Search

Within the QCD factorization framework, we investigate the branching fractions and the directCPasymmetries of decaysB→K0*1430ρωandB→K0*1430ϕunder two different scenarios in the standard model and the family nonuniversalZ′model. We find that the annihilation terms play crucial roles in these decays and lead to the major uncertainties. For decaysB-→K0*-1430ρ0ω, the newZ′boson could change the branching fractions remarkably. However, for other decays, its contribution might be clouded by large uncertainties from annihilations. Unfortunately, neither the standard model nor theZ′model can reproduce all experimental data simultaneously under one certain scenario. We also noted that the directCPasymmetries ofB-→K0*-1430ρ0ωcould be used to identify theK0*1430meson and search for the contribution of newZ′boson.

Within the QCD factorization formalism, we study the possible impacts of the nonuniversal ${Z}^{\ensuremath{'}}$ model, which provides a flavor-changing neutral current at the tree level, on rare decays $B\ensuremath{\rightarrow}{K}_{0}^{*}(1430)\ensuremath{\pi}$. Under two different scenarios, Scenerio-1 (S1) and Scenerio-2 (S2), for identifying the scalar meson ${K}_{0}^{*}(1430)$, the branching ratios, $CP$ asymmetries, and isospin asymmetries are calculated in both the standard model and the family nonuniversal ${Z}^{\ensuremath{'}}$ model. We find that the branching ratios and $CP$ asymmetries are sensitive to weak annihilation. In the standard model, with ${\ensuremath{\rho}}_{A}=1$ and ${\ensuremath{\phi}}_{A}\ensuremath{\in}[\ensuremath{-}30\ifmmode^\circ\else\textdegree\fi{},30\ifmmode^\circ\else\textdegree\fi{}]$, the branching ratios of S1 (S2) are smaller (larger) than the experimental data. Adding the contribution of the ${Z}^{\ensuremath{'}}$ boson in two different cases (Case I and Case II), for S1, the branching ratios are still far away from experiment. For S2, in Case II, the branching ratios become smaller and can accommodate the data; in Case I, although the center values are enhanced, they can also explain the data with large uncertainties. Similar conclusions are also reached for $CP$ asymmetries. Our results indicate that S2 is more favored than S1, even after considering new physics effects. Moreover, if there exists a nonuniversal ${Z}^{\ensuremath{'}}$ boson, Case II is preferred. All results can be tested in the LHC-b experiment and forthcoming super-$B$ factory.