Speaker: Cole Kampa (Northwestern U.) – Title: From Muon CLFV to Collider EFT: Advances in New Physics Searches

December 5 @ 4:00 pm - 5:00 pm

Research Progress Meeting

Date: December 5, 2024

Time: 4:00- 5:00 pm

Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]

Speaker: Cole Kampa (Northwestern U.)

Title: From Muon CLFV to Collider EFT: Advances in New Physics Searches

Abstract: Mu2e, the muon-to-electron conversion experiment at Fermilab, will search for Charged Lepton Flavor Violation (CLFV) – an accidental symmetry forbidden in the Standard Model (SM) of particle physics. Observing CLFV would provide unambiguous evidence of New Physics (NP) beyond the SM. I will briefly outline the experimental design and methodology of Mu2e, emphasizing ongoing efforts to ensure robust physics results. Notably, the introduction of an unbinned maximum likelihood fit has improved the expected sensitivity to Rμe, the muon-to-electron conversion rate, by up to 20%. On the apparatus side, a key component of the experiment is the tracking detector, which reconstructs electron trajectories in a uniform magnetic field. Studies of numerical calculations of the field suggest the calculations should predict the field with 1e-3 level accuracy. However, a 1e-4 level accuracy is required to distinguish signal electrons from the dominant muon decay-in-orbit (DIO) background. To meet this challenge, a custom field mapping apparatus is being developed. The measured field data will be modeled using a novel approach that combines least-squares fitting with a scalar physics-informed neural network (PINN), achieving a modeling fidelity significantly better than the 1e-4 accuracy requirement. I will conclude the CLFV discussion with an overview of two next-generation experiments: Mu2e-II and the Advanced Muon Facility (AMF).

The energy frontier offers a complementary path to NP discovery. Although direct searches at the Large Hadron Collider (LHC) have yet to yield definitive signs of NP, many efforts now focus on model agnostic approaches such as Effective Field Theory (EFT). Recently, the Compact Muon Solenoid (CMS) collaboration observed SM triboson (VVV) production. Building on this milestone, an ongoing CMS analysis employs an EFT framework to constrain heavy NP given the observed rate of VVV. I will conclude by discussing the statistical combination of the various final states being explored in this analysis.

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Details

Date:: December 5
Time:: 4:00 pm - 5:00 pm