Effects of Final-state Interactions on Mixing-induced CP Violation in Penguin-dominated B Decays
| dc.creator | Cheng, Hai-Yang | |
| dc.creator | Chua, Chun-Khiang | |
| dc.creator | Soni, Amarjit | |
| dc.date | 2005-02-25 | |
| dc.date | 2005-05-16 | |
| dc.date.accessioned | 2026-07-07T10:29:26Z | |
| dc.date.available | 2026-07-07T10:29:26Z | |
| dc.description | Motivated by the recent indications of the possibility of sizable deviations of the mixing-induced CP violation parameter, $S_f$, in the penguin-dominated $b\to sq\bar q$ transition decays such as $B^0\to (ϕ,ω,ρ^0,η',η,π^0,f_0)K_S$ from $\sin 2β$ determined from $B\to J/ψK_S$, we study final-state rescattering effects on their decay rates and CP violation. Recent observations of large direct CP asymmetry in modes such as $B^0\to K^+π^-,ρ^-π^+$ means that final state phases in 2-body B decays may not be small. It is therefore important to examine these long-distance effects on penguin-dominated decays. Such long-distance effects on $S_f$ are found to be generally small [i.e. ${\cal O}(1-2%)$] or negligible except for the $ωK_S$ and $ρ^0K_S$ modes where $S_f$ is lowered by around 15% for the former and increased by the same percentage for the latter. However, final-state rescattering can enhance the $ωK_S, ϕK_S, η'K_S, ρ^0K_S$ and $π^0K_S$ rates significantly and flip the signs of direct CP asymmetries of the last two modes. Direct CP asymmetries in $ωK_S$ and $ρ^0K_S$ channels are predicted to be $\A_{ωK_S}\approx -0.13$ and $\A_{ρ^0K_S}\approx 0.47$, respectively. However, direct CP asymmetry in all the other $b\to s$ penguin dominated modes that we study is found to be rather small (a few percents), rendering these modes a viable place to search for the CP-odd phases beyond the standard model. | |
| dc.description | 23 pages, 1 figure. Table I is updated with the new Belle measurements. Detailed discussions on theoretical uncertainties are given and their numerical estimates are included in Tables II-V. CP asymmetries in the modes ρ^0 K_S and ηK_S are also discussed. We clarify and stress that merging with QCDF does not cause a double counting problem | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0502235 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0502235 | |
| dc.identifier | Phys.Rev.D72:014006,2005 | |
| dc.identifier | doi:10.1103/PhysRevD.72.014006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177800 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Effects of Final-state Interactions on Mixing-induced CP Violation in Penguin-dominated B Decays | |
| dc.type | text |