| タイトル | KEK-Report: 2001-1 |
| その他のタイトル | An experimental study of the rare decay K(+) to pi(+)nu bar-nu
K(+)のpi(+)nu antinu稀崩壊の実験的研究 |
| 著者（日） | 村松 憲仁 |
| 著者（英） | Muramatsu, Norihito |
| 著者所属（日） | 高エネルギー加速器研究機構 |
| 著者所属（英） | High Energy Accelerator Research Organization |
| 発行日 | 2001-05 |
| 発行機関など | National Laboratory for High Energy Physics |
| 刊行物名 | KEK-Report |
| 刊行年月日 | 2001-05 |
| 言語 | eng |
| 抄録 | The BNL-E787 experiment collected data equivalent to 3.2 x 10(exp 12) K(+) decays in 1995 - 1997. One candidate event of the K(+) to pi(+)nu antinu decay was observed in the signal region where the total background level was estimated to be 0.083 +/- 0.019 events. This candidate event survived even when the background rejection was tightened until the background level became 0.0065 events and 33 percent of the acceptance was retained. Based on this one candidate event, the branching ratio was measured to be 1.52 + 3.48/- 1.12 x 10(exp -10) which resulted in the range of a Cabibbo-Kobayashi-Maskawa matrix element V(sub td) to be 0.0024 less than absolute value of V(sub td) less than 0.038. |
| キーワード | K(+) to pi(+)nu antinu decay experiment; rare decay; flavor changing neutral current; branching fraction; background rejection; radiation detector; BNL-E787 experiment; K(+)のpi(+)nuantinu崩壊実験; 稀崩壊; フレーバーを変える中性カレント; 分岐比; バックグランド排除; 放射線検出器; BNL-E787実験 |
| 資料種別 | Technical Report |
| SHI-NO | AA0032987000 |
| レポートNO | KEK-Report-2001-1 |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/38735 |
