BABAR Publications

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PLOT-0053 Measurement of Time-dependent CP-Violating Asymmetries in B0 -> Ks pi0 decays

Doc Type

Public Plots or Figures

Record Created

August 3, 2003

Comments

Preliminary result presented at Lepton Photon Conference, 2003

Abstract

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We present a measurement of the time-dependent CP asymmetries S_kspi0
and C_kspi0 extracted from B0->Ks pi0 decays in sample of
approximately 124 million BB pairs, corresponding to $113\invfb$. In
the Standard Model S_kspi0=sin 2beta and C_kspi0=0 to good precision.
Using a multi-dimensional maximum likelihood fit we find $122 \pm 16$
signal decays with S_kspi0 = 0.48 +0.38 -0.47 (stat) +/- 0.11 (syst),
C_kspi0 = 0.40 +0.27 -0.28 (stat) +/- 0.10 (syst).  Fixing C_kspi0=0
we measure C_kspi0 = 0.41 +0.41 -0.48 (stat) +/- 0.11 (syst).

Revisions and Files

1 revised August 3, 2003

File Date Thumbnails	File Name	File Type	File Format	File Size (Kb)	Comments
08-AUG-2003	abs.txt	Abstract	txt	0.52	Short description of analysis and results.
08-AUG-2003	deltae-projplot.eps	Figure or plot	eps	30.88	Likelihood projection plot of delta E for events which are likely to be signal. The dashed line represents the backgroud. There are approximately 75 signal and 66 background events in this plot.
08-AUG-2003	dtasymmetryproj.eps	Figure or plot	eps	30.38	Likelihood projection of Delta t for B0 (top), B0bar (middle), and asymmetry (bottom) for a signal enhanced sample. The dashed curves represent bkg. There are 16 sig and 14 bkg events in the B0 plot and 20 sig and 11 bkg in the B0Bar plot.
08-AUG-2003	mes-projplot.eps	Figure or plot	eps	37.58	Likelihood projection of mes for signal enhanced sample. Dashed curve represents bkg. Nsig=63, NBkg=253.

Submitted To	2003 International Symposium on Lepton and Photon Interactions at High Energies