Improved Measurement of B+ --> rho+rho0 and Determination of the Quark-Mixing Phase Angle alpha - INSPIRE

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Improved Measurement of B+ --> rho+rho0 and Determination of the Quark-Mixing Phase Angle alpha

BaBar

Collaboration

Jan, 2009

7 pages

Published in:

Phys.Rev.Lett. 102 (2009) 141802

e-Print:

0901.3522 [hep-ex]

DOI:

10.1103/PhysRevLett.102.141802

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \rho}^{+}}{{\mathit f}_{{{0}}}{(980)}}

{{\mathit f}_{{{0}}}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

BABAR-PUB-08-053,
SLAC-PUB-13452

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (arXiv)

We present improved measurements of the branching fraction

{\cal B}

, the longitudinal polarization fraction

f_L

, and the direct {\ensuremath{CP}\xspace} asymmetry {\ensuremath{{\cal A}_{CP}}\xspace} in the

B

meson decay channel

B^+\to\rho^+\rho^0

. The data sample was collected with the {{\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}}} detector at SLAC. The results are {\cal B} (\Bp\ra\rprz)=(23.7\pm1.4\pm1.4)\times10^{-6},

f_L=0.950\pm0.015\pm0.006

, and \Acp=-0.054\pm0.055\pm0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the CKM weak phase angle

\alpha

to be

(92.4^{+6.0}_{-6.5})^{\circ}

.

Note:

7 pages, 2 figures, sumbitted to Phys. Rev. Lett

11.30.Er
13.25.Hw
12.15.Hh
polarization: longitudinal
B+: hadronic decay
B+: branching ratio
CKM matrix: unitarity
asymmetry: CP
isospin
BaBar

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Figures(2)

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