Measurement of the Branching Fraction and the CP-Violating Asymmetry for the Decay B0 --> K0S Pi0

Abstract

We measure the branching fraction and the CP-violating asymmetry of $B^0\to K_s^0{\pi }^0$ decays with 227 million ${\rm Y}(4S)\to B\bar{B}$ events collected with the BaBar detector at the PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider at SLAC. We obtain a branching fraction $\mathcal{B}(B^0\to K^0{\pi }^0)=(11.4\pm 0.9\pm 0.6)\times 10^{-6}$ and CP-violating asymmetry parameters $C_{K_s^0{\pi }^0}=0.06\pm 0.18\pm 0.03$ and $S_{K_s^0{\pi }^0}=0.35_{-0.33}^{+0.30}\pm 0.04$, where the first error is statistical and the second systematic.

7 pages, 2 postscript figures, submitted to PRL

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• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Anatomy of Prominent B and K Decays and Signatures of CP-Violating New Physics in the Electroweak Penguin Sector
• Measurements of the Branching Fraction and CP-Violation Asymmetries in B^0-->f0(980)Ks
• Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay
• Measurements of CP-violating Asymmetries in $B^0\to K_s^0{\pi }^0$ Decays
• Branching Fractions and CP Asymmetries in B0 --> K+ K- K0S and B+ --> K+ K0S K0S

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• Observation of B+ --> K0bar K+ and B0 --> K0 K0bar
• Polarization States in B -> rho K* and New Physics
• Upper bounds on SUSY contributions to b to s transitions from B_s - B_sbar mixing
• The $b\to s$ penguin amplitude in charmless $B\to PP$ decays
• Measurement of time dependent CP asymmetry parameters in B0 meson decays to omega K0S, eta'K0, and pi0K0S
• $B_s$ Mixing and New Physics in hadronic $b\to s\bar{q}q$ transitions
• The 2-3 symmetry: Flavour Changing $b$, $\tau$ Decays and Neutrino Mixing
• Measurements of time-dependent CP violation in $B^0\to \omega K_S^0$, $f_0(980)K_S^0$, $K_S^0{\pi }^0$ and $K^{+}{K}^{-}{K}_S^0$ decays
• Improved measurements of branching fractions for B -> K pi and B -> pi pi decays
• Measurement of Time-Dependent CP-Violating Asymmetries in $B_0\to K_s{K}_s{K}_s$ Decay
• Investigating The Physics Case of Running a B-Factory at the Y(5S) Resonance
• Supersymmetric Contributions to Bs->K+K-
• Measurement of the CP-Violating Asymmetries in B0 -> KS pi0 and of the Branching Fraction of B0 -> K0 pi0
• Measurement of B Decays to phi K gamma
• Search for the decay B0 --> K0_S K0_S K0_L
• Branching Fraction and CP Asymmetries of $B^0\to K_S^0{K}_S^0{K}_S^0$