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Report

Teaser, summary, work performed and final results

Periodic Reporting for period 1 - SELDOM (Search for the electric dipole moment of strange and charm baryons at LHC)

Teaser

Summary

SELDOM explores a new experimental method to decisively boost the study of the electric dipole moment (EDM) and magnetic dipole moment (MDM) of baryons at the LHCb experiment at CERN.

SELDOM will be a crucial piece in the puzzle to explain the absence of antimatter in the Universe, and it has the potential to shorten the path to new physics discoveries opening up new research opportunities.

The ultimate goals of SELDOM are: i) first search for charm baryon EDM; ii) search for the Î› baryon EDM with improved sensitivity with respect to the current limit.

SELDOM would contribute to the search of new physics through the search of the EDM of unstable particles, and also to the understanding of the mechanism of baryogenesis.

Work performed

In the framework of the SELDOM project significant achievements have already been reached in the first 7 months of activity:

i) development of new tracking and trigger algorithms for long-lived Î› baryons using simulated events; reconstruction of Î›c+â†’pKâˆ’Ï€+ charm baryon decays in p-Ne fixed-target collisions at LHCb;

ii) development of an amplitude analysis of Î›c+â†’pKâˆ’Ï€+ decays in pp collisions; design of the analysis for determining the polarisation of Î›c+ baryons produced in p-Ne fixed-target collisions;

iii) design and simulation studies of fixed-target collisions; construction of long bent crystals (8cm long, 16 mrad bending angle) and successful test on beam at the CERN SPS. The latter represents a major achievement of the project.

In addition a new experiment for the measurement of the tau lepton dipole moments was conceived and recently published in a journal article, Phys. Rev. Lett. 123, 011801 (2019).

Final results

The project is expected to produce significant progress beyond the state of art:

i) development of a new generation of long-bent crystals for channeling and spin precession of TeV particles;

ii) realisation of a new fixed-target experiment at the LHC;

iii) improved understanding of the dynamics of charm baryon decays with amplitude analyses;

iv) first cross-section and polarisation measurements of charm baryons produced in fixed-target collisions at the LHC;

v) first MDM measurements for charm baryons;

vi) development of new tracking and trigger algorithms for the reconstruction of long-lived particles at LHCb;

vii) new branching ratio and polarisation measurements of Î› baryons from weak charm decays;

viii) measurement of the Î› and anti-Î› baryon MDM for a test of the CPT symmetry.