Bulletin of the American Physical Society
20th Annual Meeting of the APS Northwest Section
Volume 64, Number 9
Thursday–Saturday, May 16–18, 2019; Western Washington University, Bellingham, Washington
Session H2: Particle Physics |
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Chair: Andrew Larkoski, Reed College Room: Communications Facility 120 |
Saturday, May 18, 2019 3:30PM - 4:00PM |
H2.00001: Hidden Sectors and Long-Lived Particle Searches at the LHC Invited Speaker: Gordon Watts Hidden Sectors are a compelling extension to the Standard Model, and long Lived particles are a common feature of Hidden Sector theories. This talk will review recent results of searches for long-lived particles, focusing on the most recent results. The talk will also briefly touch on future prospects, including new detectors proposed to take advantage of the LHC’s expected 4 ab$^-1$ in High Luminosity LHC expected to start in 2026. [Preview Abstract] |
Saturday, May 18, 2019 4:00PM - 4:30PM |
H2.00002: Looking for New Fundamental Forces in the Cosmos Invited Speaker: David Morrissey New gauge forces are predicted by many theories of new fundamental physics beyond the Standard Model of particle physics. If the a gauge force has a mass gap and interacts on very weakly with regular matter, the corresponding gauge boson (or bound states derived from it) can decay in the early universe. Specific examples include dark photons derived from a new Abelian gauge invariance and dark glueball boundstates arising from an exotic non-Abelian gauge invariance. In this talk I will discuss how cosmological observations such as measurements of the cosmic microwave background radiation and the primordial light element abundances can be used to probe such new forces. Along the way, I will also describe an improved calculation of the effects of electromagnetic energy injection below 1 GeV on nucleosynthesis and describe how it is qualitatively different from injection at higher energies. [Preview Abstract] |
Saturday, May 18, 2019 4:30PM - 4:42PM |
H2.00003: Direct neutrino mass measurements in the KATRIN experiment Menglei Sun The absolute neutrino mass scale plays an important role in cosmology, particle physics and astrophysics. The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at a direct and model-independent determination of the neutrino mass with 0.2 eV (90\% C.L.) sensitivity via ultrahigh precision measurements of the kinematics of tritium beta decay. It combines an ultra-luminous molecular windowless tritium source with a high resolution MAC-E-filter based spectrometer. After many years of construction and commissioning runs, KATRIN has started long-term scans of the tritium spectrum close to the endpoint. This talk will give an overview of the experiment and its current status, as well as a summary of recent results. [Preview Abstract] |
Saturday, May 18, 2019 4:42PM - 4:54PM |
H2.00004: The Transition to Hard Scattering: Using the SLAC 8 GeV Spectrometer to Probe Nucleon Structure, 1969-1974 Michael Riordan The year 2019 can be viewed as the 50th anniversary of the discovery of quarks, as two pivotal papers on deep-inelastic electron-proton scattering were published in Physical Review Letters that October. But it took another five years before the physics community became fully convinced that quarks existed. A pivotal detector involved in this discovery process was the SLAC 8 GeV Spectrometer facility, on which I performed my MIT Ph.D. and postdoctoral research. Unlike the 20 GeV Spectrometer used in the initial inelastic electron-scattering experiments, it could readily roll out to large angles and detect electrons that had scattered at high momentum transfers q-squared, enabling experimenters to test and confirm the structure-function scaling predictions of Bjorken and Feynman — which proved crucial in verifying the suggested point-like nucleon substructure. This highly flexible detector allowed physicists their first detailed look at the new “hard-scattering” regime discussed by Andrew Pickering in his 1984 book "Constructing Quarks." If time permits, I will discuss the use of this spectrometer in separating the two nucleon structure functions W1 and W2 and, equivalently, determining the ratio R = sigma(L)/sigma(T), which was the subject of my Ph.D. thesis and later research. [Preview Abstract] |
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