BOSS DR12 galaxies. Finally, I will show other consequences and future prospects.
http://physics.lbl.gov/rpm/index.php/events/
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Nan Lu (Caltech) "Evidence for Higgs Boson Decay to a Pair of Muons from the CMS Experiment "
2020-10-01 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:

This seminar presents the search for the rare Higgs boson decay to a pair of muons performed by the CMS experiment at the LHC, based on the full Run 2 dataset. Events are categorized based on the characteristics of major Higgs boson production mechanisms and are analyzed using machine learning techniques, which significantly boosts the sensitivity of the search. A 3.0σ excess is observed in data, constituting the first evidence for the Higgs boson coupling to muons.

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

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Vivian Miranda (U. Arizona) "The Connected Universe: Relating Early, Intermediate and Late Universe with cosmological data"
2020-09-24 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The standard model of cosmology is built upon on a series of propositions on how the early, intermediate, and late epochs of the Universe behave. In particular, it predicts that dark energy and dark matter currently pervades the cosmos. Understanding the properties of the dark sector is plausibly the biggest challenge in theoretical physics. There is, however, a broad assumption in cosmology that the Universe on its earlier stages is fully understood and that discrepancies between the standard model of cosmology and current data are suggestive of distinct dark energy properties. Uncertainties on this hypothesis’s validity are not usually taken into account when forecasting survey capabilities, even though our investigations might be obfuscated if the intermediate and early Universe did behave abnormally. In this colloquium, I propose a program to investigate dark energy and earlier aspects of our Universe simultaneously, through space missions in the 2020s in combination with ground-based observatories. This program will help guide the strategy for the future Rubin and Roman supernovae and weak lensing surveys. My investigations on how properties of the early and intermediate Universe affect inferences on dark energy (and vice-versa) will also support community understanding of how future missions can be employed to test some of the core hypotheses of the standard model of cosmology.

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

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Yacine Ali-Haimoud (NYU) "Hunting for Dark Matter in the Early Universe"
2020-09-10 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:

It is now well established that the dominant part of non-relativistic matter in the Universe is some substance which appears to be oblivious to any force but gravity. The nature of this dark matter remains a nagging puzzle, and several candidates remain in the running. For instance, dark matter might be a new particle, as light as an electron, which might weakly interact with standard particles. Or it could be partly made of primordial black holes as massive as many Suns, born in the very early Universe from the gravitational collapse of enhanced primordial fluctuations. In this talk, I will describe how one can try and tease out some of the properties of dark matter from the Cosmic Microwave Background (CMB), both through its frequency spectrum, and its angular fluctuations. After reviewing the basic physics underlying the CMB, I will highlight how it can constrain interacting particles and primordial black holes. If time allows, I will discuss what LIGO may be able to tell us about primordial-black holes.

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

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Josh McFayden (LBNL) "Unravelling LEP-Era Lepton Flavour Universality Discrepancy with ATLAS"
2020-07-21 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:

A remarkable feature of the Standard Model (SM) is that each lepton flavour (electron, muon, tau) is equally likely to interact with a W boson. This is known as Lepton Flavour Universality.

In a recent ATLAS measurement, a novel technique using events with top-quark pairs has been exploited to test the ratio of the probabilities for tau leptons and muons to be produced in W boson decays, R(τ/μ).

In the SM, R(τ/μ) is expected to be unity, but a longstanding tension with this prediction has existed since the LEP era, where, from a combination of experiments, R(τ/μ) was measured to be 2.7σ higher than the SM expectation.

If the LEP result were confirmed to O(1%) precision it would correspond to an unambiguous discovery of beyond the SM physics. This latest ATLAS measurement obtains this level a precision – please join the RPM to discover whether or not it agrees with LEP!

http://physics.lbl.gov/rpm/index.php/events/
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JOINT INPA/RPM Seminar | Michelle Galloway (University of Zurich) "Observation of excess electronic recoil events in XENON1T"
2020-07-17 10:00 - 11:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
A search for new physics with XENON1T revealed an excess of electronic recoil events in the (1 – 7) keV region, favoring signal over background with significances of 3.5 sigma for solar axions/ALPs, 3.2 sigma for an enhanced neutrino magnetic moment, and 3.0 sigma global (4.0 local) for bosonic dark matter with a peak at 2.3 +- 0.2 keV (68% C.L.). Additionally, a previously undetected tritium component, favoured at 3.2 sigma over known backgrounds, can neither be confirmed nor excluded. I will provide an overview of the XENON1T detection and analysis methods for this search, a characterization of the excess events, and present results for both possible backgrounds and potential new physics.
https://lbnl.zoom.us/j/98002426771?pwd=R3dtTFhmb0ZyR0ZHV1E5amZCcnFBZz09
Meeting ID: 980 0242 6771
Password: 531232

Zara Bagdasarian (UCB) "Solar Neutrinos with Borexino: First Evidence of CNO Fusion Cycle"
2020-07-16 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
The prime energy producer in the sun is the fusion of hydrogen to form
helium. However, there is more than one way for this fusion to take
place: for stars the size of the sun or smaller, the proton-proton (pp)
chain reactions dominate (~99%), while in heavier stars, the
carbon-nitrogen-oxygen (CNO) cycle is expected to play a more important
role. Not only these fusion reactions would not have been possible
without the emission of neutrinos, neutrinos are the only way to
directly access the processes in the core of the sun.
Borexino experiment, located at the Laboratori Nazionali del Gran Sasso,
was built with a primary goal of the Be7 solar neutrinos (part of pp
chain) detection. In more than a decade of data taking, Borexino has not
only demonstrated the unprecedentedly high sensitivity towards Be7 solar
neutrinos (<3%) but performed a comprehensive study of low-energy
neutrinos from the complete pp-chain. After a number of developments in
both hardware and software, Borexino presents the first experimental
evidence of the up-to-now elusive CNO fusion cycle in the Sun. The
absence of the CNO neutrinos signal is disfavoured by the Borexino
experiment at 5σ.

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

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Kyle Dawson (U. Utah) "The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory"
2020-07-09 16:00 - 17:00 | 50-Auditorium
Abstract:
The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) concluded observations of the cosmic distance scale and the growth of structure in February, 2019. The three dimensional clustering in all samples from the Sloan Digital Sky Survey (SDSS) was used to make 15 distinct, high precision measurements of Baryon Acoustic Oscillations (BAO) to an effective redshift z<2.4 and six measurements of redshift space distortions (RSD) to z<1.5. With this redshift coverage and sensitivity, the SDSS experiment is unparalleled in its ability to explore models of dark energy. Using available cosmological samples, we provide new constraints on the cosmological model with an emphasis on the role of the final BAO and RSD clustering measurements in advancing the cosmological model. In this talk, I will give a brief overview of the BAO and RSD measurements and present the highlights of the advances in modeling dark energy, the local expansion rate, tests of general relativity, neutrino masses, and the overall cosmological model.

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

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Beate Heinemann (DESY) "European Strategy for Particle Physics Update 2020"
2020-06-25 12:00 - 13:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
Abstract:
I will present the updated European strategy for particle physics which was announced by the CERN Council in June. The strategy was developed in a process that spanned two years and engaged both the European and the international community of particle physics, as well as related scientific disciplines. The highest-priority physics recommendations are the study of the Higgs boson and the exploration of the high-energy frontier: two crucial and complementary ways to address the open questions in particle physics. Questions related to the dark universe, flavor and other puzzles of the Standard Model are also discussed. Finally, technological and societal challenges and opportunities are also highlighted.
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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Meeting ID: 917 8226 8585
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Stephen Gourlay (LBNL) "Snowmass 2021: Survey of Potential Collider Options"
2020-06-11 16:00 - 17:00 | Zoom Talk, 50A-5132, Berkeley, ca, 94720
ABSTRACT:

We are now approximately 3 months into the next Snowmass process and a plethora of ideas is starting to surface. Technical maturity of the proposed facilities ranges from shovel ready to those that are still largely conceptual. Developments in accelerator technology since the last Snowmass could increase the number of feasible ideas for P5 to consider. This talk will give a brief summary of some of the collider options; current status, technical readiness level and challenges, that we expect to see coming out of the current planning process.

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.
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Meeting ID: 917 8226 8585
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Meeting ID: 917 8226 8585
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Meeting ID: 917 8226 8585
──────────
