# Study of electromagnetic dipole moment, electric quadrupole moment and weak T-odd (CP-odd) interactions of high energy short-lived particles in straight crystals

## TL;DR

This paper explores how particles moving through straight crystals can be used to measure electromagnetic dipole moments, electric quadrupole moments, and T-odd (CP-odd) interactions of short-lived high-energy particles, providing new methods beyond traditional laboratory techniques.

## Contribution

It introduces a novel approach to measure hyperon quadrupole moments and T-odd interactions using polarization and scattering in straight crystals, surpassing previous limitations.

## Key findings

- Potential to set new restrictions on EDM values.
- Method to measure hyperon quadrupole moments.
- Demonstrates polarization effects in crystal channeling.

## Abstract

A particle, which moves in a crystal, experiences weak interactions with electrons and nuclei alongside with electromagnetic interaction. Measuring the polarization vector and the angular distribution of charged and neutral particles scattered by axes (planes) of an unbent (straight) crystal enables to obtain restrictions for the EDM value and for {magnitudes} of constants describing T-odd (CP-odd) interactions Beyond the Standard Model. Spin rotation and polarization conversion from vector to tensor one and vice versa for a channelled in a crystal $\Omega^{\pm}$ hyperon enable measuring hyperon's quadrupole moment that is not possible to measure by use of laboratory available noncrystalline electric fields.