BABAR Publications

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CONF-06/039 Measurement of CP Asymmetries and Branching Fractions in B -> pi pi and B -> K pi decays

Doc Type

Conference Submissions

Record Created

July 11, 2006

SLAC-PUB

SLAC-PUB-12032 No citations

Preprint #

hep-ex/0607106

Abstract

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We present preliminary measurements of the CP asymmetries and
branching fractions for B -> pi pi and B -> K pi decays.  A total 
of 347 million BBbar events collected by the BABAR detector at
the PEP-II asymmetric-energy e+e- collider at SLAC are used for 
these results. We find

   Spipi = -0.53 +- 0.14 +- 0.02, 
   Cpipi = -0.16 +- 0.11 +- 0.03, 
   AKpi = -0.108 +- 0.024 +- 0.008,
   BF(B0 -> pi0 pi0) = (1.48 +- 0.26 +- 0.12) x 10^-6 ,
   BF(B+ -> pi+pi0) = (5.12 +- 0.47 +- 0.29) x 10^-6,
   BF(B+ -> K+pi0) = (13.3 +- 0.56 +- 0.64) x 10^-6,
   Cpi0pi0 = -0.33 +- 0.36 +- 0.08,
   Apipi0 = -0.019 +- 0.088 +- 0.014, 
   AKpi0 = 0.016 +- 0.041 +- 0.012.   

The measured values of Spipi and Cpipi imply that CP conservation in 
B0 -> pi+ pi- decays is excluded at the 3.6 sigma level.  From these 
results we present bounds on the CKM angle alpha.

Revisions and Files

1 revised July 11, 2006

File Date Thumbnails	File Name	File Type	File Format	File Size (Kb)	Comments
30-JUL-2006	abstract.txt	Abstract	txt	0.83	Text-only abstract
29-JUL-2006	babar-conf-06039.pdf	Paper (journal paper or conference submission by BABAR Collaboration)	pdf	392.42	PDF version of the ICHEP'06 pipi/Kpi paper, with updated references
29-JUL-2006	babar-conf-06039.ps.gz	Paper (journal paper or conference submission by BABAR Collaboration)	ps.gz	227.47	Compressed PostScript
30-JUL-2006	description.txt	Description	txt	1.10	description in arXiv format
31-JUL-2006	fig01a.eps	Figure or plot	eps	16.34	mES in B0 -> pi0 pi0
31-JUL-2006	fig01b.eps	Figure or plot	eps	13.31	DeltaE in B0 -> pi0 pi0
31-JUL-2006	fig01c.eps	Figure or plot	eps	12.36	Fisher in B0 -> pi0 pi0
31-JUL-2006	fig01d.eps	Figure or plot	eps	14.58	PDF ratio for B0 -> pi0 pi0
31-JUL-2006	fig02a.eps	Figure or plot	eps	22.40	mES in B+ -> pi+ pi0
31-JUL-2006	fig02b.eps	Figure or plot	eps	22.98	mES in B+ -> K+ pi0
31-JUL-2006	fig02c.eps	Figure or plot	eps	18.68	DeltaE in B+ -> pi+ pi0
31-JUL-2006	fig02d.eps	Figure or plot	eps	18.82	DeltaE in B+ -> K+ pi0
31-JUL-2006	fig02e.eps	Figure or plot	eps	17.77	Fisher in B+ -> pi+ pi0
31-JUL-2006	fig02f.eps	Figure or plot	eps	17.44	Fisher in B+ -> K+ pi0
31-JUL-2006	fig03a.eps	Figure or plot	eps	15.51	mES in B0 -> pi+pi-
31-JUL-2006	fig03b.eps	Figure or plot	eps	16.35	mES in B0 -> K+pi-
31-JUL-2006	fig03c.eps	Figure or plot	eps	12.59	DeltaE in B+ -> pi+pi0
31-JUL-2006	fig03d.eps	Figure or plot	eps	12.82	DeltaE in B0 -> K+pi-
31-JUL-2006	fig03e.eps	Figure or plot	eps	11.59	Fisher in B0 -> pi+pi-
31-JUL-2006	fig03f.eps	Figure or plot	eps	12.07	Fisher in B0 -> K+pi-
31-JUL-2006	fig04a.eps	Figure or plot	eps	16.51	mES in B0 -> h+h'- background
31-JUL-2006	fig04b.eps	Figure or plot	eps	15.55	DeltaE in B0 -> h+h'- background
31-JUL-2006	fig04c.eps	Figure or plot	eps	12.07	Fisher in h+h'- background
31-JUL-2006	fig05.eps	Figure or plot	eps	13.16	DeltaE sPlots for K+pi- and K-pi+ signal
31-JUL-2006	fig06a.eps	Figure or plot	eps	14.85	Delta t for pi+pi- signal
31-JUL-2006	fig06b.eps	Figure or plot	eps	14.50	Delta t for B0 -> K+ pi- signal
31-JUL-2006	fig06c.eps	Figure or plot	eps	22.29	Delta t in h+h'- background
31-JUL-2006	fig07.eps	Figure or plot	eps	25.03	Delta t in pi+pi- signal for B0 and B0bar tags, and the asymmetry
31-JUL-2006	fig08.eps	Figure or plot	eps	18.90	(S,C) confidence-level contour plot for B0 -> pi+pi-

Submitted To	2006 International Conference on High Energy Physics (ICHEP'06)
Date Submitted	July 29, 2006