Searching for D⁰ → π⁺π^- ν ν decays and measuring angular asymmetries in polarised Λ_c⁺ → p μ⁺μ^- decays at FCC-ee

2025/09/15 by Hacheney, Tabea, Röhrig, Lars, Mitzel, Dominik Stefan +2

paper · doi:10.17181/grqps-e5862

Abstract

This note presents sensitivity studies for the rare charm decays D⁰ → π⁺π^- ν ν and Λ_c⁺ → p μ⁺μ^- at FCC-ee, when operated at the Z pole with 6 × 10¹² produced Z bosons. The results indicate that an observation of the decay D⁰ → π⁺π^- ν ν  with a significance of 5(3)σ could be possible for branching fractions at the level of [1.8 - 2.1] × 10^-7 ([2.9-3.4] × 10^-7). Angular asymmetries in Λ_c⁺ → p μ⁺μ^- could be measured in decays of polarized Λ_c⁺ baryons with a precision of 0.9%. The precision expected at FCC-ee allows for the parameter space of a large class of motivated BSM models to be constrained significantly.

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