2002/07/25 by B. Aubert, Aubert, B. · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Ionosphere and magnetosphere dynamics #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0207082
33 pages, 16 figures, submitted to ICHEP2002
arxiv created 2002/07/25 · openalex publication_date 2002/07/25 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present preliminary results from a search for the rare, flavor-changing neutral current decays B to K l+ l- and B to K* l+ l-, where l+ l- is either an e+ e- or mu+ mu- pair. The data sample comprises (84.4 +- 0.9) X 10e6 upsilon(4S) to B B-bar decays (77.8 /fb) collected with the BaBar detector at the PEP-II B factory. For B to K l+ l-, we observe a signal with estimated significance of 4.4 sigma and obtain B(B to K l+ l-) = (0.78 +0.24 -0.20 +0.11 -0.18) X 10e-6 (averaged over l = e and mu). For B to K* l+ l-, we observe an excess of events over background with estimated significance of 2.8 sigma. We obtain B(B to K* l+ l-) = (1.68 +0.68 -0.58 +-0.28) X 10e-6 and the 90% C.L. upper limit B(B to K* l+ l-) < 3.0 X 10e-6.