WIDG Seminar: Luna Zagorac, Yale, "Linear Approximations to UltraLight Dark Matter Stationary States"

UltraLight Dark Matter (ULDM) is an axion-like dark matter candidate with an extremely small particle mass. The dynamics of ULDM are governed by the Schrodinger-Poisson system of coupled differential equations for which the ground state solution is a spherically symmetric soliton. While a purely solitonic profile is incompatible with observational constraints on dark matter halos, mergers of ULDM solitons create halos with solitonic central cores, but with NFW-like behaviour at large radii.

SPECIAL DATE NPA Zoom Seminar, David Kawall, U Mass, "An anomaly in an anomaly? First results from the Fermilab Muon g-2 Experiment"

The Fermilab muon g-2 experiment just released its first measurement of the positive muon magnetic moment anomaly, a_mu = (g_mu-2)/2 to an accuracy of 0.46 ppm. The anomaly a_mu is of interest since it can be predicted with impressive precision and its value is sensitive, via quantum corrections, to the interactions of the muon with the other particles of the Standard Model. Comparison of measurement results and theoretical predictions tests the completeness of the Standard Model, and a significant discrepancy would indicate the need for new physics.

WIDG Seminar: Emily Kuhn, Yale, "Calibration Instrumentation for the Hydrogen Intensity and Real-time Analysis eXperiment"

The Hydrogen Intensity Real-time Analysis eXperiment (HIRAX) is a 21cm radio telescope array to be deployed in South Africa. It will consist of 1024 six meter parabolic dishes, and will map much of the southern sky over the course of four years. HIRAX is designed to improve constraints on the dark energy equation of state through measurements of large scale structure at high redshift, and will additionally monitor transients such as fast radio bursts (FRBs) and pulars, as is currently done with CHIME in the Northern Hemisphere.

WIDG Seminar: Jiaxiang Wang, Yale, "Progress on Probing Non-Newtonian Gravity using Levitated Microspheres"

Optomechanical systems can provide new methods to probe short-range dynamics due to their high precision and control. Previous work with these techniques has searched for millicharged particles and recoils from composite dark matter using levitated nanogram mass sensors, offering new results complementary to the large-scale experiments. In my talk I will present our progress on searching for non-Newtonian gravity-like interactions, including a possible Yukawa-like deviation from Newton’s law at micron distance.

NPA Zoom Seminar, Liliana Apolinario, LIP, Lisbon, "Novel Jet Reclustering Tools for Heavy-Ion Collisions"

The physics program of ultra-relativistic heavy-ion collisions at the Large Hadron Collider (LHC) and Relativistic Heavy-Ion Collider (RHIC) has brought a unique insight into the hot and dense QCD matter created in such collisions, the Quark-Gluon Plasma (QGP). Jet quenching, a collection of medium-induced modifications of the jets’ internal structure that occur through their development in dense QCD matter, has a unique potential to assess the time structure of the produced medium.

NPA Zoom Seminar, Sergei Gleyzer, University of Alabama and CERN, "Deep Learning for High-Energy Physics and Strong Gravitational Lensing Cosmology"

The Large Hadron Collider (LHC) is delivering the highest energy proton-proton collisions ever recorded in the laboratory, permitting a detailed exploration of elementary particle physics at the highest energy frontier. It is uniquely positioned to detect and measure the rare phenomena that can shape our knowledge of new interactions and possibly resolve the present tensions of the Standard Model.

NPA Zoom Seminar, Brian Lenardo, Stanford University, "Searching for New Physics with Liquid Xenon Time Projection Chambers"

The Standard Model of particle physics provides a remarkably predictive and well-tested theory for describing the interactions of the known elementary particles. However, the observed matter/antimatter asymmetry, the existence of small neutrino masses, and cosmological constraints on dark matter and dark energy point strongly to the existence of fundamental physics beyond the Standard Model. In the past few decades, ultra-low-background liquid xenon time projection chambers (TPCs) have emerged as a powerful experimental technique in the search for low energy signatures of new physics.

NPA Zoom Seminar, Arun Tadepalli, JLab, "The SeaQuest Experiment"

The Fermilab E906/SeaQuest is an experiment aimed at studying the anti-quark distributions of nucleons and nuclei. The experiment uses a 120 GeV/c proton beam extracted from the Main Injector at Fermilab to collide with various solid and cryogenic targets to study a variety of physics topics. The experiment takes advantage of the Drell-Yan process in order to probe specifically the high-x anti-quark distributions of the target nucleus.

NPA Zoom Seminar, Xiaoyue Li, Max Planck Institute, "Searching for axion dark matter with the dielectric haloscope MADMAX"

Axions emerge naturally from the Peccei-Quinn (PQ) mechanism which addresses the absence of CP violation in QCD; the axions produced through the “vacuum realignment mechanism” are also a good cold dark matter (CDM) candidate. Traditional cavity haloscope experiments such as ADMX and HAYSTAC have focused on the ~1-10 µeV mass range, leaving the theoretically well motivated mass range of ~100 µeV unexplored.

NPA Zoom Seminar, Pedro Ochoa-Ricoux, University of California at Irvine, "Latest Results from Daya Bay"

The Daya Bay Reactor Neutrino Experiment consists of eight identically designed antineutrino detectors placed underground at different baselines from six 2.9 GWth nuclear reactors in China. With the largest sample of reactor antineutrino interactions to date, and a tight control of systematic uncertainties, the experiment has world-leading precision for the determination of two neutrino oscillation parameters and the characterization of antineutrino emission from commercial nuclear reactors.

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