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Measurement of the B -> X(s)l(+)l(-) branching fraction with a sum over exclusive modes

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, JM; Hicheur, A; Karyotakis, Y; ... BaBar Collaboration; + view all (2004) Measurement of the B -> X(s)l(+)l(-) branching fraction with a sum over exclusive modes. PHYS REV LETT , 93 (8) , Article 081802. 10.1103/PhysRevLett.93.081802. Green open access

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Abstract

We measure the branching fraction for the flavor-changing neutral-current process B-->X(s)l(+)l(-) with a sample of 89x10(6) Y(4S)-->B (B) over bar events recorded with the BABAR detector at the PEP-II e(+)e(-) storage ring. The final state is reconstructed from e(+)e(-) or mu(+)mu(-) pairs and a hadronic system X-s consisting of one K+/- or K-S(0) and up to two pions, with at most one pi(0). We observe a signal of 40+/-10(stat)+/-2(syst) events and extract the inclusive branching fraction B(B-->X(s)l(+)l(-))=(5.6+/-1.5(stat)+/-0.6(exp syst)+/-1.1(model syst))x10(-6) for m(l)(+)l(-)>0.2 GeV/c(2).

Type: Article
Title: Measurement of the B -> X(s)l(+)l(-) branching fraction with a sum over exclusive modes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.93.081802
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.93.081802
Language: English
Additional information: The American Physical Society
Keywords: DECAYS
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/1303675
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