2018/11/06 by Jing-Juan Qi, Zhen-Yang Wang, Xin-Heng Guo +2 · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.99.076010
published as Phys. Rev. D 99, 076010 (2019) · arXiv admin note: text overlap with arXiv:0704.1049 by other authors
arxiv created 2018/11/06 · arxiv updated 2019/04/24
In this work, we study the localized CP violation in B-→ K-π+π- and B-→ K- σ(600) decays by employing the quasi two-body QCD factorization approach. Both the resonance and the nonresonance contributions are studied for the B-→ K-π+π- decay. The resonance contributions include those not only from [ππ] channels including σ(600), ρ0(770) and ω(782) but also from [Kπ] channels including K^*(892), K0^*(1430), K^*(1410), K^*(1680) and K2^*(1430). By fitting the experimental data \mathcalACP(K-π+π-)=0.678±0.078±0.0323±0.007 for mK-π+2<15 GeV2 and 0.08<mπ+π-2<0.66 GeV2, we get the end-point divergence parameters in our model, ϕS ∈ [4.75, 5.95] and ρS∈[4.2, 8]. Using these results for ρS and ϕS, we predict that the CP asymmetry parameter \mathcalACP ∈ [-0.094, -0.034] and the branching fraction B ∈ [1.82, 20.0]×10-5 for the B-→ K-σ(600) decay. In addition, we also analyse contributions to the localized CP asymmetry \mathcalACP(B-→ K-π+π-) from [ππ], [Kπ] channel resonances and nonresonance individually, which are found to be \mathcalACP(B-→ K-[π+π-] → K-π+π-)=0.585±0.045, \mathcalACP(B-→ [K-π+] π→ K-π+π-)=0.086±0.021 and \mathcalACPNR(B-→ K-π+π-)=0.061±0.0042, respectively. Comparing these results, we can see that the localized CP asymmetry in the B-→ K-π+π- decay is mainly induced by the [ππ] channel resonances while contributions from the [Kπ] channel resonances and nonresonance are both very small.