%0 Journal Article
%T The effects of a family nonuniversal Z ' boson on B -> pi pi decays
%A Chang, Q.
%A Li, X. Q.
%A Yang, Y. D.
%J International Journal of Modern Physics A
%D 2011
%V 26
%N 7-8
%I World Scientific Publ Co Pte Ltd
%@ 0217-751x
%G English
%F Chang_etal2011
%O ISI:000289175800004
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=595), last updated on Sat, 23 Apr 2011 15:28:08 +0000
%X Motivated by the measured large branching ratio of (B) over bar (0) --> pi(0)pi(0) (the so-called pi pi puzzle), we investigate the effects of a family nonuniversal Z' model on the tree-dominated B --> pi pi decays. We find that the Z' coupling parameter zeta(LR)(d) similar to 0.05 with a nontrivial new weak phase phi(L)(d) similar to -50 degrees, which is relevant to the Z' contributions to the QCD penguin sector Delta C-5, is needed to reconcile the observed discrepancy. Combined with the recent fitting results from B --> pi K, pi K* and rho K decays, the Z' parameter spaces are severely reduced but still not excluded entirely, implying that both the "pi pi" and "pi K" puzzles could be accommodated simultaneously within such a family nonuniversal Z' model.
%K B-physics
%K rare decays
%K beyond Standard Model
%R 10.1142/S0217751X11051573
%U http://arxiv.org/abs/arXiv:1003.6051
%U https://doi.org/10.1142/S0217751X11051573
%P 1273-1294