Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 81: Flavour physics IV

T 81.5: Talk

Thursday, March 18, 2021, 17:00–17:15, Tf

Search for the B → K^* νν decay at Belle II — •Jiyong Jeong and Thomas Kuhr — Ludwig-Maximilians-Universität München

The rare decay B → K^* νν is a flavor-changing neutral current process, which is suppressed in the standard model and thus sensitive to new physics contributions. We search for this decay in Υ(4S) events produced at the SuperKEKB e⁺e⁻ collider. B mesons are collected and reconstructed from Υ(4S) → BB decays. The K^* is reconstructed in the Belle II detector from its daughter kaon and pion particles. The missing energy and momentum of the neutrinos is inferred from the reconstructed second B meson in the event and the known beam energies. Monte-Carlo simulated data is applied to optimize the separation between signal and background and to estimate the sensitivity of the search.