We calculate the important next-to-leading-order (NLO) contributions to the B→KK∗ decays from the vertex corrections, the quark loops, and the magnetic penguins in the perturbative QCD (pQCD) factorization approach. The pQCD predictions for the CP-averaged branching ratios are Br(B+→K+Kˉ∗0)≈3.2×10−7, Br(B+→Kˉ0K∗+)≈2.1×10−7, Br(B0/\ovB0→K0Kˉ∗0+Kˉ0K∗0)≈8.5×10−7, Br(B0/\ovB0→K+K∗−+K−K∗+)≈1.3×10−7, which agree well with both the experimental upper limits and the predictions based on the QCD factorization approach. Furthermore, the CP-violating asymmetries of the considered decay modes are also evaluated. The NLO pQCD predictions for \acp(B+→K+Kˉ∗0) and \acp(B+→K∗+Kˉ0) are \acpdir(K+Kˉ∗0)≈−6.9 and \acpdir(K∗+Kˉ0)≈6.5.
@article{arxiv.0807.2022,
title = {NLO contributions to $B \to K K^*$ Decays in the pQCD approach},
author = {Zhi-Qing Zhang and Zhen-Jun Xiao},
journal= {arXiv preprint arXiv:0807.2022},
year = {2009}
}