Search for the Rare Decay B ! (cid:1)L L

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摘要

We have performed a search for the ﬂavor-changing neutral-current decays B ! (cid:1)‘ (cid:1) ‘ (cid:2) , where ‘ (cid:1) ‘ (cid:2) is either e (cid:1) e (cid:2) or (cid:2) (cid:1) (cid:2) (cid:2) , using a sample of 230 (cid:3) 10 6 (cid:1) (cid:4) 4 S (cid:5) ! B (cid:2) B decays collected with the BABAR detector. We observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be B (cid:4) B ! (cid:1)‘ (cid:1) ‘ (cid:2) (cid:5) < 9 : 1 (cid:3) 10 (cid:2) 8 at 90% conﬁdence level. We also search for the

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