Measurement of the branching fraction, polarization, and CP asymmetry for B0 ---> rho+ rho- decays, and determination of the CKM phase phi(2) - INSPIRE

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Measurement of the branching fraction, polarization, and CP asymmetry for B0 ---> rho+ rho- decays, and determination of the CKM phase phi(2)

Belle

Collaboration

Jan, 2006

10 pages

Published in:

Phys.Rev.Lett. 96 (2006) 171801

e-Print:

hep-ex/0601024 [hep-ex]

DOI:

10.1103/PhysRevLett.96.171801

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit \rho}^{+}}{{\mathit \rho}^{-}}

Report number:

BELLE-PREPRINT-2006-3,
KEK-PREPRINT-2005-94,
UCHEP-06-01

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search106 citations

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Abstract:

We have measured the branching fraction B, longitudinal polarization fraction f_L, and CP asymmetry coefficients A and S for B0->rho+rho- decays with the Belle detector at the KEKB e+e- collider using 253 fb-1 of data. We obtain B = [22.8 +-3.8 (stat) +2.3 -2.6 (syst) ] x 10-6, f_L = 0.941 +0.034 -0.040 (stat) +-0.030 (syst), A = 0.00 +-0.30 (stat) +-0.09 (syst), and S = 0.08 +-0.41 (stat) +-0.09 (syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase phi_2: the solution consistent with the Standard Model is phi_2 = (88 +-17) degrees or 59 deg.< phi_2 < 115 deg. at 90% CL.

11.30.Er
12.15.Hh
13.25.Hw
polarisation in elementary particle interactions
CP invariance
B mesons
meson hadronic decay
standard model
electron positron: colliding beams
electron positron: annihilation

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