Improved measurement of CP-violating parameters in rho+rho- decays

Details Improved measurement of CP-violating parameters in rho+rho- decays Improved measurement of CP-violating parameters in rho+rho- decays

2007-02-02

arxiv.org/abs/hep-ex/0702009v3

Phys.Rev.D76:011104,2007

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures, presented at JPS/DPF 2006 (Added KEK, BELLE preprint numbers, submitted to PRD(RC))

Scientific paper

10.1103/PhysRevD.76.011104

We present a measurement of the CP-violating asymmetry in rho+rho- decays using 535 million BBbar pairs collected with the Belle detector at the KEKB e+e- collider. We measure CP-violating coefficients A = 0.16 +- 0.21(stat) +- 0.07 (syst) and S = 0.19 +- 0.30(stat) +- 0.07 (syst}. These values are used to determine the unitarity triangle angle phi_2 using an isospin analysis; the solution consistent with Standard Model lies in the range 53 < phi_2 < 114 deg. at 90 C.L.

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