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Measurement of the Branching Fraction, Polarization, and CP Asymmetries in B0->rho0rho0 Decay, and Implications for the CKM Angle alpha

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arxiv 0807.4977 v1 pith:26JYEP4K submitted 2008-07-31 hep-ex

The BaBar Collaboration , B. Aubert , et al This is my paper · ORCID
classification hep-ex
keywords fractionrho0rho0alphaanglebranchingdecaylongitudinalmeasure
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We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Anomalies in Hadronic $B \to VV$ Decays

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Charmless B→VV decays under SU(3)_F show 5.2σ tension for ρ,K* modes and >7σ when ϕ and ω are included, while isospin-only ρK* fits remain acceptable.

  2. Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$

    hep-ex 2024-12 accept novelty 4.0 of 10

    Belle II reports B(B0 -> rho+ rho-) = (2.89 +0.23/-0.22 +0.29/-0.27) x 10^-5, f_L = 0.921 +0.024/-0.025 +0.017/-0.015, S = -0.26 +/- 0.19 +/- 0.08, C = -0.02 +/- 0.12 +0.06/-0.05, and a derived phi2 = (92.6 +4.5/-4.7)...

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