Effect of Z′-mediated flavor-changing neutral current on B → ππ decays

We study the effect of Z′-mediated flavor-changing neutral current on the B → ππ decays. The branching ratios of these decays can be enhanced remarkably in the nonuniversal Z′ model. Our estimated branching ratios B(B0 → π0π0) are enhanced significantly from their standard model (SM) value. For g′/g = 1, the branching ratios B(B0 → π0π0) are very close to the recently observed experimental values and for higher values of g′/g branching ratios are more. Our calculated branching ratios B(B0 → π+π−) and B(B+ → π+π0) are also enhanced from the SM value as well as the recently observed experimental values. These enhancements of branching ratios from their SM value give the possibility of new physics.