Exploring New Physics with PandaX-4T Low Energy Electronic Recoil Data

Area of Science:

• * Particle Physics
• * Astrophysics
• * Dark Matter Research

Background:

• * The Standard Model of particle physics may be incomplete, with new particles like axions proposed.
• * Axions and other exotic particles can interact with electrons, producing detectable signals.
• * Solar axions, neutrinos with anomalous magnetic moments, and dark photons are potential candidates for new physics.

Purpose of the Study:

• * To search for novel electronic recoil signals from various beyond-Standard-Model particles.
• * To utilize the PandaX-4T liquid xenon detector for sensitive experimental searches.
• * To establish competitive constraints on the properties and interactions of these hypothetical particles.

Main Methods:

• * Employed the PandaX-4T detector with a 1.54 ton-year exposure dataset.
• * Developed a detailed background model to accurately interpret experimental data.
• * Searched for an excess of electronic recoil events above the expected background.

Main Results:

• * No statistically significant excess of events was observed above the established background.
• * The experiment achieved competitive exclusion limits for several theoretical models.
• * Constraints were placed on axion couplings to electrons.
• * Limits were also set on neutrino magnetic moments and fermionic dark matter interactions.

Conclusions:

• * The PandaX-4T experiment has provided stringent constraints on new physics scenarios.
• * The absence of signals indicates that certain parameter spaces for these particles are disfavored.
• * This research contributes to the ongoing search for physics beyond the Standard Model.