Search for the rare decays $B \to K \ell^+ \ell^-$ and $B \to K^* \ell^+ \ell^-$

Aubert, Bernard; Boutigny, D.; Gaillard, J.M.; Hicheur, A.; Karyotakis, Y.; Lees, J.P.; Robbe, P.; Tisserand, V.; Palano, A.; Pompili, A.

doi:10.1103/PhysRevLett.88.241801

Search for the rare decays $B \to K \ell^+ \ell^-$ and $B \to K^* \ell^+ \ell^-$

BaBar

Collaboration

Jan, 2002

7 pages

Published in:

Phys.Rev.Lett. 88 (2002) 241801

e-Print:

hep-ex/0201008 [hep-ex]

DOI:

10.1103/PhysRevLett.88.241801

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit K}^{+}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}

Report number:

SLAC-PUB-9102,
BABAR-PUB-01-19

Experiments:

SLAC-PEP2-BABAR

View in:

reference search42 citations

Citations per year

Abstract: (arXiv)

We present results from a search for 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

22.7\times 10^6

\Upsilon(4S)\to B\bar B

decays collected with the BABAR detector at the PEP-II

B

Factory. We obtain the 90% C.L. upper limits

{\mathcal B}(B\to K\ell^+\ell^-)< 0.50\times 10^{-6}

and

{\mathcal B}(B\to K^*\ell^+\ell^-)<2.9\times 10^{-6}

, close to Standard Model predictions for these branching fractions. We have also obtained limits on the lepton-family-violating decays

B\to Ke^{\pm}\mu^{\mp}

and

B\to K^{*}e^{\pm}\mu^{\mp}

.

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: rare decay
B: semileptonic decay
neutral current: flavor changing
flavor: violation
B: branching ratio
upper limit

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Figures(0)

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Search for the rare decays B→Kℓ+ℓ−B \to K \ell^+ \ell^-B→Kℓ+ℓ− and B→K∗ℓ+ℓ−B \to K^* \ell^+ \ell^-B→K∗ℓ+ℓ−

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Search for the rare decays $B \to K \ell^+ \ell^-$ and $B \to K^* \ell^+ \ell^-$