• Weak Supervision for RFI Mitigation in 21-cm Cosmology

    Seminar
    Room 112 (Watanabe Hall)
    Journal Club

    Speakers: Dr Shawn Dubey Detecting the redshifted 21-cm signal from the early universe requires separating an extremely faint cosmological signal from bright foreground emission and terrestrial radio-frequency interference (RFI), but flagging RFI is a big challenge. I will describe our use of weak supervision, a method that combines multiple imperfect flaggers to construct training labels ... Read more

  • A Tour of Tools, Trends, and Tradeoffs in AI/ML for High Energy Physics

    Colloquia
    Watanabe 112
    Colloquium

    Speakers: Dr Shawn Dubey (Brown University) Machine Learning (ML) has advanced rapidly over the past decade, transforming the way data-intensive sciences are conducted. High energy physics is distinctive among the physical sciences in its early adoption and deployment of new AI/ML methods, driven by extreme data volumes, complex event structures, and stringent real-time constraints. In ... Read more

  • (N.B. special date and time) First Observation of the Migdal Effect in Neutron Nucleus Scattering

    Colloquia
    WAT 422A
    Colloquium

    Speakers: Prof. Yangheng Zheng (Chinese Academy of Sciences) Using a sensitive detection system developed by the MigdAl pRocess Validation by nEutruaL scattering (MERVEL) collaboration team, which combines a micropattern gasous detector with a semiconductor pixel readout chip, the apparatus effectively functions as a camera capable of imaging the single‑atom electron‑emission process. Using neutron–nucleus scattering, the team made ... Read more

  • Status and Plans for the University of Hawai’i electron linac

    Watanabe 112
    Colloquium

    Speakers: Asst. Prof. Niels Bidault (University of Hawaii at Manoa) The electron beam linear accelerator (linac) at the Free Electron Laser (FEL) Laboratory at the University of Hawai‘i at Mānoa is currently undergoing recommissioning. The facility was originally installed and operated under the direction of Prof. John Madey, pioneer of FEL science. The accelerator provides ... Read more

  • Quantum sensors for rare-event searches: the eyes do more than see

    Seminar
    Watanabe 112
    Journal Club

    Speakers: Peter Sorensen (Lawrence Berkeley National Laboratory) I will discuss recent results from PandaX, XENONnT and LZ, with an emphasis on the effect of instrumental backgrounds on the recent physics searches. I will then discuss recent results from the TESSERACT Collaboration, again emphasizing the effect of instrumental backgrounds and the so-called low-energy excess (LEE). I ... Read more

  • Detectability of dark matter subhalos in Milky Way stellar streams

    Seminar
    Watanabe 112
    Seminar

    Speakers: Tongyan Lin (University of California, San Diego) Stellar streams are a promising way to probe the gravitational effects of low-mass dark matter (DM) subhalos. In recent years, there has been a remarkable explosion in the number of stellar streams detected in the Milky Way, and hundreds more may be discovered with future surveys such ... Read more

  • Constraining dark matter density profiles with dwarf galaxy kinematics: the 2D and the 6D story

    Seminar
    Watanabe 112
    Seminar

    Speakers: Dr Isabelle Goldstein (Texas A&M University) The stellar kinematics in dwarf galaxies can provide a wealth of information about its underlying dark matter distribution. Line-of-sight velocity dispersion measurements from six classical dwarf galaxies can be used to show that axion-like particles with masses of order m ~ 10^(−22) eV are inconsistent with the potential distribution in ... Read more

  • Searching for Quantum Decoherence of B Meson Entanglement at the Belle II Experiment

    Colloquia
    Watanabe 112
    Colloquium

    Speakers: Sven Vahsen (University of Hawaii) Why does a world governed by quantum mechanics look classical on everyday scales? One of the central ideas in addressing this question is quantum decoherence. In this colloquium, I will introduce these ideas from the perspective of experimental particle physics, at a level intended to be accessible to physics ... Read more

  • The Launch of GAPS in Antartica and NA61 Physics Runs at CERN

    Colloquia
    Watanabe 112
    Colloquium

    Speakers: Philip von Doetinchem (University of Hawaii) The precise measurement of cosmic-ray antinuclei is an important means of identifying the nature of dark matter and other beyond-standard-model physics. Recent years have shown that identifying the nature of dark matter with cosmic-ray positrons and antiprotons is difficult, and this has led to a significantly increased interest ... Read more