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Abstract:
The magnetic and electric dipole moments (MDM and EDM) of charm baryons have yet to be measured. These fundamental properties are sensitive probes of non-perturbative QCD dynamics and potential signatures of physics beyond the Standard Model. The proposed ALADDIN experiment at the LHC aims to perform the first direct measurement of charm baryon dipole moments by exploiting spin precession in bent crystals, within a dedicated fixed-target setup.
In this novel scheme, protons from the LHC beam halo are steered by a bent crystal ("crystal kicker") onto a tungsten target, producing charm baryons with energies up to the TeV scale. These baryons are then captured and channeled by a second bent crystal, where their spins undergo precession under strong electromagnetic fields — allowing the extraction of their dipole moments.
A recent proof-of-principle test, TWOCRYST, has successfully demonstrated the viability of this two-crystal configuration in the LHC environment. These results are a key step in validating the experimental concept and guiding the optimization of the ALADDIN setup.
In this talk, I will present the physics case for ALADDIN, detail the experimental technique and detector concept, and provide an update on ongoing detector R&D efforts. I will also report on recent results from the TWOCRYST test, which mark a significant milestone toward realizing this ambitious measurement program.
About the speaker:
Nicola Neri is Professor of Physics at the University of Milan. He earned both his Master’s degree and Ph.D. in Physics from the University of Pisa. Before his current position, he was a researcher at INFN and held Scientific Associate appointments at CERN. His research focuses on flavor physics, CP violation, spectroscopy and precision tests of the Standard Model using heavy hadrons. He has contributed to major international experiments, including the BaBar collaboration at SLAC and the LHCb experiment at CERN, where he has taken leading roles in physics analyses and silicon tracking detector development. Professor Neri has been the Principal Investigator of the ERC-funded project SELDOM aimed at measuring dipole moments of strange and charm baryons. He currently serves as Spokesperson of the ALADDIN collaboration, which is developing a novel fixed-target experiment at the LHC to probe charm baryon dipole moments via spin precession in bent crystals.
zoom link: https://cern.zoom.us/j/63929986275?pwd=jtD8xnUArHka36L0bQg6LRBaswpv9X.1
zoom ID: 639 2998 6275
password: 250924