Form Factors and Long-Distance Effects in $B\to V(P) \ell^+\ell^-$ and $B\to V \gamma$

TL;DR

This paper reviews the hadronic inputs, form factors, and long-distance effects in rare B-meson decays to vector or pseudoscalar mesons, focusing on charm-loop contributions and their impact on decay amplitudes.

Contribution

It provides an overview of current form factor determinations and estimates of charm-loop effects in exclusive B-decays involving flavor-changing neutral currents.

Findings

Current status of B→P,V form factors summarized

Estimate of charm-loop effects in B→K(*)ℓ+ℓ− and B→K*γ discussed

Implications for theoretical predictions of rare B-decays

Abstract

I overview the hadronic input for the exclusive flavour-changing neutral-current $B$-decays with a vector ($V=K^*,\rho$) or pseudoscalar ($P=K,\pi$) meson in the final state. After presenting the current status of $B\to P,V$ form factors, I discuss the estimate of the charm-loop effect in $B\to K^{(*)} \ell^+\ell^-$ and $B\to K^* \gamma$.