@Article{Chang_etal2011,
author="Chang, Q.
and Li, X. Q.
and Yang, Y. D.",
title="The effects of a family nonuniversal Z {\textquoteright} boson on B -> pi pi decays",
journal="International Journal of Modern Physics A",
year="2011",
publisher="World Scientific Publ Co Pte Ltd",
volume="26",
number="7-8",
pages="1273--1294",
optkeywords="B-physics; rare decays; beyond Standard Model",
abstract="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{\textquoteright} model on the tree-dominated B --> pi pi decays. We find that the Z{\textquoteright} 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{\textquoteright} 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{\textquoteright} parameter spaces are severely reduced but still not excluded entirely, implying that both the {\textquoteleft}{\textquoteleft}pi pi{\textquoteright}{\textquoteright} and {\textquoteleft}{\textquoteleft}pi K{\textquoteright}{\textquoteright} puzzles could be accommodated simultaneously within such a family nonuniversal Z{\textquoteright} model.",
optnote="ISI:000289175800004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=595), last updated on Sat, 23 Apr 2011 15:28:08 +0000",
issn="0217-751x",
doi="10.1142/S0217751X11051573",
opturl="http://arxiv.org/abs/arXiv:1003.6051",
opturl="https://doi.org/10.1142/S0217751X11051573",
archivePrefix="arXiv",
eprint="arXiv:1003.6051",
language="English"
}