We report the measurement of branching fractions and CP-violation asymmetries in B→ϕϕK decays based on a 711 fb^−1 data sample containing 772×10^6 BB¯ events. The data were recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. For B+→ϕϕK+, the branching fraction and CP-violation asymmetry measured below the η_c threshold (m_ϕϕ<2.85 GeV/c2) are [3.43+0.48−0.46(stat)±0.22(syst)]×10^−6 and −0.02±0.11(stat)±0.01(syst), respectively. Similarly, the branching fraction obtained for B0→ϕϕK0 below the ηc threshold is [3.02+0.75−0.66(stat)±0.20(syst)]×10^−6. We also measure the CP-violation asymmetry for B+→ϕϕK+ within the η_c region (m_ϕϕ∈[2.94,3.02]GeV/c2) to be +0.12±0.12(stat)±0.01(syst).
Measurement of branching fraction and search for CP violation in B→ϕϕK
Tenchini, F.;
2021-01-01
Abstract
We report the measurement of branching fractions and CP-violation asymmetries in B→ϕϕK decays based on a 711 fb^−1 data sample containing 772×10^6 BB¯ events. The data were recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. For B+→ϕϕK+, the branching fraction and CP-violation asymmetry measured below the η_c threshold (m_ϕϕ<2.85 GeV/c2) are [3.43+0.48−0.46(stat)±0.22(syst)]×10^−6 and −0.02±0.11(stat)±0.01(syst), respectively. Similarly, the branching fraction obtained for B0→ϕϕK0 below the ηc threshold is [3.02+0.75−0.66(stat)±0.20(syst)]×10^−6. We also measure the CP-violation asymmetry for B+→ϕϕK+ within the η_c region (m_ϕϕ∈[2.94,3.02]GeV/c2) to be +0.12±0.12(stat)±0.01(syst).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


