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PUB-06/015 Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B -> K l+ l- and B -> K* l+ l-
Doc Type Journal Papers
Record Created February 19, 2006
SLAC-PUB
SLAC-PUB-11799  No citations
Preprint # hep-ex/0604007
Abstract
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We present measurements of the flavor-changing neutral current
decays $B\to K\ell^+\ell^-$ and  $B\to K^*\ell^+\ell^-$,
where $\ell^+\ell^-$ is either an $e^+e^-$ or $\mu^+\mu^-$ pair.
The data sample comprises $229\times 10^6$ 
$Y(4S) \rightarrow B\overline{B}$ 
decays collected with the BaBar detector at the PEP-II $e^+e^-$ storage ring.  
Flavor-changing neutral current decays are highly suppressed in the Standard 
Model and their predicted properties could be significantly modified
by new physics at the electroweak scale.
We measure the branching fractions 
${\cal B}(B \rightarrow K\ell\ell) = (0.34\pm 0.07 \pm 0.02)
\times 10^{-6}$,
${\cal B}(B \rightarrow K^{*}\ell\ell) = (0.78^{+0.19}_{-0.17}\pm 0.11) \times 10^{-6}$,
the direct $CP$ asymmetries of these decays, and the relative abundances
of decays to electrons and muons. For two regions in $\ell^+\ell^-$ 
mass, above and below $m_{J/\psi}$, we measure partial branching fractions
and the forward-backward angular asymmetry of the lepton pair.  In these
same regions we also measure the $K^*$ 
longitudinal polarization in $B \rightarrow K^*\ell^+\ell^-$ decays.  
Upper limits are obtained for the 
lepton flavor-violating decays 
$B\rightarrow Ke\mu$ and $B\rightarrow K^{*}e\mu$.
All measurements are consistent with Standard Model expectations.

Revisions and Files 1 revised February 19, 2006
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04-APR-2006 abstract.tex Abstract txt 1.29
20-APR-2006 babar-pub-06015.pdf Paper (journal paper or conference submission by BABAR Collaboration) ps.gz 588.67
20-APR-2006 babar-pub-06015.ps.gz Paper (journal paper or conference submission by BABAR Collaboration) ps.gz 412.17
04-APR-2006 fig01.ps Figure or plot ps 9.61
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Submitted ToPhysical Review D
Date SubmittedApril 4, 2006
Journal Year2006
Journal Volume73
Journal Article/Page Range092001
Categories
  • AWG: Radiative Penguins