BEGIN:VCALENDAR VERSION:2.0 PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH 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 REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20180311T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20181104T090000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20190310T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20191103T090000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20181127T160000 DTEND;TZID=America/Los_Angeles:20181127T170000 DTSTAMP:20260413T175720 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:20260413T175720 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 BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20181204T160000 DTEND;TZID=America/Los_Angeles:20181204T170000 DTSTAMP:20260413T175720 CREATED:20181107T084111Z LAST-MODIFIED:20181107T084111Z UID:946-1543939200-1543942800@rpm.physics.lbl.gov SUMMARY:Danielle Norcini (Yale) "PROSPECTing for reactor neutrinos at short baselines" DESCRIPTION:ABSTRACT:\nExperiments at nuclear reactors have played a key role in determining the properties of the weakly-interacting neutrinos. PROSPECT is a next-generation experiment studying reactor neutrinos at very short baselines (< 10m) in an environment with limited shielding from cosmogenic backgrounds. Commissioned in March 2018\, the compact\, segmented detector unambiguously observed neutrinos in its first 2 hours of operation. In the months following\, PROSPECT has performed a world-leading search for “sterile” neutrino oscillations and made the world-leading measurement of the uranium-235 antineutrino energy spectrum. This talk will detail the detector design\, construction\, and first physics results. URL:https://rpm.physics.lbl.gov/event/danielle-norcini-yale-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:20181211T160000 DTEND;TZID=America/Los_Angeles:20181211T170000 DTSTAMP:20260413T175720 CREATED:20181101T091933Z LAST-MODIFIED:20181101T091933Z UID:929-1544544000-1544547600@rpm.physics.lbl.gov SUMMARY:Scott Haselschwardt (UCSB) " Expected Performance of the LZ Outer Detector and a Radioassay of its Gadolinium-Loaded Liquid Scintillator" DESCRIPTION:ABSTRACT:\nThe LZ (LUX-ZEPLIN) experiment is a second generation direct dark matter detector under construction at the Sanford Underground Research Facility (SURF) in Lead\, South Dakota\, USA. LZ will use a 7 tonne central liquid xenon target\, arranged in a dual-phase time projection chamber (TPC)\, to seek evidence for nuclear recoils from a hypothesized galactic flux of weakly interacting massive particles (WIMPs). Surrounding the LZ TPC will be an outer detector (OD) consisting of 17.3 tonnes of LAB-based gadolinium-loaded liquid scintillator (GdLS). The OD’s primary functions will be to tag neutron single-scatter events in the liquid xenon which could mimic a WIMP dark matter signal and to characterize the radiation environment of LZ. In this talk\, I summarize the expected performance of the OD and report on the design and results of the “Screener”\, a small liquid scintillator detector consisting of ≈ 23 kg of the GdLS to be used in the OD. The Screener was operated in the ultra-low-background environment of the former LUX water shield in the Davis Laboratory at SURF for radioassay of the GdLS. Careful selection of detector materials and use of ultra-low-background PMTs allows the measurement of a variety of radioimpurities. In particular\, the 14C/12C ratio in the scintillator is measured\, while the use of pulse shape discrimination allows the concentration of isotopes throughout the 238U\, 235U\, and 232Th chains to be measured by fitting the collected spectra from α and β events. The GdLS is found to meet the requirements for LZ\, however\, more aggressive purification is being implemented for the final GdLS product that ensures the OD will successfully carry out its role in the hunt for WIMP dark matter. URL:https://rpm.physics.lbl.gov/event/scott-haselschwardt-tba-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:20181213T160000 DTEND;TZID=America/Los_Angeles:20181213T170000 DTSTAMP:20260413T175720 CREATED:20181107T084221Z LAST-MODIFIED:20181107T084221Z UID:948-1544716800-1544720400@rpm.physics.lbl.gov SUMMARY:Brooke Russell (Yale) "Leveraging LArTPC Technology to Definitively Resolve the MiniBooNE Anomaly - An Elctron Neutrino Appearance Search at MicroBooNE" DESCRIPTION:ABSTRACT:\nMicroBooNE is a single-phase liquid argon time projection chamber (LArTPC) short-baseline accelerator neutrino experiment located at Fermilab on the Booster neutrino beamline. MicroBooNE’s foremost scientific objective is to address the low energy excess of single shower electromagnetic events seen by the precursor MiniBooNE experiment. Leveraging the fine-grained drifted ionization charge signal from particle interactions\, LArTPCs provide detailed topological and calorimetric information for physics analyses. By capitalizing on the interplay between scintillation light and 3D ionization charge imaging\, a high efficiency\, low background analysis is in development to address MiniBooNE’s anomalous result. The status of this analysis is described. URL:https://rpm.physics.lbl.gov/event/brooke-russell-yale-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:20181220T160000 DTEND;TZID=America/Los_Angeles:20181220T170000 DTSTAMP:20260413T175720 CREATED:20181121T100121Z LAST-MODIFIED:20181121T100121Z UID:961-1545321600-1545325200@rpm.physics.lbl.gov SUMMARY:Sunny Vagnozzi (Stockholm University) "Recent Developments in Neutrino Cosmology" DESCRIPTION:ABSTRACT:\nA robust detection of neutrino masses is avowedly among the key goals of several upcoming Cosmic Microwave Background (CMB) and Large-Scale Structure (LSS) surveys. In this talk\, I will describe recent progress in neutrino cosmology on three fronts. Firstly\, I will illustrate the wealth of information on the sum of the neutrino masses obtainable from current cosmological probes\, focusing on LSS data. Current upper limits begin favoring the normal neutrino mass ordering\, emphasizing the need to develop statistical tools for quantifying this preference. Next\, I will discuss galaxy bias as a limitation towards fully capitalizing on neutrino information hidden in LSS data\, proposing a method for calibrating the scale-dependent galaxy bias using CMB lensing-galaxy cross-correlations. Moreover\, in massive neutrino cosmologies the bias as usually defined is scale-dependent even on large scales: neglecting this effect will lead to incorrectly inferred parameters. Finally\, I will take on a different angle and discuss degeneracies between neutrinos and other cosmological parameters. I will show how in certain physically motivated dynamical dark energy models the neutrino mass upper limits tighten instead of broadening\, discussing implications for future laboratory determinations of the mass ordering. I will also discuss how neutrino unknowns affect constraints on inflationary models. URL:https://rpm.physics.lbl.gov/event/sunny-vagnozzi-stockholm-university-recent-developments-in-neutrino-cosmology/ LOCATION:INPA Common Room (50-5026)\, 50-5026 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190103T160000 DTEND;TZID=America/Los_Angeles:20190103T170000 DTSTAMP:20260413T175720 CREATED:20181210T091738Z LAST-MODIFIED:20181210T091738Z UID:974-1546531200-1546534800@rpm.physics.lbl.gov SUMMARY:Dmitry Budker (UCB/Mainz) "Recent Results in Mains on the Search for Ultralight DM or Parity Violation in a Chain of Yb Isotopes\, and Related Developments" DESCRIPTION: URL:https://rpm.physics.lbl.gov/event/dmitry-budker-ucb-mainz-recent-results-in-mains-on-the-search-for-ultralight-dm-or-parity-violation-in-a-chain-of-yb-isotopes-and-related-developments/ LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190108T160000 DTEND;TZID=America/Los_Angeles:20190108T170000 DTSTAMP:20260413T175720 CREATED:20181205T112806Z LAST-MODIFIED:20181205T112806Z UID:967-1546963200-1546966800@rpm.physics.lbl.gov SUMMARY:Stefano Soleti (Oxford/Harvard U.) "Searching for a Low-Energy Excess at MicroBOONE" DESCRIPTION:ABSTRACT:\nThe last twenty years have seen a spectacular improvement in our understanding of neutrino oscillations and neutrino physics in general. However\, several experiments have shown some puzzling results which do not fit the standard three-flavor mixing scheme of neutrinos. In particular\, the LSND and MiniBooNE experiments observed an excess of low-energy electron neutrinos\, which could be interpreted as the signature of a fourth\, non-weakly interacting\, neutrino. The goal of the MicroBooNE experiment\, a liquid argon time projection chamber currently running at Fermilab\, is to assess the nature of this excess. In this talk the first automated electron neutrino search in a LArTPC will be presented. This result is the first step towards a measurement of the low-energy excess at MicroBooNE. URL:https://rpm.physics.lbl.gov/event/stefano-soleti-tba/ LOCATION:INPA Common Room (50-5026)\, 50-5026 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190117T160000 DTEND;TZID=America/Los_Angeles:20190117T170000 DTSTAMP:20260413T175720 CREATED:20181213T095254Z LAST-MODIFIED:20181213T095254Z UID:977-1547740800-1547744400@rpm.physics.lbl.gov SUMMARY:Cheng-Ju Stephen Lin (LBNL) " ProtoDUNE: Path Towards Building the Largest Liquid Argon Neutrino Detectors" DESCRIPTION:Abstract:\nA large international collaboration has been formed to carry out an ambitious project to build the Deep Underground Neutrino Experiment (DUNE) for investigating fundamental questions in neutrino and proton decay physics. The DUNE far detector consists of four time-projection chambers (TPC) filled with 70\,000 tons of liquid argon. It wil by far be the largest liquid argon neutrino experiment ever built. The ProtoDUNE experiment aims to validate the design and construction of the DUNE far detector by operating two kton-scale prototype detectors in a charged-particle beam at CERN. These two detectors will help assess different technologies for TPC ionization drift and readout (single and dual phase TPC) that are being considered in DUNE. In this talk I will discuss the challenges of building the large prototype detectors and present some preliminary results from operation of the single-phase ProtoDUNE detector. URL:https://rpm.physics.lbl.gov/event/cheng-ju-stephen-lin-lbnl/ LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190122T160000 DTEND;TZID=America/Los_Angeles:20190122T170000 DTSTAMP:20260413T175720 CREATED:20190107T095453Z LAST-MODIFIED:20190107T095453Z UID:989-1548172800-1548176400@rpm.physics.lbl.gov SUMMARY:Joannes Lange (Yale) "Probing Galaxy Formation and Cosmology in the Non-Linear Regime" DESCRIPTION:Abstract:\nCurrent and future galaxy surveys have the potential to transform our understanding of both galaxy formation and cosmology. The distribution of galaxies and matter on small\, non-linear scales (~Mpc) holds the most statistical constraining power but is also the most challenging to model. In this talk\, I will concentrate on three distinct probes on small scales: galaxy clustering\, galaxy-galaxy lensing and satellite kinematics. I will present new measurements of the tension between clustering and lensing in the BOSS survey. The most promising explanations for this tension\, baryonic feedback\, assembly bias and cosmological parameters different from the Planck CMB constraints\, are discussed. Furthermore\, I will present an updated\, more robust analysis to extract constraints on the galaxy-halo connection from satellite kinematics. The accuracy of this approach is tested using a large number of realistic mock catalogs and shown to yield unbiased\, highly competitive constraints. I then apply this updated analysis to the SDSS survey and compare the inferences from satellite kinematics to those from previous studies. Finally\, I will discuss future directions for modeling non-linear scales which will allow to unlock the full potential of upcoming surveys like DESI or LSST. URL:https://rpm.physics.lbl.gov/event/joannes-lange-yale-probing-galaxy-formation-and-cosmology-in-the-non-linear-regime/ LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190124T160000 DTEND;TZID=America/Los_Angeles:20190124T170000 DTSTAMP:20260413T175720 CREATED:20181213T095412Z LAST-MODIFIED:20181213T095412Z UID:979-1548345600-1548349200@rpm.physics.lbl.gov SUMMARY:Ximo Poveda Torres (CERN) " The Top-Higgs Connection: Measuring ttH Production with the ATLAS Experiment DESCRIPTION:Abstract: \nThe measurement of the Yukawa coupling of the top quark and\nthe Higgs boson\, namely the two most massive fundamental particles\nobserved so far\, is a crucial piece for understanding the mechanism of\nfermion mass generation. The most promising way to directly probe this\ncoupling is by measuring the Higgs boson production in association with\na top quark pair (ttH). ATLAS recently observed ttH production using\n√s=13 TeV LHC pp collision data\, exploiting several Higgs boson decay\nchannels. Current ttH results will be summarized in this seminar\, and\nprospects for future measurements will also be discussed. URL:https://rpm.physics.lbl.gov/event/ximo-poveda-torres-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:20190129T160000 DTEND;TZID=America/Los_Angeles:20190129T170000 DTSTAMP:20260413T175720 CREATED:20190107T100001Z LAST-MODIFIED:20190107T100001Z UID:991-1548777600-1548781200@rpm.physics.lbl.gov SUMMARY:Jose Luis Bernal (Barcelona U.) "Synenergies and Fundamental Physics from the Large Scale Structure DESCRIPTION:Abstract: \nGalaxy surveys and the study of the Large Scale Structure (LSS) have played an important role in establishing the standard cosmological model\, LCDM\, and will push the envelope of observational cosmology the next decades\, thanks to experiments such as DESI and Euclid. In this talk\, I will show how we can use LSS observations and techniques to address the tension in the Hubble constant\, the origin of supermassive black holes and the nature of dark matter.\n \nFurthermore\, the ever larger volumes surveyed by next-generation galaxy surveys will enable access to the ultra-large scales\, where signatures of General Relativity and inflation are significant. This will allow us to probe the nature of gravity and the very first instants of the Universe\, but also requires a very specific methodology\, which I will discuss during the talk. URL:https://rpm.physics.lbl.gov/event/jose-luis-bernal-barcelona-u-synenergies-and-fundamental-physics-from-the-large-scale-structure/ LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190214T160000 DTEND;TZID=America/Los_Angeles:20190214T170000 DTSTAMP:20260413T175720 CREATED:20190109T113207Z LAST-MODIFIED:20190109T113207Z UID:997-1550160000-1550163600@rpm.physics.lbl.gov SUMMARY:Kendrick Smith (Perimeter Institute) "CHIME: The Canadian Hydrogen Intensity Mapping Experiment" DESCRIPTION:Abstract:\nCHIME is a new interferometric telescope at radio frequencies 400-800 MHz.\nThe mapping speed (or total statistical power) of CHIME is among the largest\nof any radio telescope in the world\, and the technology powering CHIME could\nbe used to build telescopes which are orders of magnitude more powerful.\nRecently during precommissioning\, CHIME started finding new fast radio\nbursts (FRB’s) at an unprecedented rate\, including a new repeating FRB.\nUnderstanding the origin of fast radio bursts is a central unsolved problem\nin astrophysics\, and we anticipate that CHIME’s statistical power will play an\nimportant role in solving it. In this talk\, I’ll give a status update on CHIME\, with\nemphasis on FRB’s. URL:https://rpm.physics.lbl.gov/event/kendrick-smith-perimeter-institute-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:20190219T160000 DTEND;TZID=America/Los_Angeles:20190219T170000 DTSTAMP:20260413T175720 CREATED:20190107T103128Z LAST-MODIFIED:20190107T103128Z UID:993-1550592000-1550595600@rpm.physics.lbl.gov SUMMARY:Nathan Lourie (U. Pennsylvania) "Sub-arcminute Galactic Polarimetry with the Next Generation Balloon-borne Large-Aperture Submillimeter Telescope (BLAST-TNG)" DESCRIPTION:Abstract:\nMapping the polarized thermal dust emission from our galaxy is important for many fields of astrophysics\, and recent observations reveal a complex network of filamentary structures which pervade the interstellar medium and molecular clouds\, and are rich with prestellar cores. In the infrared and submillimeter\, polarized dust emission traces magnetic field patterns which reveal key insights in to the physical processes which regulate the formation of filaments and stars\, while for measurements of the cosmic microwave background (CMB) this dust emission is the dominant foreground.\nThe Next Generation Balloon-borne Large Aperture Submillimeter Telescope (BLAST-TNG) is a submillimeter mapping experiment planned for a long-duration balloon (LDB) flight from McMurdo Station\, Antarctica during the 2018-2019 season. BLAST-TNG is the successor to the BLAST-Pol telescope which flew from Antarctica in 2010 and 2012\, and produced degree-scale maps of molecular clouds at arcminute resolution. BLAST-TNG will detect submillimeter polarized interstellar dust emission\, tracing magnetic fields in galactic molecular clouds. BLAST-TNG will be the first polarimeter with the sensitivity and resolution to probe the ~0.1 parsec-scale features that are critical to understanding the origin of structures in the interstellar medium. BLAST-TNG will also be able to make the deepest maps to date of the dust emission in the types of dark\, diffuse regions of the sky favored by state of the art CMB polarization experiments. BLAST-TNG will probe angular scales not well-characterized to date\, and explore correlations between diffuse dust emission and structures in the cold neutral medium at submillimeter wavelengths where the intensity of the thermal dust signal dominates. URL:https://rpm.physics.lbl.gov/event/nathan-laurie-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:20190221T160000 DTEND;TZID=America/Los_Angeles:20190221T170000 DTSTAMP:20260413T175720 CREATED:20190204T105852Z LAST-MODIFIED:20190204T105852Z UID:1008-1550764800-1550768400@rpm.physics.lbl.gov SUMMARY:Masayuki Wada (Princeton) " WIMP Dark Matter Search from Ionization Channel in DarkSide-50" DESCRIPTION:Abstract:  \nIn spite of a wide range of observational evidence\, the mystery of dark matter is still present and dark matter remains to be directly detected. One of the most popular Dark Matter candidates is the Weakly Interacting Massive Particle (WIMP). In this talk\, I present two results from the DarkSide-50 experiment for high-mass WIMP search and for low-mass WIMP search. In the low-mass WIMP search\, there is an excess over the known background events at the small number of electrons region (Ne < 7). An updated study on this excess will be presented. URL:https://rpm.physics.lbl.gov/event/masayuki-wada-princeton-wimp-dark-matter-search-from-ionization-channel-in-darkside-50/ LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20190228T160000 DTEND;TZID=America/Los_Angeles:20190228T170000 DTSTAMP:20260413T175720 CREATED:20181213T095445Z LAST-MODIFIED:20181213T095445Z UID:981-1551369600-1551373200@rpm.physics.lbl.gov SUMMARY:LianTao Wang (U. Chicago) " Physics of Future Colliders" DESCRIPTION:ABSTRACT:\nAfter the discovery of the Higgs boson\, the future of high energy physics became a central question. There have been several proposals of future colliders which would continue the exploration of the high energy frontier beyond the reach of the LHC. Their fate could be determined in this couple of years. I will give an overview of the physics cases for these proposals\, and offer my own perspective on the road ahead. URL:https://rpm.physics.lbl.gov/event/lian-tao-wang-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:20190305T160000 DTEND;TZID=America/Los_Angeles:20190305T170000 DTSTAMP:20260413T175720 CREATED:20190208T150408Z LAST-MODIFIED:20190208T150408Z UID:1019-1551801600-1551805200@rpm.physics.lbl.gov SUMMARY:Yoshikazu Nagai (U. Colorado) "Understanding Neutrino Beams: Hadron Production Measurements with NA61/SHINE" DESCRIPTION:ABSTRACT:\nA precise prediction of the neutrino flux is a key ingredient for achieving the physics goals of accelerator-based neutrino experiments. In modern experiments\, neutrino beams are created from the decays of secondary hadrons produced in hadron-nucleus interactions. Hadron production is the leading systematic uncertainty source on the neutrino flux prediction; therefore\, its precise measurement is essential.\nThe NA61/SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target experiment at the CERN Super Proton Synchrotron which studies hadron production in hadron-nucleus and nucleus-nucleus collisions for various physics goals. For neutrino physics\, light hadron beams (protons\, pions\, and kaons) are collided with a light nuclear target (carbon\, aluminum\, and beryllium) and spectra of outgoing hadrons are measured. In this talk\, I will present recent results and ongoing analyses of hadron production measurements at NA61/SHINE for precise neutrino flux predictions in the T2K and Fermilab-based long-baseline neutrino experiments. I will also discuss the necessity and prospects of further hadron production measurements for the next generation neutrino experiments with NA61/SHINE beyond 2020\, after the Long Shutdown 2 of the accelerator complex at CERN. URL:https://rpm.physics.lbl.gov/event/yoshikazu-nagai-u-colorado-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:20190307T160000 DTEND;TZID=America/Los_Angeles:20190307T170000 DTSTAMP:20260413T175720 CREATED:20190304T142847Z LAST-MODIFIED:20190304T142847Z UID:1037-1551974400-1551978000@rpm.physics.lbl.gov SUMMARY:Emanuele Castorina (UCB) "Cosmology with Neutral Hydrogen in the Post Eeionization Era" DESCRIPTION:ABSTRACT:\n \nMeasurements of the Cosmic Microwave Background (CMB) anisotropies and\, more recently\, of the distribution of galaxies at late times led us to the definition of a concordance cosmological model\, the so called LCDM model. Despite its phenomenological success\, several fundamental questions about the origin and fate of our Universe remain unanswered in the simplest LCDM scenario.  What mechanism\, if any\, has set up the initial conditions of the Universe? What is nature of Dark Energy? What is the value of neutrinos masses\, and are there any other light particles?\nSeveral upcoming experiments\, like DESI\, LSST and Simons Observatory\, promise to shed light on some of these misteries\, but will still be very far from the cosmic variance limit.\nIn fact most of the observable volume of the Universe lives at redshift z>2\,  where observing galaxies at high number densities becomes increasingly more difficult.\nA possible solution is offered by neutral hydrogen (HI)\, which is ubiquitous in our Universe at z<6. In emission\, HI can be mapped using the infamous 21 cm line at radio frequencies.\nIn this talk\, after summarizing the current status of 21 cm observations\, I will present the science case for a Stage-II 21 cm experiment targeting the redshift range 2