Synchrotron-Like Radiation Beyond The Standard Model I: Hunting for new physics with the Sokolov-Ternov effect

Abstract

Electron and positron beams in storage-rings self-polarize by emitting spin-flipping synchrotron radiation. If new ultralight particles couple to $e^{\pm }$, their emission in synchrotron-like radiation would modify the characteristic self-polarization time. We calculate the rate of spin-flipping synchrotron-like radiation in several simplified models, and find that the largest contribution is for an axial-vector. We use polarization time measurements from the Swiss-Light-Source, and SPEAR3 to set new strong limits on ultralight axial-vectors coupled to $e^{\pm }$.

18 pages, 1 figure

References in corpus (6)

• Light Dark Matter: Models and Constraints
• Discovering leptonic forces using non-conserved currents
• Axions and Axion-Like Particles
• Quasiperiodic spin-orbit motion and spin tunes in storage rings
• Accurate and efficient spin integration for particle accelerators
• A Monte-Carlo simulation of the equilibrium beam polarization in ultra-high energy electron (positron) storage rings