A Search for the Decay $B^{-}\to K^{-} ν\barν$
| dc.creator | Aubert, B. | |
| dc.date | 2003-04-11 | |
| dc.date | 2003-04-29 | |
| dc.date.accessioned | 2026-07-07T03:35:44Z | |
| dc.date.available | 2026-07-07T03:35:44Z | |
| dc.description | We present a search for the rare flavour-changing neutral-current decay $B^{-}\to K^{-} ν\barν$ based on a sample of $(86.9 \pm 1.0) \times 10^{6}$ $Υ(4S) \to $B\bar{B}$ events collected by the BABAR experiment at the SLAC B-factory. Signal candidate events are selected by fully reconstructing a $B^+ \to \bar{D}^{0} X^+$ decay, where $X^+$ represents a combination of up to three charged pions or kaons and up to two $π^0$ candidates. The charged tracks and calorimeter clusters not used in the $B^+$ reconstruction are required to be compatible with a $B^{-}\to K^{-} ν\barν$ decay. We observe a total of three signal candidate events with an expected background of $2.7 \pm 0.8$, resulting in a preliminary limit of $\mathcal{B}(B^{-}\to K^{-} ν\barν) < 1.05 \times 10^{-4}$ at the 90% confidence level. This search is combined with the results of a previous and statistically independent preliminary BABAR search for $B^{-}\to K^{-} ν\barν$ to give a limit of $\mathcal{B}(B^{-}\to K^{-} ν\barν) < 7.0 \times 10^{-5}$ at the 90% confidence level. | |
| dc.description | Presented at XXXVIII Rencontres de Moriond on Electroweak Interactions and Unified Theories | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0304020 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0304020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/37465 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | A Search for the Decay $B^{-}\to K^{-} ν\barν$ | |
| dc.type | text |