Search for Lorentz and CPT violation effects in Muon spin precession

Area of Science:

• * Fundamental physics
• * Particle physics
• * High-energy physics

Background:

• * The Standard Model of particle physics describes fundamental particles and forces.
• * Lorentz and CPT symmetries are foundational principles in physics.
• * Deviations from these symmetries could indicate new physics beyond the Standard Model.

Purpose of the Study:

• * To search for evidence of Lorentz and CPT symmetry violation.
• * To analyze the spin precession frequency of muons in the (g-2) storage ring.
• * To set limits on parameters within the Standard Model Extension (SME).

Main Methods:

• * Analysis of muon spin precession frequency data from the (g-2) storage ring.
• * Search for a nonzero difference in spin precession frequencies between positive and negative muons.
• * Investigation of the sidereal variation in muon spin precession frequency.

Main Results:

• * No statistically significant evidence for Lorentz and CPT violation was detected.
• * Upper limits were placed on SME parameters, including bZ and (m mu dZ0 + HXY).
• * Stringent 95% confidence level limits were established for transverse SME parameters b perpendicular mu+ and b perpendicular mu-.

Conclusions:

• * The experimental data are consistent with Lorentz and CPT symmetry.
• * The study provides the most stringent constraints to date on certain SME parameters.
• * Future experiments can further probe these fundamental symmetries with improved precision.