The Prelude to the QCD Revolution
The is the historical talk I gave at the \50 Years of QCD" conference at UCLA last September. I describe the revolution in particle physics between 1962 and 1972 that led up to the formulation of QCD and the discovery of asymptotic freedom in 1973. The talk focuses on James Bjorken's seminal 1966 paper on the \Applications of the Chiral U(6)U(6) Algebra of Current Densities", the discoveries that led up to it, the confusion in the theory community that ensued, and the emergence of the quark-gluon paradigm that became QCD.
Precision measurements are having a moment: recent results in g-2 and electric dipoles of leptons
The past three years have seen three dipole-moment measurements of record-breaking accuracy – the magnetic dipole moments (aka “g-2”) of the muon and of the electron, and the electric dipole moment (EDM) of the electron. I will focus in on the latter measurement, performed at the University of Colorado. Then I will try to compare and contrast the relative implications of all these three measurements for the search for Beyond Standard Model physics.
Particle Colliders: Ultimate Limits and The Course Ahead
Particle colliders, indispensable tools for high-energy physics, are celebrating 60 years this spring. While the Large Hadron Collider and the Super-KEKB factory represent the frontier of hadron and lepton colliders today, respectively, future colliders are an essential component of a strategic vision for particle physics. Conceptual studies and technical developments for several exciting near- and medium-term future collider options are underway internationally.
Analysis of numerous proposals and studies for far-future colliders indicates the limits of collider beam technology due to machine size, cost, and power consumption. This calls for a paradigm shift in particle physics research at ultra-high energy but low luminosity colliders approaching or exceeding a 1 PeV center-of-mass energy scale.
The U.S. and international community of particle physicists and collider builders have defined the most important questions for the field and identified promising opportunities to address them. I will discuss the major recommendations of the Snowmass’21 Accelerator Frontier and briefly overview the key accelerators/colliders recommendations of the decadal report of the P5, Particle Physics Project Prioritization Panel (Dec. 2023).