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Measurement of B0π+ππ+π decays and search for B0ρ0ρ0

C.-C. Chiang et al. (Belle Collaboration)
Phys. Rev. D 78, 111102(R) – Published 3 December 2008

Abstract

We report on a search for the decay B0ρ0ρ0 and other charmless modes with a π+ππ+π final state, including B0ρ0π+π, nonresonant B04π±, B0ρ0f0(980), B0f0(980)f0(980) and B0f0(980)π+π. These results are obtained from a data sample containing 657×106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e collider. We set an upper limit on B(B0ρ0ρ0) of 1.0×106 at the 90% confidence level (C.L.). From our B0ρ0ρ0 measurement and an isospin analysis, we determine the Cabibbo-Kobayashi-Maskawa phase ϕ2 to be 91.7±14.9 degrees. We find excesses in B0ρ0π+π and nonresonant B04π± with 1.3σ and 2.5σ significance, respectively. The corresponding branching fractions are less than 12.0×106 and 19.3×106 at the 90% C.L. In addition, we set 90% C.L. upper limits as follows: B(B0ρ0f0(980))<0.3×106, B(B0f0(980)f0(980))<0.1×106, and B(B0f0(980)π+π)<3.8×106.

  • Figure
  • Figure
  • Received 19 August 2008

DOI:https://doi.org/10.1103/PhysRevD.78.111102

©2008 American Physical Society

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Vol. 78, Iss. 11 — 1 December 2008

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