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January 2021

Mariel Pettee (Yale University) “The Search for VH (V → Leptons, H → 𝜏𝜏) with the ATLAS Experiment in Run 2”

January 28 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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February 2021

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”

February 2 @ 1:10 pm - 2:10 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Nitish Nayak (University of California, Irvine) “Ghostbusters : Estimation of Neutrino Oscillation Parameters by the NOvA Experiment”

February 2 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Geoff Penington (UCB) “Replica Wormholes, Entanglement Wedges and the Black Hole Information Paradox”

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

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March 2021

David Weinberg (OSU) “Cosmology Past, Present, and Future”

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

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Federico Meloni (DESY) Hunting Wino and Higgsino Dark Matter at the Muon Collider

March 18 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Timon Heim (LBNL) “Moving from the Prototyping to the Production Phase for the Inner Tracker Upgrade of the ATLAS Detector”

March 25 @ 4:00 pm - 5:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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April 2021

Louise Skinnari (Northeastern)   Track-triggering at CMS for the High-Luminosity LHC  

April 8 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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​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…

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Jamie Boyd (CERN)  The FASER Experiment at the CERN LHC: Looking Forward to New Physics

April 15 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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Alberto Lusiani (INFN)  “Muon magnetic anomaly measurement to 0.46 ppm at FNAL”

April 20 @ 12:00 pm - 1:00 pm
Zoom Talk, 50A-5132
Berkeley, ca 94720
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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…

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