| DATE: |
2008-09-16 16:00 - 17:00 |
| PLACE: |
Room 345, Building 4 |
| TITLE: |
Final Results from BNL E949 on the Rare Decay $K^{+} \to \pi^{+} \nu \bar{\nu}$ |
| CONTACT: |
Takuya Hasegawa |
| SPEAKER: |
Takeshi K. Komatsubara (KEK-IPNS) |
| LANGUAGE: |
English |
| ABSTRACT: |
An extremely rare decay, the K+ meson turning into a pi+ meson, a neutrino, and anti-neutrino, has been studied with the high-intensity proton beam available at the AGS of Brookhaven National Laboratory (BNL) in the US. The E949 experiment measured the branching ratio in the pion momentum region 211 < P < 229 MeV/c above the K+ -> pi+pi0 peak. [Phys.Rev.Lett.93, 031801 (2004)]; details of the analysis were pulished this year as Phys.Rev.D77, 052003 (2008).
The results of a search with E949 in 140 < P < 1991 MeV/c, below the K+ -> pi+pi0 peak, was obtained recently [arXiv:0808.2459]. The analysis, as well as the final results on the branching ratio from the E949 data combined with the data by the previous E787 experiment, is reported in this seminar. |
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