Improved measurement of the {CKM} angle alpha using $B^0 \to \rho^+ \rho^-$ decays - INSPIRE

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Improved measurement of the {CKM} angle alpha using $B^0 \to \rho^+ \rho^-$ decays

BaBar

Collaboration

Mar, 2005

7 pages

Published in:

Phys.Rev.Lett. 95 (2005) 041805

e-Print:

hep-ex/0503049 [hep-ex]

DOI:

10.1103/PhysRevLett.95.041805

PDG:

\alpha

Report number:

SLAC-PUB-11081,
BABAR-PUB-05-007

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract:

We present results from an analysis of B0 -> rho+rho- using 232 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II asymmetric-energy

B

Factory at SLAC. We measure the longitudinal polarization fraction f_L = 0.978 +- 0.014 (stat) +0.021 -0.029 (syst) and the CP-violating parameters SLong = -0.33 +- 0.24 (stat) +0.08 -0.14 (syst) and CLong = -0.03 +- 0.18 (stat) +- 0.09 (syst). Using an isospin analysis of B -> rho rho decays we determine the unitarity triangle alpha. The solution compatible with the Standard Model is alpha = (100 +- 13) degrees.

11.30.Er
12.15.Hh
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
rho(770): pair production
amplitude analysis: isospin

References(19)

Figures(0)

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