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PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
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X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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BEGIN:VTIMEZONE
TZID:America/Los_Angeles
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:20180311T100000
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TZOFFSETFROM:-0700
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DTSTART:20181104T090000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181101T160000
DTEND;TZID=America/Los_Angeles:20181101T170000
DTSTAMP:20260413T103130
CREATED:20181016T133016Z
LAST-MODIFIED:20181016T133016Z
UID:921-1541088000-1541091600@rpm.physics.lbl.gov
SUMMARY:Vivian Poulin (JHU) "Shedding Light on Dark Matter with the CMB: Implications for EDGES 21cm Signal"
DESCRIPTION:ABSTRACT: \nIn this talk\, I would like to review how the Cosmic Microwave Background (in particular its temperature and polarization anisotropies) can be used to perform both direct and indirect detection of Dark Matter.  In a first part\, I will show how the CMB can be used to put stringent constraints on DM models leading to energy injection\, such as DM annihilations and decay or Primordial Black Holes matter accretion. I will compare CMB bounds to those coming from galactic cosmic and gamma ray searches and illustrate how the 21cm signal\, a major target of next generation surveys\, can be used to significantly improve over current limits. In a second part\, I will discuss a recent puzzling absorption feature in the global 21cm signal observed by the EDGES experiment. Such feature could be explained by efficient scattering between DM and baryons in the late universe. I will show how the CMB strongly challenges such explanation of that signal.
URL:https://rpm.physics.lbl.gov/event/vivian-poulin-jhu-shedding-light-on-dark-matter-with-the-cmb-implications-for-edges-21cm-signal/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181106T160000
DTEND;TZID=America/Los_Angeles:20181106T170000
DTSTAMP:20260413T103130
CREATED:20180827T114444Z
LAST-MODIFIED:20180827T114444Z
UID:898-1541520000-1541523600@rpm.physics.lbl.gov
SUMMARY:Guy Ron (Jerusalem) "The Proton Radius - Old Measurements and New Ideas"
DESCRIPTION:ABSTRACT:\nThe radius of the proton\, generally assumed to be a well measured and understood quantity has recently come under scrutiny due to highly precise\, yet conflicting\, experimental results. These new results have generated a host of interpretations\, none of which are completely satisfactory.\nI will discuss the existing results\, focusing on the discrepancy between the various extractions. I will briefly discuss some theoretical attempts at reso-lution and focus on new scattering measurements\, both planned and already underway\, that are attempting to resolve the puzzle
URL:https://rpm.physics.lbl.gov/event/guy-ron-jerusalem-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181108T160000
DTEND;TZID=America/Los_Angeles:20181108T170000
DTSTAMP:20260413T103130
CREATED:20181106T132739Z
LAST-MODIFIED:20181106T132739Z
UID:944-1541692800-1541696400@rpm.physics.lbl.gov
SUMMARY:Lucie Tvrznikova (Yale) "Sub-GeV dark matter searches and electric field studies for the LUX and LZ experiments "
DESCRIPTION:ABSTRACT:\nThe Large Underground Xenon (LUX) and the LUX-ZEPLIN (LZ) detectors were designed to directly observe the interaction of dark matter (DM) with xenon target nuclei and thus probe much of the unexplored DM parameter space. I will discuss two novel direct detection methods\, Bremsstrahlung and the Migdal effect\, that were used by LUX to place limits on DM with masses of 0.4-5 GeV. I will also describe the development of a fully 3D model of electric fields that varied during the detector’s final 332 live-days of data acquisition. Since direct measurement of electric fields was not possible\, this work enabled a thorough understanding of the detector throughout its operation. Lastly\, I will present new results from the Xenon Breakdown Apparatus (XeBrA) built at LBNL to characterize the dielectric breakdown under high voltage in liquid xenon and liquid argon. Results from XeBrA will inform LZ and the future of noble liquid detector engineering.
URL:https://rpm.physics.lbl.gov/event/lucie-tvrznikova-yale-sub-gev-dark-matter-searches-and-electric-field-studies-for-the-lux-and-lz-experiments/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181113T160000
DTEND;TZID=America/Los_Angeles:20181113T170000
DTSTAMP:20260413T103130
CREATED:20181101T093507Z
LAST-MODIFIED:20181101T093507Z
UID:931-1542124800-1542128400@rpm.physics.lbl.gov
SUMMARY:Christian Herwig (U. Pennsylvania) " Targeting natural supersymmetry with top quarks"
DESCRIPTION:Abstract:\nWhat is the roadmap for the discovery of new physics in the\npost-Higgs-observation era? The concept of naturalness can provide a\nuseful guiding principle\, considering the interplay between new\, heavy\nphysics and the electroweak scale. I will describe a new search for\nnatural models of supersymmetry from the ATLAS experiment via the\nproduction of light top squarks. I will also discuss the impact of\nprecision top-quark measurements on future searches\, highlighting a\nrecent measurement of quantum interference in top-quark production.
URL:https://rpm.physics.lbl.gov/event/christian-herwig-u-pennsylvania-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181115T160000
DTEND;TZID=America/Los_Angeles:20181115T170000
DTSTAMP:20260413T103130
CREATED:20181101T093757Z
LAST-MODIFIED:20181101T093757Z
UID:933-1542297600-1542301200@rpm.physics.lbl.gov
SUMMARY:Stephane Brunet Cooperstein (Princeton) "Observation of Higgs Boson Decay to Bottom Quarks by the CMS Experiment"
DESCRIPTION:ABSTRACT: \nSince the discovery of the Higgs boson six years ago\, great progress has been made in measuring precisely its properties. These measurements have primarily been made via rare Higgs boson decays to two photons or two Z bosons due to their distinct experimental signatures. Although 60% of the Higgs bosons are predicted to decay to bottom quarks\, it was not originally expected to observe this Higgs boson dominant decay mode until much later in the LHC program due to an overwhelming background of bottom quarks produced via strong interactions. This milestone observation was achieved this summer by both the ATLAS and CMS experiments at the LHC. This seminar presents the observation of the Higgs boson decay to bottom quarks by the CMS experiment\, with an emphasis on the latest results using data collected in 2017. The observation was made possible by incorporating deep learning techniques and novel analysis methods. This constitutes the first observation of a Yukawa coupling to down-type quarks. Moreover\, it demonstrates the feasibility of the first precision measurements of Higgs bosons in the VH production mode in the near future.
URL:https://rpm.physics.lbl.gov/event/stephane-brunet-cooperstein-princeton-observation-of-higgs-boson-decay-to-bottom-quarks-by-the-cms-experiment/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181120T160000
DTEND;TZID=America/Los_Angeles:20181120T170000
DTSTAMP:20260413T103130
CREATED:20181101T104054Z
LAST-MODIFIED:20181101T104054Z
UID:935-1542729600-1542733200@rpm.physics.lbl.gov
SUMMARY:Jesse Liu (U. Oxford) "Opening New Frontiers for Supersymmetry and Dark Matter at the LHC"
DESCRIPTION:ABSTRACT:\nSmoking gun signals for new physics at the LHC elude us.\nWhat gaps remain under the lamppost? Where do we focus the next\ngeneration of searches? This talk tackles these pressing problems by\nhighlighting new frontiers opened by recent theoretical surveys\,\nextending ATLAS beyond its design capability\, and state-of-the-art\nanalysis strategies. Sensitivity to key supersymmetry targets\nmotivated by naturalness and WIMP dark matter are just surpassing two\ndecade old LEP limits. Striking blind spots remain around 100 GeV mass\nscales that invite creative discovery strategies for future efforts.
URL:https://rpm.physics.lbl.gov/event/jesse-liu-u-oxford-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181127T160000
DTEND;TZID=America/Los_Angeles:20181127T170000
DTSTAMP:20260413T103130
CREATED:20181101T104148Z
LAST-MODIFIED:20181101T104148Z
UID:937-1543334400-1543338000@rpm.physics.lbl.gov
SUMMARY:Elodie Deborah Resseguie (U. Pennsylvania) "Electroweak SUSY Searches on ATLAS"
DESCRIPTION:ABSTRACT:\nSupersymmetry (SUSY) gives a solution to the naturalness problem of the Standard Model (SM) while providing a candidate for dark matter\, solving two mysteries in modern physics. As the LHC collects more data and sets strong constraints on SUSY in the strong force sector within reach of the collider\, new SUSY particles produced by electroweak (EWK) processes remain significantly less unconstrained. The EWK production of SUSY particles can be observed by their decay via the W and Z gauge bosons to final states with two or three leptons and missing transverse momentum from invisible particles. Two SUSY models are considered: one with a Wino next-to-lightest SUSY particle (NLSP) and Bino LSP\, motivated by dark matter\, and another with a Higgsino LSP\, motivated by naturalness. The Higgsino LSP models are particularly challenging due to the small mass\, or “compressed”\, splittings\, leading to low energy W and Z bosons. This requires specialized techniques for triggering\, optimizing\, and estimating backgrounds. I will present the latest ATLAS searches for both models\, including the first result for Higgsino production since LEP\, as well the outlook for future studies.
URL:https://rpm.physics.lbl.gov/event/elodie-deborah-resseguie-u-pennsylvania-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181129T160000
DTEND;TZID=America/Los_Angeles:20181129T170000
DTSTAMP:20260413T103130
CREATED:20181101T105000Z
LAST-MODIFIED:20181101T105000Z
UID:939-1543507200-1543510800@rpm.physics.lbl.gov
SUMMARY:Karri DiPetrillo (Harvard U.) "Searching for long-lived particles with displaced vertices in ATLAS "
DESCRIPTION:ABSTRACT:\nMost searches for new physics at the Large Hadron Collider assume that a new particle produced in pp-collisions decays almost immediately\, or is non-interacting and escapes the detector. However\, a variety of new physics models predict particles which decay inside the detector at a discernible distance from the interaction point. Such long-lived particles would create spectacular signatures and evade many prompt searches. In this talk I will focus on a search for long-lived particles in events with a displaced vertex and a muon. I will also discuss challenges for the Muon Spectrometer in the face of increasing LHC luminosity.  
URL:https://rpm.physics.lbl.gov/event/karri-dipetrillo-harvard-u-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
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