Evidence for the B0->rho0rho0 Decay and Implications for the CKM Angle alpha

2006/07/28 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Radioactive Decay and Measurement Techniques

paper · pdf · doi:10.48550/arxiv.hep-ex/0607097

openalex publication_date 2006/07/28 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 348 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.0 sigma significance and measure the branching fraction B = (1.16 +0.37-0.36 +-0.27) 10^-6 and longitudinal polarization fraction f_L = 0.86 +0.11-0.13 +-0.05. As a consequence, the uncertainty on the CKM unitarity angle alpha due to penguin contributions in B->rhorho decays is estimated to be 18 degrees at 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates. All results are preliminary.

Related

• Search for the Decay B0 --> rho0rho0
• Time-Dependent Analysis of the Decay B0 --> rho0 rho0
• Updated Measurement of the CKM Angle alpha Using B0->rho+rho- Decays
• Evidence For B0 -> rho0 K0S
• Measurements related to CKM angle alpha in BABAR