2nd Topics of Particle, Astro and Cosmo Frontiers (TOPAC 2024)

$B$ meson anomalies and large $B^{+}\to K^{+}\nu\bar{\nu}$ in non-universal $U(1)^\prime$ models

2 Jun 2024, 11:45

25m

206 Southeast Col. (东南院206)

Oral talk Flavor

Speaker

CRISTIAN FELIPE SIERRA FONSECA (Nanjing Normal University)

Description

In view of both the latest LHCb measurement of $R_{K^{(*)}}$ and the new $2.7\sigma$ deviation reported by Belle II on $B^{+}\to K^{+}\nu\bar{\nu}$ decays, we present a fit to the $B$ meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal $U(1)^{\prime}$ extensions of the SM, without flavour violation, fail to simultaneously fit those observables and corroborate that they can modify $\mathrm{BR}(B^{+}\to K^{+}\nu\bar{\nu})$ up to only a $10\%$. In view of this deficit, we propose a new way in which those models can accommodate the data at tree level by introducing lepton flavour violating couplings and non-diagonal elements of the charged lepton mixing matrix, with implications in future charged lepton flavour violation searches.

Presentation materials

NNU_TOPAC_talk.pdf