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PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
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X-WR-CALNAME:LBNL Physics Division Research Progress Meetings
X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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TZID:UTC
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TZOFFSETFROM:+0000
TZOFFSETTO:+0000
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DTSTART:20200101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20200204T160000
DTEND;TZID=UTC:20200204T170000
DTSTAMP:20260417T112334
CREATED:20190909T184824Z
LAST-MODIFIED:20200127T170523Z
UID:1204-1580832000-1580835600@rpm.physics.lbl.gov
SUMMARY:Matthew Solt (Stanford U) "The Heavy Photon Search Experiment
DESCRIPTION:Abstract: \n  \nThe Heavy Photon Search (HPS) experiment is a fixed target experiment at Jefferson Lab searching for a new dark-force mediator called a heavy photon (or dark photon or A’). A heavy photon is a hypothetical U(1) vector boson that couples to the Standard Model photon through kinetic mixing\, and thus can be produced in a process analogous to bremsstrahlung by an electron beam incident on a dense target. If kinematically allowed\, subsequent decays into e+e- pairs can be detected by the HPS detector – a compact\, large acceptance spectrometer consisting of a silicon vertex tracker and lead-tungstate electromagnetic calorimeter. For large couplings\, heavy photons would appear as a resonance peak in the invariant mass spectrum on top of a large QED background. For sufficiently small couplings\, heavy photons are long-lived and would appear as decay vertices displaced from the target beyond a prompt QED background. In this talk\, I will discuss the motivation for heavy photons and the HPS detector. I will then focus on the displaced vertex analysis and discuss the results from our engineering in 2015 (1.06 GeV beam energy)\, the ongoing analysis of the engineering run in 2016 (2.3 GeV beam energy)\, and finally the upgrades and commissioning of our most recent physics run in 2019 (4.55 GeV beam energy).
URL:https://rpm.physics.lbl.gov/event/reserved-49/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200206T160000
DTEND;TZID=UTC:20200206T170000
DTSTAMP:20260417T112334
CREATED:20190909T184849Z
LAST-MODIFIED:20190920T184732Z
UID:1206-1581004800-1581008400@rpm.physics.lbl.gov
SUMMARY:Reserved
DESCRIPTION:
URL:https://rpm.physics.lbl.gov/event/reserved-50/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200211T160000
DTEND;TZID=UTC:20200211T170000
DTSTAMP:20260417T112334
CREATED:20190909T185021Z
LAST-MODIFIED:20200205T231614Z
UID:1208-1581436800-1581440400@rpm.physics.lbl.gov
SUMMARY:Callum Wilkinson (Albert Einstein Center for Fundamental Physics) "Precision neutrino oscillation physics and DUNE "
DESCRIPTION:Abstract:  \nNeutrino oscillations have been established as an energy and distance dependent phenomena\, beyond the Standard Model of Particle Physics. However\, a number of key questions remain\, which have implications for our understanding of the origin and development of our Universe. The Deep Underground Neutrino Experiment (DUNE)\, which is currently in the planning stage\, has the potential to answer these outstanding questions and make measurements of the other parameters with unprecedented precision. This talk gives an overview of the DUNE sensitivity to oscillation parameters\, and describes a program of research aimed at reducing systematic uncertainties\, and achieving DUNE’s physics goals.
URL:https://rpm.physics.lbl.gov/event/reserved-53/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200213T160000
DTEND;TZID=UTC:20200213T170000
DTSTAMP:20260417T112334
CREATED:20190909T185034Z
LAST-MODIFIED:20200204T221236Z
UID:1210-1581609600-1581613200@rpm.physics.lbl.gov
SUMMARY:Ben Safdi (U. Michigan) "The Search for Axion Dark Matter
DESCRIPTION:Abstract: \nDark matter is the dominant source of matter in our Universe.  However\, while dark matter dictates the evolution of large-scale astrophysical systems through its gravitational effects\, the particle nature of dark matter is unknown.  In this talk I will review the current status of the search for the particle dark matter candidate called the axion\, which is both well-motivated theoretically and also relatively unexplored experimentally.  I will focus specifically on new large-scale numerical simulations of axion cosmology that lead to precise predictions for (i) the axion mass that gives the correct dark matter abundance\, and (ii) the structure of dark matter on small astrophysical scales.  I will show that axion dark matter may be harder to detect directly in the laboratory than previously thought\, given that the cosmological axions are mostly confined to compact minihalos\, but that this dark matter scenario may still be detectable using radio telescope searches for axion-induced radio lines.
URL:https://rpm.physics.lbl.gov/event/reserved-56/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200218T160000
DTEND;TZID=UTC:20200218T170000
DTSTAMP:20260417T112334
CREATED:20190909T185048Z
LAST-MODIFIED:20200218T044234Z
UID:1212-1582041600-1582045200@rpm.physics.lbl.gov
SUMMARY:Heidi Schellman (Oregon State U) "Computing for the DUNE Long Baseline Neutrino Oscillation Experiment "
DESCRIPTION:ABSTRACT: \n  \nThe DUNE long baseline neutrino oscillation collaboration consists of over 180 institutions from 33 countries. The experiment will consist of 4 10kT fiducial volume liquid argon TPC’s in South Dakota and a multi-system near detector at Fermilab. The far site in the Sanford Underground Laboratory is in preparation now with commissioning of the first 10kT fiducial volume Liquid Argon TPC expected over the period 2025-2028 and a long data taking run with 4 modules expected from 2029 and beyond. \nAn active prototyping program is already in place with a short test beam run with a 700T\, 15\,360 channel prototype of single-phase readout at the neutrino platform at CERN in late 2018 and tests of a similar sized dual-phase detector scheduled for mid-2019. The 2018 test beam run was a valuable live test of our computing model. The detector produced raw data at rates of up to ~2GB/s. These data were stored at full rate on tape at CERN and Fermilab and replicated at sites in the UK and Czech Republic. In total 1.8 PB of raw data were produced and reconstructed during the six week test beam run. \nBaseline predictions for the full DUNE detector data\, starting in the mid 2020’s are 30-60 PB of raw data per year. In contrast to traditional HEP computational problems\, DUNE’s Liquid Argon TPC data consist of simple but very large (many GB) 2D data objects which share many characteristics with astrophysical images. This presents opportunities to use advances in machine learning and pattern recognition as a frontier user of High Performance Computing facilities capable of massively parallel processing.
URL:https://rpm.physics.lbl.gov/event/reserved-59/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200220T160000
DTEND;TZID=UTC:20200220T170000
DTSTAMP:20260417T112334
CREATED:20190909T190024Z
LAST-MODIFIED:20200212T224917Z
UID:1214-1582214400-1582218000@rpm.physics.lbl.gov
SUMMARY:Simon Knapen (IAS) "Soft signals at the LHC"
DESCRIPTION:ABSTRACT:\nThe LHC is both a Higgs and B-factory\, and for both particles it will deliver the largest data set for many decades to come. I will discuss a few examples of ways we can leverage this to search for beyond the Standard Model physics. Some ideas can be implemented now\, while others rely on the phase II detector upgrades.
URL:https://rpm.physics.lbl.gov/event/reserved-60/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200225T160000
DTEND;TZID=UTC:20200225T170000
DTSTAMP:20260417T112334
CREATED:20190909T190328Z
LAST-MODIFIED:20200221T002813Z
UID:1216-1582646400-1582650000@rpm.physics.lbl.gov
SUMMARY:Raquel Castillo Fernandez (Fermilab) "Searching for Nu Physics with High Resolution Detectors"
DESCRIPTION:Abstract: \n\nNeutrino physics aims to answer some of the most pressing questions in particle physics: why the Universe is dominated by matter\, why the neutrino mass is so small and if there are more types of neutrinos. Due to the neutrino’s weakly interacting nature and the complexity of their interactions\, this research requires very large detectors able to identify low energy particles. This challenge has pushed the development of new technologies\, such as the liquid argon time projection chamber (LArTPC) detectors\, allowing for unprecedented precision in particle reconstruction\, and to expand the scientific program searching for more rare channels are present in some theories of new physics beyond the current standard model. After briefly reviewing the basis of neutrino physics\, I will introduce the main principles of the LArTPC detectors and how they can help us addressing some of the most relevant questions in particle physics. I will also describe the scientific achievements and the potential of the LArTPC neutrino program in the U.S.\, the current short (MicroBooNE/SBN) and the future long-baseline (DUNE) neutrino experiments.
URL:https://rpm.physics.lbl.gov/event/reserved-61/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20200227T160000
DTEND;TZID=UTC:20200227T170000
DTSTAMP:20260417T112334
CREATED:20190909T190342Z
LAST-MODIFIED:20200220T180430Z
UID:1218-1582819200-1582822800@rpm.physics.lbl.gov
SUMMARY:Ken Van Tilburg (NYU/IAS) "The Structure of Dark Matter on Small Scales"
DESCRIPTION:ABSTRACT:\n\nHalometry—mapping out the spectrum\, location\, and kinematics of nonluminous structures inside the Galactic halo—can be realized via effects that variable weak gravitational lensing induces on the proper motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cataloged objects. Astrometry thus offers a new and sensitive probe of collapsed dark matter structures over a wide mass range\, from one millionth to several million solar masses. It opens up a window into the spectrum of primordial density fluctuations with very small comoving wavenumbers\, scales hitherto poorly constrained.\n\nI will outline a program of detection strategies for dark matter substructure based on time-domain weak gravitational lensing\, after summarizing existing techniques and constraints. I will present first results from analyses based on Gaia’s second data release. Finally\, I will show that minimal models of axion-like dark matter naturally produce dense small-scale structures which can probed by the aforementioned astrometric lensing techniques.
URL:https://rpm.physics.lbl.gov/event/reserved-62/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
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