On the search for the electric dipole moment of strange and charm baryons at LHC

TL;DR

This paper proposes a novel method to measure the electric dipole moments of strange and charm baryons at the LHC, aiming to detect physics beyond the Standard Model through spin precession studies.

Contribution

It introduces a new experimental approach using LHCb and bent crystal techniques to measure EDMs of short-lived baryons, extending current EDM searches.

Findings

Potential to improve EDM sensitivity at LHC

Feasibility of using spin precession in bent crystals

Proposed experimental setup and expected sensitivities

Abstract

Permanent electric dipole moments (EDMs) of fundamental particles provide powerful probes for physics beyond the Standard Model. We propose to search for the EDM of strange and charm baryons at LHC, extending the ongoing experimental program on the neutron, muon, atoms, molecules and light nuclei. The EDM of strange Lambda baryons, selected from weak decays of charm baryons produced in pp collisions at LHC, can be determined by studying the spin precession in the magnetic field of the detector tracking system. A test of CPT symmetry can be performed by measuring the magnetic dipole moment of Lambda and anti-Lambda baryons. For short-lived Lambdac+ and Xic+ baryons, to be produced in a fixed-target experiment using the 7 TeV LHC beam and channeled in a bent crystal, the spin precession is induced by the intense electromagnetic field between crystal atomic planes. The experimental layout based on the LHCb detector and the expected sensitivities in the coming years are discussed.