Aubert, B;
Barate, R;
Boutigny, D;
Gaillard, JM;
Hicheur, A;
Karyotakis, Y;
Lees, JP;
... BABAR Collaboration; + view all
(2003)
Evidence for the rare decay B -> K(*)l(+)l(-) and measurement of the B -> Kl(+)l(-) branching fraction.
PHYS REV LETT
, 91
(22)
, Article 221802. 10.1103/PhysRevLett.91.221802.
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Abstract
We present evidence for the flavor-changing neutral current decay B-->K-*.(+).(-) and a measurement of the branching fraction for the related process B-->K.(+).(-), where .(+).(-) is either an e(+)e(-) or a mu(+)mu(-) pair. These decays are highly suppressed in the standard model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises 123x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the SLAC PEP-II e(+)e(-) storage ring. Averaging over K-(*) isospin and lepton flavor, we obtain the branching fractions B(B-->Kl(+)l(-))=(0.65(-0.13)(+0.14)+/-0.04)x10(-6) and B(B-->K(*)l(+)l(-))=(0.88(-0.29)(+0.33)+/-0.10)x10(-6), where the uncertainties are statistical and systematic, respectively. The significance of the B-->Kl(+)l(-) signal is over 8sigma, while for B-->K(*)l(+)l(-) it is 3.3sigma.
| Type: | Article |
|---|---|
| Title: | Evidence for the rare decay B -> K(*)l(+)l(-) and measurement of the B -> Kl(+)l(-) branching fraction |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.91.221802 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.91.221802 |
| Language: | English |
| Additional information: | © 2003 The American Physical Society |
| Keywords: | SUM-RULE ANALYSIS, LIGHT-CONE QCD, STANDARD MODEL, B->KL(+)L(-), B->K-ASTERISK-L(+)L(-) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1303639 |
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