Indications for Factorization and $Re V_{ub} < 0$ from Rare B Decay Data

TL;DR

This paper suggests that assuming a negative real part of V_{ub} in the factorization approximation better explains certain rare B decay data and predicts specific experimental outcomes.

Contribution

It proposes that taking Re V_{ub} as negative improves the consistency of factorization with observed B decay modes and predicts measurable differences in B factory and mixing data.

Findings

Factorization accounts for Kπ, ππ, and ρ^0π^+ data with negative Re V_{ub}

Predicted lower sin2β at B Factories with negative Re V_{ub}

B_s mixing near LEP bounds under the negative Re V_{ub} assumption

Abstract

Surveying known hadronic rare B decays, we find that the factorization approximation can give a coherent account of $K\pi$, $\pi\pi$ and $\rho^0\pi^+$ data and give predictions for $\omega^0\pi^+$, $\rho\pi$ and $K^*\pi$ modes, {\it if ${Re}V_{ub}$ is taken as negative} (in standard phase convention) rather than positive. As further confirmation, we expect a lower $\sin2\beta$ value at B Factories as compared to current fits, and $B_s$ mixing close to LEP bounds at SLD and CDF.