Branching fractions and CP asymmetries in $B^0 \to \pi^0 \pi^0$, $B^+ \to \pi^+ \pi^0$ and $B^+ \to K^+ \pi^0$ decays and isospin analysis of the $B \to \pi \pi$ system - INSPIRE

DataBETA

Branching fractions and CP asymmetries in $B^0 \to \pi^0 \pi^0$ , $B^+ \to \pi^+ \pi^0$ and $B^+ \to K^+ \pi^0$ decays and isospin analysis of the $B \to \pi \pi$ system

BaBar

Collaboration

Dec, 2004

7 pages

Published in:

Phys.Rev.Lett. 94 (2005) 181802

e-Print:

hep-ex/0412037 [hep-ex]

DOI:

10.1103/PhysRevLett.94.181802

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{0}}

Report number:

SLAC-PUB-10902,
BABAR-PUB-04-02,
BABAR-PUB-04-042

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract:

Based on a sample of 227 million BBbar pairs collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0 -> pi0pi0) = (1.17 +- 0.32 +- 0.10) x 1e-6, and the asymmetry C(pi0pi0) = -0.12 +- 0.56 +- 0.06. The B0 -> pi0pi0 signal has a significance of 5.0 sigma. We also measure B(B+ -> pi+pi0) = (5.8 +- 0.6 +- 0.4) x 1e-6, B(B+ -> K+pi0) = (12.0 +- 0.7 +- 0.6) x 1e-6, and the charge asymmetries A(pi+pi0) = -0.01 +- 0.10 +- 0.02 and A(K+pi0) = 0.06 +- 0.06 +- 0.01. Using isospin relations we find an upper bound on the angle difference |alpha - alpha(eff)| of 35 degrees at the 90% C.L.

11.30.Er
12.15.Hh
13.25.Hw
B mesons
meson hadronic decay
CP invariance
electroweak theories
standard model
electron positron: colliding beams
electron positron: annihilation

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