Speaker
Description
In the recent years, several measurements of $B$-decays with flavor changing neutral currents (FCNC), i.e. $b\to s \ell \ell$ transitions, hint at deviations from the Standard Model (SM) predictions.
A search for the flavor-changing neutral current decay $B^{+}→K^{+}\nu\bar{\nu}$ is performed with data sample corresponding to $63~fb^{−1}$ collected at the Υ(4S) resonance by the Belle II experiment. A novel measurement method is developed, which exploits topological properties of the decay that differ from both generic B-meson decays and light-quark pair-production. This inclusive tagging approach has the benefit of a higher signal efficiency compared to previous searches for this rare decay. As no significant signal is observed, an upper limit on the branching fraction of $B^{+}→K^{+}\nu\bar{\nu}$ = $4.1 \times 10^{−5}$ is set at the 90% confidence level. We will talk about this novel analysis technique and the result.
| First author | Jim Libby |
|---|---|
| libby@iitm.ac.in | |
| Collaboration / Activity | Belle II |
