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X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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DTSTART;TZID=America/Los_Angeles:20171130T160000
DTEND;TZID=America/Los_Angeles:20171130T170000
DTSTAMP:20260416T065255
CREATED:20170807T104500Z
LAST-MODIFIED:20170807T104500Z
UID:605-1512057600-1512061200@rpm.physics.lbl.gov
SUMMARY:Syed haider Abidi (University of Toronto) "Measurement of Higgs Boson Properties & ITk Detector Development"
DESCRIPTION:Abstract:\nDuring Run 1 of LHC\, the ATLAS and CMS collaboration firmly established the existence of a Higgs boson but detailed measurements were limited by statistical precision. With the larger Run 2 dataset\, we have measured the couplings and production cross-section of the Higgs boson using the H->ZZ->4l decay channel. The results improve upon the previous ones by more than a factor of 2. For the first time\, we also measure the differential cross-section within production modes and use it to place constraints on Beyond Standard Model scenarios.\nATLAS has an extensive detector upgrade plan to allow itself to collect and exploit the data delivered during HL-LHC. The upgrade of the current inner track with the all- silicon ITk is the largest project. At University of Toronto\, we have lead the Canadian effort to establish ITk strip module assembly. Collaborating with Celestica\, we have also established ASIC gluing and wire-bonding processes in industry. Additionally\, we are probing the impact of radiation damage to estimate the end-of-life performance of the ITk.\nBio:\nAs I have done my undergraduate training in Engineering Science\, I have been interested in bringing this prospective to physics research. As such I have been involved in many research projects\, ranging from condensed matter to accelerator development.\nSince 2013\, I have focused on measurements of Higgs boson properties using the ATLAS detector and ITk detector development. I have lead and been involved in numerous analyses using the H->ZZ->4l channel and analyses combining results from various other decay channels. Additionally I have led the development and investigation of ITk modules at University of Toronto. In the future\, I intend to continue pursuing both physics analyses and detector hardware.
URL:https://rpm.physics.lbl.gov/event/reserved-55/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20171207T160000
DTEND;TZID=America/Los_Angeles:20171207T170000
DTSTAMP:20260416T065255
CREATED:20170807T104554Z
LAST-MODIFIED:20170807T104554Z
UID:609-1512662400-1512666000@rpm.physics.lbl.gov
SUMMARY:Daniel Baxter (Northwestern University) Probing the Dark Sector: The Quest for a Background-Free Detector
DESCRIPTION:Abstract:\nDark matter represents one of the most sought after discoveries in physics. Leading theories predict that extremely sensitive detectors could probe nuclear recoils from dark matter interactions. The PICO collaboration uses bubble chambers to look for the energy deposition from such an interaction. The biggest challenge in searching for dark matter is the mitigation and understanding of the numerous other sources of events that could look like dark matter\, namely radioactive backgrounds. I will discuss how a long effort to understand backgrounds in the PICO bubble chambers led to the recent background-free result of PICO-60 and how discoveries made along the way might affect other rare event searches.\nBio:\nDaniel Baxter is a graduating 5th year PhD student at Northwestern University and active member of the international PICO collaboration searching for dark matter using bubble chamber detectors. His research has largely focused on dark matter detector calibration\, specifically understanding differences in detector response between nuclear and electron recoils. He has applied this expertise to the PICO-60 detector as run coordinator of its first physics run\, which became the first background-free run of a bubble chamber at the 40L scale.
URL:https://rpm.physics.lbl.gov/event/reserved-57/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20171212T160000
DTEND;TZID=America/Los_Angeles:20171212T170000
DTSTAMP:20260416T065255
CREATED:20170807T104630Z
LAST-MODIFIED:20170807T104630Z
UID:611-1513094400-1513098000@rpm.physics.lbl.gov
SUMMARY:Michaela Queitsch-Maitland (DESY) Title: "Precision measurements of Higgs boson production and the search for dark matter in ttbar events at the LHC"
DESCRIPTION:Abstract: \n“Despite the huge success of the Standard Model (SM)\, there is overwhelming evidence for physics beyond the SM and many remaining questions\, such as the nature of dark matter (DM). The current leading candidate for DM are Weakly Interacting Massive Particles (WIMPs)\, which could be produced directly at colliders.\nIn this talk I will discuss complimentary methods for exploring new phenomena at the LHC with the ATLAS experiment. Firstly\, through precision measurements of the Higgs boson properties\, and secondly though the production of missing transverse energy in association with pairs of top quarks.\nFinally\, I will discuss the High Luminosity LHC (HL-LHC) project and the ATLAS inner tracker (ITk) upgrade\, focusing on characterising the end-of-lifetime performance and validations of material budget estimates.”
URL:https://rpm.physics.lbl.gov/event/reserved-58/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20171219T110000
DTEND;TZID=America/Los_Angeles:20171219T120000
DTSTAMP:20260416T065255
CREATED:20170807T104434Z
LAST-MODIFIED:20170807T104434Z
UID:603-1513681200-1513684800@rpm.physics.lbl.gov
SUMMARY:Luise Poley (Humboldt U.) "Testbeam studies for the ATLAS ITk strip tracker"
DESCRIPTION:Abstract\nDuring Long Shutdown 3 (2024/2025) of the Large Hadron Collider\, the ATLAS Inner Detector will be replaced with a new all-silicon tracker\, composed of a pixel and a strip tracker. The strip tracker will consist of 18\,000 detector modules\, each comprised of a silicon strip sensor with readout electronics glued on to its surface. \nExtensive quality assurance and quality control programmes have been established for module components as well as combined structures in order to ensure high reliability and efficiency. Among different methods to test components and modules\, measurements in particle beams (testbeams) provide operating conditions similar to the LHC and thus are critical for understanding the detector performance. \nThis talk presents measurements performed using an electron beam at the DESY-II testbeam facility and X-ray photons at the Diamond Light Source. The results show the influence of different sensor architectures on the module performance\, how testbeams can improve the understanding of material distribution in the detector and how these measurements can benefit the future ATLAS detector. \nBIO:\nI have studied at the Humboldt-Universität zu Berlin\, where I worked on ATLAS analysis (b-tagging efficiencies) for my bachelor thesis. I joined the ITk strip tracker project in 2012\, when I started to work at DESY for my master thesis and later for my PhD. Since 2015\, I have participated in all ITk testbeam activities at DESY and organised nine testbeams myself.
URL:https://rpm.physics.lbl.gov/event/reserved-54/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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