BABAR Publications

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PUB-03/042 Study of B^{+-} -> J/psi pi^{+-} and B^{+-} -> J/psi K^{+-} Decays: Measurement of the Ratio of Branching Fractions and Search for Direct CP Violation

Doc Type

Journal Papers

Record Created

November 1, 2003

SLAC-PUB

SLAC-PUB-10318 No citations

Preprint #

hep-ex/0401035

Abstract

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We study B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays 
in a sample of about 89 million BB~ pairs collected with the 
BABAR detector at the PEP-II asymmetric B-factory at SLAC.
We observe a signal of 244 +/- 20 B^+/- --> J/psi pi^+/- events 
and determine the ratio BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> 
J/psi K^+/-) to be 
[5.37 +/- 0.45 (stat.) +/- 0.11 (syst)]%.
The charge asymmetries for the B^+/- --> J/psi pi^+/- 
and B^+/- --> J/psi K^+/- decays are determined to be
A_pi = 0.123 +/- 0.085 (stat.) +/- 0.004 (syst.)
and A_K = 0.030 +/- 0.015 (stat.) +/- 0.006 (syst.),
respectively.

Revisions and Files

1 revised November 1, 2003

File Date Thumbnails	File Name	File Type	File Format	File Size (Kb)
23-JAN-2004	abstract.txt	Abstract	txt	0.59
23-JAN-2004	babar-pub-03042.pdf	Paper (journal paper or conference submission by BABAR Collaboration)	pdf	156.64
23-JAN-2004	babar-pub-03042.ps	Paper (journal paper or conference submission by BABAR Collaboration)	ps	383.50
23-JAN-2004	fig01.eps	Figure or plot	eps	17.12
23-JAN-2004	fig02.eps	Figure or plot	eps	14.40
23-JAN-2004	fig03.eps	Figure or plot	eps	14.63

Submitted To	Physical Review Letters
Date Submitted	January 23, 2004
Journal Year	2004
Journal Volume	92
Journal Article/Page Range	241802