Observation of $B \to K^* \ell^+ \ell^-$
| dc.creator | Ishikawa, A. | |
| dc.date | 2003-08-17 | |
| dc.date | 2003-09-16 | |
| dc.date.accessioned | 2026-07-07T12:02:04Z | |
| dc.date.available | 2026-07-07T12:02:04Z | |
| dc.description | We report the first observation of the flavor-changing neutral current decay $B \to K^* \ell^+ \ell^-$ and an improved measurement of the decay $B \to K \ell^+ \ell^-$, where $\ell$ represents an electron or a muon, with a data sample of 140 fb${}^{-1}$ accumulated at the $Υ(4S)$ resonance with the Belle detector at KEKB. The results for the branching fractions are ${\cal B}(B \to K^* \ell^+ \ell^-)=(11.5^{+2.6}_{-2.4} \pm 0.8 \pm 0.2) \times 10^{-7}$ and ${\cal B}(B \to K \ell^+ \ell^-)=(4.8^{+1.0}_{-0.9} \pm 0.3 \pm 0.1) \times 10^{-7}$, where the first error is statistical, the second is systematic and the third is from model dependence. | |
| dc.description | 11 pages, 2 figures, submitted to PRL | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0308044 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0308044 | |
| dc.identifier | Phys.Rev.Lett.91:261601,2003 | |
| dc.identifier | doi:10.1103/PhysRevLett.91.261601 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/207312 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Observation of $B \to K^* \ell^+ \ell^-$ | |
| dc.type | text |