15th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2025) Madison Wisconsin June 9-13

Session

Joint Symmetries/EW and DM

Jun 10, 2025, 3:30 PM

Conveners

Joint Symmetries/EW and DM: Parallel 4

• Ben Broerman (Queen's University)

275. New Upper Bounds on Exotic Neutron Spin-Electron Spin Interactions via Neutron Spin Rotation Measurements in a Ferrimagnet

Thomas Mulkey

6/10/25, 3:30 PM

Tests of Symmetries and the Electroweak Interaction

Parallel session presentation

We report a search for exotic axial spin-dependent interactions between neutrons and electrons, which could signal new physics beyond the Standard Model. We employ a compensated ferrimagnetic target to realize a dense ensemble of polarized electrons with a magnetization that vanishes at a specific temperature, thereby enabling a sensitive search using polarized neutron spin rotation. This...

201. On the sensitivity of nuclear clocks to new physics

Gil Paz (Wayne State University)

6/10/25, 3:48 PM

Dark Matter

Parallel session presentation

The recent demonstration of laser excitation of the 8 eV isomeric state of thorium-229 is a significant step towards a nuclear clock. The low excitation energy likely results from a cancellation between the contributions of the electromagnetic and strong forces. Physics beyond the Standard Model could disrupt this cancellation, highlighting nuclear clocks' sensitivity to new physics.

It is...

213. Searching for millicharged particles at accelerator facilities with skipper-CCDs

Brenda Aurea Cervantes Vergara (Fermilab)

6/10/25, 4:06 PM

Dark Matter

Parallel session presentation

Millicharged particles (mCPs), with a fractional electric charge, appear in several extensions of the Standard Model. They have the potential to explain anomalies in particle physics and cosmology, and may even constitute a fraction of the dark matter. At accelerators, mCPs could be produced through several mechanisms such as meson decays, bremsstrahlung and Drell-Yan processes. Detecting...

98. Recent R&D results from the first dual phase xenon doped argon TPC

Jianyang Qi (UC San Diego)

6/10/25, 4:24 PM

Dark Matter

Parallel session presentation

Dual phase noble element detectors have demonstrated the strong ability to detect low energy ionization signals through strong electroluminescence in the gas. This amplifies the electron signal and makes the detection of individual electrons not only possible but also highly efficient. Two target nuclei, argon and xenon, are widely used in noble liquid detectors, with each having unique...

95. Studying Dark Matter with a Rotating Torsion Balance

Michael Ross (University of Washington)

Dark Matter

Parallel session presentation

The Eot-Wash group has been using torsion balances to test gravity and search for novel interactions for many years. We are nearing the end of a new data campaign with our upgraded rotating torsion balance. I will discuss two searches with the new experimental data: one testing for sub-gravitational strength interactions between dark matter and ordinary matter, and another searching for...