Predictions of Angular Observables for $\bar{B}_s\to K^{\ast}\ell\ell$ and $\bar{B}\to \rho\ell\ell$ in Standard Model

TL;DR

This paper predicts angular observables for specific $b o d$ semileptonic B meson decays within the Standard Model, aiming to compare with $b o s$ anomalies and explore potential new physics signals.

Contribution

It provides detailed Standard Model predictions for $b o d$ transitions, including CP violation effects, to complement existing $b o s$ decay analyses.

Findings

Predictions for angular observables in $ar{B}_s o K^{ ext{*}} ext{l} ext{l}$ and $ar{B} o ho ext{l} ext{l}$ decays.

Inclusion of $B^0-ar{B}^0$ mixing effects in the $ar{B}^0 o ho^0 ext{l} ext{l}$ mode.

Results applicable to Belle and LHCb experiments.

Abstract

Exclusive semileptonic decays based on $b\to s$ transitions have been attracting a lot of attention as some angular observables deviate significantly from the Standard Model (SM) predictions in specific $q^2$ bins. B meson decays induced by other Flavor Changing Neutral Current (FCNC), $b\to d$, can also offer a probe to new physics with an additional sensitivity to the weak phase in Cabibbo-Kobayashi-Masakawa (CKM) matrix. We provide predictions for angular observables for $b\to d$ semileptonic transitions, namely $\bar{B}_s\to K^{\ast}\ell^+\ell^-$, $\bar{B}^0\to\rho^0 \ell^+\ell^-$, and their CP-conjugated modes. For $\bar{B}^0\to\rho^0 \ell^+\ell^-$ mode, $B^0-\bar{B}^0$ mixing effects have been included and predictions are made for Belle and LHCb separately. Study of these decay modes will be useful in its own right and to understand the pattern of deviations in $b\to s$ transitions.