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May 2020

Alexander Stibor (LBNL) “QIS with Coherent Electrons: Quantum Sensors, Superconducting Emitters, Signal Transmission and Decoherence Studies”

May 19 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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Abstract:  Creating, manipulating and detecting coherent, entangled quantum states and isolating quantum systems from decoherence is at the heart of future quantum information science technologies. With the rise of novel instruments in quantum electronics, the coherent emission and control of free electron beams become relevant in various fields of physics. In this presentation, I will give an overview of the research performed in Tuebingen (Germany) and at the LBL Molecular Foundry where we are currently realizing the QUINTESSENCE QIS project.…

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Alex Kim (LBNL)”Opportunities for Peculiar Velocity Surveys Using DESI, ZTF-II, and the Vera C. Rubin Observatory”

May 21 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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ABSTRACT: The motions of galaxies on top of the Hubble expansion, peculiar velocities, are a probe of clustering and the growth of structure in the Universe.  For distance indicators, peculiar velocities manifest themselves as residuals on the Hubble diagram.  Ongoing and upcoming wide-field surveys measuring unprecedented numbers of distance indicators, together with improvements in the calibration of Type Ia supernova brightnesses, will provide exquisite precision in the mapping of the peculiar velocity field or more precisely the peculiar distance field. …

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Daniel Carney (U. Maryland) “Fundamental Physics at the Quantum Limits of Measurement

May 26 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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Abstract: 40 years ago, Caves, Thorne, and their collaborators asked the question: what are the fundamental quantum limits on the measurement of a small position displacement? The answers to these conceptual questions led to the first direct detection of a gravitational wave by LIGO in 2016. I will review these types of quantum limits and discuss their application to particle physics. In particular, I will present some new dark matter detection ideas which leverage quantum sensing and control of massive…

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June 2020

Rakshya Khatiwada (Fermilab) “Hunting for Dark matter using quantum devices and sensors”

June 4 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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Rakshya Khatiwada (Fermilab) "Hunting for Dark matter using quantum devices and sensors" Abstract: Very few mysteries in our current picture of the universe are bigger than the puzzle of dark matter. Recently the QCD axion -- a weakly interacting, sub-eV particle -- has been in the limelight as a cold dark matter candidate which also enjoys compelling theoretical motivation as a possible solution to the strong CP problem. This talk will give an overview of modern axion searches with a…

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Stephen Gourlay (LBNL) “Snowmass 2021: Survey of Potential Collider Options”

June 11 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Beate Heinemann (DESY) “European Strategy for Particle Physics Update 2020”

June 25 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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.…

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July 2020

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”

July 9 @ 4:00 pm - 5:00 pm
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…

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Zara Bagdasarian (UCB) “Solar Neutrinos with Borexino: First Evidence of CNO Fusion Cycle”

July 16 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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JOINT INPA/RPM Seminar | Michelle Galloway (University of Zurich) “Observation of excess electronic recoil events in XENON1T”

July 17 @ 10:00 am - 11:00 am
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Josh McFayden (LBNL) “Unravelling LEP-Era Lepton Flavour Universality Discrepancy with ATLAS”

July 21 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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