A Study of B0 ---> rho+ rho- Decays and Constraints on the CKM Angle alpha - INSPIRE

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A Study of B0 ---> rho+ rho- Decays and Constraints on the CKM Angle alpha

BaBar

Collaboration

May, 2007

25 pages

Published in:

Phys.Rev.D 76 (2007) 052007

e-Print:

0705.2157 [hep-ex]

DOI:

10.1103/PhysRevD.76.052007

PDG:

{{\mathit B}^{0}}

\rightarrow

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

Report number:

SLAC-PUB-12498,
BABAR-PUB-07-14,
BABAR-PUB-07-014

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (arXiv)

We present results from an analysis of B0 to rho+rho- decays using 383.6 million BB-bar pairs collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. The measurements of the B0 to rho+rho- branching fraction, longitudinal polarization fraction f_L, and the CP-violating parameters S_{long} and C_{long} are: B(B0-> rho+rho-) = (25.5 +/- 2.1 (stat) +3.6/-3.9 (syst))*10^-6 f_L = 0.992 +/- 0.024 (stat) +0.026/-0.013 (syst) S_{long} = -0.17 +/- 0.20 (stat) +0.05/-0.06 (syst) C_{long} = 0.01 +/- 0.15 (stat) +/- 0.06 (syst) We determine the unitarity triangle angle alpha, using an isospin analysis of B to rhorho decays. One of the two solutions, alpha = [73.1, 117.0] degrees at 68% CL is compatible with standard model-based fits of existing data. Constraints on the unitarity triangle are also evaluated using an SU(3) symmetry based approach.

Note:

25 pages, submitted to PRD

12.39.St
14.40.Nd
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
rho(770): pair production
B0: branching ratio

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