Journal article

Measurement of B-0 -> pi( )pi(-)pi( )pi(-) decays and search for B-0 -> rho(0)rho(0)

C-C Chiang, I Adachi, H Aihara, K Arinstein, V Aulchenko, T Aushev, AM Bakich, I Bedny, V Bhardwaj, U Bitenc, A Bozek, M Bracko, TE Browder, P Chang, Y Chao, A Chen, BG Cheon, R Chistov, I-S Cho, S-K Choi Show all



We report on a search for the decay B0→ρ0ρ0 and other charmless modes with a π+π-π+π- final state, including B0→ρ0π+π-, nonresonant B0→4π±, B0→ρ0f0(980), B0→f0(980)f0(980) and B0→f0(980)π+π-. These results are obtained from a data sample containing 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We set an upper limit on B(B0→ρ0ρ0) of 1.0×10-6 at the 90% confidence level (C.L.). From our B0→ρ0ρ0 measurement and an isospin analysis, we determine the Cabibbo-Kobayashi-Maskawa phase 2 to be 91.7±14.9 degrees. We find excesses in B0→ρ0π+π- and nonresonant B0→4π± with 1.3σ and 2.5σ significance, respectively. The corresponding branching fractions ar..

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Funding Acknowledgements

We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the NII for valuable computing and SINET3 network support. We acknowledge support from MEXT and JSPS (Japan); ARC and DEST (Australia); NSFC (China); DST (India); MOEHRD, KOSEF, and KRF (Korea); KBN (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA).