Branching Ratio and CP Asymmetry of $B \to πη^{(\prime)}$ Decays in the Perturbative QCD Approach
| dc.creator | Wang, Huisheng | |
| dc.creator | Liu, Xin | |
| dc.creator | Xiao, Zhenjun | |
| dc.creator | Guo, Libo | |
| dc.creator | Lü, Cai-Dian | |
| dc.date | 2005-11-14 | |
| dc.date | 2005-11-20 | |
| dc.date.accessioned | 2026-07-07T11:04:53Z | |
| dc.date.available | 2026-07-07T11:04:53Z | |
| dc.description | We calculate the branching ratios and CP-violating asymmetries for $B^0 \to π^0 η^{(\prime)}$ and $B^+\to π^+ η^{(\prime)}$ decays in the perturbative QCD (pQCD) factorization approach here. We not only calculate the usual factorizable contributions, but also evaluate the non-factorizable and annihilation type contributions. Besides the current-current operators, the contributions from the QCD and electroweak penguin operators are also taken into account. The pQCD results for the CP-averaged branching ratios are $Br(B^+ \to π^+ η) \approx 4.1 \times 10^{-6}$, $Br(B^+ \to π^+ η^\prime) \approx 2.4 \times 10^{-6}$, and $Br(B^0 \to π^0 η^{(\prime)}) \approx 0.2 \times 10^{-6}$, which agree very well with the measured values or currently available experimental upper limits. We also predict large CP-violating asymmetries in these decays: $A_{CP}^{dir}(π^\pm \etap)\sim A_{CP}^{dir}(π^0 \etap)\sim -0.35 $, and $A_{CP}^{mix}(π^0 \etap)\sim 0.67$, but with large errors. The pQCD prediction for $A_{CP}^{dir}(π^\pm η)$ ($A_{CP}^{dir}(π^\pm η^\prime))$ has the same (opposite) sign with the primary measured values. Further improvements in both theory and experiments are needed to clarify this discrepancy. | |
| dc.description | 28 pages, 8 figures, several typos corrected | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0511161 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0511161 | |
| dc.identifier | Nucl.Phys.B738:243-268,2006 | |
| dc.identifier | doi:10.1016/j.nuclphysb.2006.01.021 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/189047 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Branching Ratio and CP Asymmetry of $B \to πη^{(\prime)}$ Decays in the Perturbative QCD Approach | |
| dc.type | text |