TY  - JOUR
AU  - Chang, Q.
AU  - Li, X. Q.
AU  - Yang, Y. D.
PY  - 2011
DA  - 2011//
TI  - The effects of a family nonuniversal Z ' boson on B -> pi pi decays
T2  - Int. J. Mod. Phys. A
JO  - International Journal of Modern Physics A
SP  - 1273
EP  - 1294
VL  - 26
IS  - 7-8
PB  - World Scientific Publ Co Pte Ltd
KW  - B-physics
KW  - rare decays
KW  - beyond Standard Model
AB  - 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.
SN  - 0217-751x
UR  - http://arxiv.org/abs/arXiv:1003.6051
UR  - https://doi.org/10.1142/S0217751X11051573
DO  - 10.1142/S0217751X11051573
LA  - English
N1  - ISI:000289175800004
ID  - Chang_etal2011
ER  -