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CONF-05/013 Measurements of Branching Fractions for B0 -> pi+pi-, K+pi-, and Search for B0 -> K+K-

Doc Type

Conference Submissions

Record Created

June 23, 2005

SLAC-PUB

SLAC-PUB-11433 No citations

Preprint #

hep-ex/0508046

Abstract

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We present preliminary measurements of branching fractions for the charmless 
two-body decays B0 -> pi+pi- and K+pi-, and a search for B0 -> K+K- using a 
data sample of approximately 227 million $\BB$ decays.  Signal yields are 
extracted with a multi-dimensional maximum likelihood fit, and the efficiency 
is corrected for the effects of final-state radiation.  We find the
charge-averaged branching fractions (in units of 10^{-6}):

Br(B0 -> pi+pi-) = 5.5 +- 0.4 +- 0.3,
Br(B0 -> K+pi-)  = 19.2 +- 0.6 +- 0.6,
Br(B0 -> K+K-)   = < 0.40.

The errors are statistical followed by systematic, and the upper limit on
K+K- represents a confidence level of 90%.

Revisions and Files

1 revised June 23, 2005

File Date Thumbnails	File Name	File Type	File Format	File Size (Kb)	Comments
06-JUL-2005	abstract.txt	Abstract	txt	0.66
06-JUL-2005	bkg de splot.eps	Figure or plot	eps	12.07	sPlot of dE for background events
06-JUL-2005	bkg fisher splot.eps	Figure or plot	eps	11.14	sPlot of the Fisher discriminant for background events
06-JUL-2005	bkg mes splot.eps	Figure or plot	eps	12.10	sPlot of mes for background events
06-JUL-2005	conf.pdf	Paper (journal paper or conference submission by BABAR Collaboration)	pdf	186.17	Paper
17-AUG-2005	kk lr.eps	Figure or plot	eps	13.52	Points with errors are the K+K- likelihood ratio L(S)/[L(S)+L(B)] for all events in the ML fit. Red histo is the expected distribution for signal K+K-, blue histo is the expected distribution from all other components in the fit.
06-JUL-2005	kpi de splot.eps	Figure or plot	eps	10.87	sPlot of dE for signal K+pi- events
06-JUL-2005	kpi fisher splot.eps	Figure or plot	eps	11.28	sPlot of the Fisher discriminant for signal K+pi- events
17-AUG-2005	kpi lr.eps	Figure or plot	eps	12.56	Points with errors are the K+pi- likelihood ratio L(S)/[L(S)+L(B)] for all events in the ML fit. Red histo is the expected distribution for signal K+pi-, blue histo is the expected distribution from all other components in the fit.
06-JUL-2005	kpi mes splot.eps	Figure or plot	eps	11.46	sPlot of mes for signal K+pi- events
06-JUL-2005	pipi de splot.eps	Figure or plot	eps	9.98	sPlot of dE for signal pi+pi- events
06-JUL-2005	pipi fisher splot.eps	Figure or plot	eps	11.07	sPlot of the Fisher discriminant for signal pi+pi- events
17-AUG-2005	pipi lr.eps	Figure or plot	eps	12.47	Points with errors are the pi+pi- likelihood ratio L(S)/[L(S)+L(B)] for all events in the ML fit. Red histo is the expected distribution for signal pi+pi-, blue histo is the expected distribution from all other components in the fit.
06-JUL-2005	pipi mes splot.eps	Figure or plot	eps	11.37	sPlot of mes for signal pi+pi- events

Submitted To	2005 International Europhysics Conference on High Energy Physics
Date Submitted	August 19, 2005