BELLE2-NOTE-PL-2021-006

Sensitivity studies on the lepton universality in the channel $\Upsilon(nS)\rightarrow \ell \ell$ via initial-state radiation

Gian Luca Pinna Angioni ; Umberto Tamponi

16 July 2021

Abstract: In this note, we present the results of sensitivity studies on the lepton universality in the channel ϒ(nS) → 𝓵𝓵 via initial-state radiation (ISR). The study is performed with Phase III Monte Carlo samples and cover an integrated luminosity range up to the design value of 50 ab−1. This work show that the even with the complete design dataset the statistical uncertainty is not reduced enough to have a competitive measurement.

Keyword(s): LFU ; Bottomonium ; Simulation ; ISR

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Belle II Notes (Public) > Belle II Notes : Approved plots