PT Journal
AU Chang, Q
   Li, XQ
   Yang, YD
TI The effects of a family nonuniversal Z ' boson on B -> pi pi decays
SO International Journal of Modern Physics A
JI Int. J. Mod. Phys. A
PY 2011
BP 1273
EP 1294
VL 26
IS 7-8
DI 10.1142/S0217751X11051573
LA English
DE B-physics; rare decays; 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.
ER