Measurements of Charmless Hadronic b->s Penguin Decays in the pi+pi-K+pi- Final State and First Observation of B0 -> rho0K+pi-

Abstract

We report measurements of charmless hadronic B^0 decays into the pi+pi-K+pi+ final state. The analysis uses a sample of 657x10^6 BBbar pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at the Y(4S) resonance. The decay B^0 -> rho0 Kpi is observed for the first time; the significance is 5.0sigma and the corresponding partial branching fraction for M_Kpi in (0.75,1.20) GeV/c^2 is [2.8 +- 0.5(stat) +-0.5(syst)] x 10^{-6}. We also obtain the first evidence for B^0 -> f0Kpi with 3.5sigma significance and for B^0 -> pi+pi-K*0 with 4.5sigma significance. For the two-body decays B^0 -> rho0K*0 and B^0 -> f0K*0, the significances are 2.7sigma and 2.5sigma, respectively, and the upper limits on the branching fractions are 3.4x10^{-6} and 2.2x10^{-6} at 90% confidence level.

arXiv comment6 pages, 3 figures. accepted by PRD(RC)

References in corpus (26)

• Penguin Enhancement and $B\to K\pi$ decays in perturbative QCD
• Kernel Estimation in High-Energy Physics
• Branching fractions, polarisation and asymmetries of B -> VV decays
• Evidence for B0->pi0pi0
• Measurement of Polarization and Triple-Product Correlations in B -> phi K^* Decays
• Observation of B+ -> rho+ rho0
• High statistics study of f_0(980) resonance in gamma gamma --> pi^+ pi^- production
• Constraints on the CKM Angle $\gamma$ and Strong Phases from $B\to \pi K$ Decays
• Final state interactions for B => VV charmless decays
• Observation of CP Violation in B0 -> K+pi- and B0 -> pi+pi-
• A Study of B0 to rho+rho- Decays and Constraints on the CKM Angle alpha
• Enhanced electroweak penguin amplitude in B-->VV decays
• Polarization States in B -> rho K* and New Physics
• Measurement of the branching fraction, polarization, and CP asymmetry for B0->rho+rho- decays, and determination of the CKM phase phi_2
• Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in B --> rho K* and B --> f0(980) K* decays
• Measurements of Branching Fractions and Polarization in B > K^* rho Decays
• Study of $B\to K^{\ast }\rho ,K^{\ast }\omega$ Decays with Polarization in Perturbative QCD Approach
• Amplitude Analysis of the B+- ->phi K*(892)+- Decay
• Improved Measurement of $B^{+}\to {\rho }^{+}{\rho }^0$ and Determination of the Quark-Mixing Phase Angle $\alpha$
• Flavor SU(3) Symmetry and Factorization in B Decays to Two Charmless Vector Mesons
• Observation of B^+ Meson Decays to a1(1260)^+ K^0 and B^0 to a1(1260)^- K^+
• Hadronic B decays in the MSSM with large tan(beta)
• Measurement of $B^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ Decays and Search for $B^0\to {\rho }^0{\rho }^0$
• Measurements of the Branching Fractions of B0 --> K^*0K+K-, B0 --> K^*0pi+K-, B0 --> K*0K+pi-, and B0 --> K*0pi+pi-
• Evidence for Neutral B Meson Decays to wK*0
• Generalized analysis on $B\to K^{\ast }\rho$ within and beyond the Standard Model $-$ Can it help understand the $B\to K\pi$ puzzle?

Cited by in corpus (8)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• B0 meson decays to rho0 K*0, f0 K*0, and rho-K*+, including higher K* resonances
• Study of the four-body decays $B_S^0\to \pi \pi \pi \pi$ in the perturbative QCD approach
• $CP$-violating observables in four-body $B\to \varphi (\to K\bar{K})K^{\ast }(\to K\pi )$ decays
• Single-file diffusion on self-similar substrates
• The virtual contributions from $K^{\ast }$ in the $B\to K^{\ast }\pi h$ and $B\to K\rho h$ decays