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Prospects for searches of b→ sνν¯ decays at FCC-ee

Journal of High Energy Physics, ISSN: 1029-8479, Vol: 2024, Issue: 1
2024
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Article Description

We investigate the physics reach and potential for the study of various decays involving a b→ sνν¯ transition at the Future Circular Collider running electron-positron collisions at the Z-pole (FCC-ee). Signal and background candidates, which involve inclusive Z contributions from bb¯ , cc¯ and uds final states, are simulated for a proposed multi-purpose detector. Signal candidates are selected using two Boosted Decision Tree algorithms. We determine expected relative sensitivities of 0.53%, 1.20%, 3.37% and 9.86% for the branching fractions of the B→ Kνν¯ , Bs0→ϕνν¯ , B0→KS0νν¯ and Λb0→Λνν¯ decays, respectively. In addition, we investigate the impact of detector design choices related to particle-identification and vertex resolution. The phenomenological impact of such measurements on the extraction of Standard Model and new physics parameters is also studied.

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