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 varLambda baryons, selected from weak decays of charm baryons produced in p p collisions at LHC, can be determined by studying the spin precession in the magnetic field of the detector tracking system. A test of C!PT symmetry can be performed by measuring the magnetic dipole moment of varLambda and overline{varLambda } baryons. For short-lived {varLambda } ^+_{c} and {varXi } ^+_{c} baryons, to be produced in a fixed-target experiment using the 7 mathrm {,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.
Highlights
The experimental searches for the electric dipole moment (EDM) of fundamental particles provide powerful probes for physics beyond the Standard Model (SM)
We propose to search for charm baryon EDMs in a dedicated fixed-target experiment at the LHC to be installed in front of the LHCb detector, as close as possible to the VELO detector
The unique possibility to search for the EDM of strange and charm baryons at LHC is discussed, based on the exploitation of large statistics of baryons with large Lorentz boost and polarization
Summary
The experimental searches for the electric dipole moment (EDM) of fundamental particles provide powerful probes for physics beyond the Standard Model (SM). EDM searches of fundamental particles rely on the measurement of the spin precession angle induced by the interaction with the electromagnetic field. For unstable particles this is challenging since the precession has to take place before the decay. No experimental measurements exist for short-lived charm baryons since negligibly small spin precession would be induced by magnetic fields used in current particle detectors. We propose to search for the EDM of short-lived charm baryons produced by interaction of the 7 TeV LHC proton beam on a fixed target and channeled in a bent crystal in front of the LHCb detector. This research would extend the physics program of the proposed experiment [34,35] for the measurement of charm baryon MDMs
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