Study of the decay $B^0(\overline{B}^0) \to \rho^+ \rho^-$, and constraints on the CKM angle $\alpha$ - INSPIRE

DataBETA

Study of the decay $B^0(\overline{B}^0) \to \rho^+ \rho^-$ , and constraints on the CKM angle $\alpha$

BaBar

Collaboration

Apr, 2004

7 pages

Published in:

Phys.Rev.Lett. 93 (2004) 231801

e-Print:

hep-ex/0404029 [hep-ex]

DOI:

10.1103/PhysRevLett.93.231801

PDG:

{{\mathit B}^{0}}

\rightarrow

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

Report number:

SLAC-PUB-10399,
BABAR-PUB-04-09,
BABAR-PUB-04-009

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract:

Using a data sample of 89 million Y(4s)-->B0B0bar decays collected with the BaBar detector at the PEP-II asymmetric B Factory at SLAC, we measure the B0(B0bar)-->rho+rho- branching fraction as

(30\pm 4 stat \pm 5 syst) \times 10^{-6}

and a longitudinal polarization fraction of

f_L = 0.99 \pm 0.03 stat ^{+0.04}_{-0.03} syst

. We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as

C_L = -0.17\pm 0.27 stat \pm 0.14 syst

and

{S_L} = -0.42 \pm 0.42 stat \pm 0.14 syst

. We present constraints on the CKM angle

\alpha

.

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
rho(770): pair production
B0: branching ratio
polarization: longitudinal
amplitude analysis: CP
asymmetry: time dependence

References(26)

Figures(0)

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