Observation of B ---> K* l+ l-
Journal
Physical Review Letters
Journal Volume
91
Pages
261601
Date Issued
2003-08
Author(s)
Ishikawa A. et al.
Abe, K.
Abe, K.
Abe, T.
Adachi, I.
Ahn, B.S.
Aihara, H.
Akai, K.
Akatsu, M.
Akemoto, M.
Asano, Y.
Abstract
We report the observation of the flavor-changing neutral current decay B-->K(*)l(+)l(-) and an im-proved measurement of the decay B-->Kl(+)l(-), where l represents an electron or a muon, with a data sample of 140 fb(-1) accumulated at the Upsilon(4S) resonance with the Belle detector at KEKB. The results for the branching fractions are B(B-->K(*)l(+)l(-))=(11.5(+2.6)(-2.4)+/-0.8+/-0.2)x10(-7) and B(B-->Kl(+)l(-))=(4.8(+1.0)(-0.9)+/-0.3+/-0.1)x10(-7), where the first error is statistical, the second is systematic and the third is from model dependence.
Type
conference paper