title: Fourth generation CP violation effects on B-->Kpi, phiK, and rhoK in next-to-leading-order perturbative QCD.
abstract: We study the effect from a sequential fourth generation quark on penguin-dominated two-body nonleptonic B meson decays in the next-to-leading order perturbative QCD formalism. With an enhancement of the color-suppressed tree amplitude and possibility of a new CP phase in the electroweak penguin amplitude, we can account better for A(CP)(B(0)-->K+ pi-)-A(CP)(B+-->K+ pi0). Taking |V(t's)V(t'b)| approximately 0.02 with a phase just below 90 degrees, which is consistent with the b-->sl+ l- rate and the B(s) mixing parameter Deltam(B)(s), we find a downward shift in the mixing-induced CP asymmetries of B(0)-->K(S)(pi 0) and phi(K)(S). The predicted behavior for B(0)-->rho(0)(K)(S) is opposite.
authors.affiliation: Department of Physics, National Taiwan University, Taipei, Taiwan 106, Republic of China.
authors.forename: Wei-Shu
authors.initials: WS
authors.lastname: Hou
authors.forename: Hsiang-nan
authors.initials: HN
authors.lastname: Li
authors.forename: Satoshi
authors.initials: S
authors.lastname: Mishima
authors.forename: Makiko
authors.initials: M
authors.lastname: Nagashima