排序方式: 共有4条查询结果,搜索用时 46 毫秒
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Appel R Atoyan GS Bassalleck B Bergman DR Brown DN Cheung N Dhawan S Do H Egger J Eilerts S Felder C Fischer H Gach M Herold W Issakov VV Kaspar H Kraus DE Lazarus DM Leipuner L Lichard P Lowe J Lozano J Ma H Majid W Menzel W Pislak S 《Physical review letters》2000,85(12):2450-2453
We report results of a search for the lepton-family number violating decay K+-->pi(+)&mgr;(+)e(-) from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9x10(-11) ( 90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8x10(-11). We also report a new upper limit on the branching ratio for pi(0)-->&mgr;(+)e(-) of 3.8x10(-10) ( 90% C. L.). 相似文献
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Appel R Atoyan GS Bassalleck B Bergman DR Cheung N Dhawan S Do H Egger J Eilerts S Fischer H Herold W Issakov VV Kaspar H Kraus DE Lazarus DM Lichard P Lowe J Lozano J Ma H Majid W Menzel W Pislak S Poblaguev AA Rehak P Sher A Thompson JA Truöl P Zeller ME 《Physical review letters》2000,85(14):2877-2880
A search for lepton flavor violating decays, K+ --> mu+ mu+ pi-, K+ --> e+ e+ pi-, K+ --> pi+ e+ mu-, K+ --> mu+ e+ pi-, and pi0 --> e+ mu-, was performed using the data collected in Experiment E865 at the Brookhaven Alternating Gradient Synchrotron. No signal was found in any of the decay modes. At the 90% confidence level, the branching ratios are less than 3.0x10(-9), 6.4x10(-10), 5. 2x10(-10), 5.0x10(-10), and 3.4x10(-9), respectively. 相似文献
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Poblaguev AA Appel R Atoyan GS Bassalleck B Bergman DR Cheung N Dhawan S Do H Egger J Eilerts S Herold W Issakov VV Kaspar H Kraus DE Lazarus DM Lichard P Lowe J Lozano J Ma H Majid W Pislak S Rehak P Sher A Thompson JA Truöl P Zeller ME 《Physical review letters》2002,89(6):061803
Experiment 865 at the Brookhaven Alternating Gradient Synchrotron obtained 410 K+-->e(+)nue(+)e(-) and 2679 K+-->mu(+)nue(+)e(-) events including 10% and 19% background. The branching ratios were measured to be [2.48+/-0.14(stat)+/-0.14(syst)]x10(-8) (m(ee)>150 MeV) and (7.06+/-0.16+/-0.26)x10(-8) (m(ee)>145 MeV), respectively. Results for the decay form factors are presented. 相似文献
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Ma H Appel R Atoyan GS Bassalleck B Bergman DR Cheung N Dhawan S Do H Egger J Eilerts S Fischer H Herold W Issakov VV Kaspar H Kraus DE Lazarus DM Lichard P Lowe J Lozano J Majid W Menzel W Pislak S Poblaguev AA Rehak P Sher A Thompson JA 《Physical review letters》2000,84(12):2580-2583
More than 400 K+-->pi(+)&mgr;(+)&mgr;(-) events were observed in a rare K+ decay experiment at the Brookhaven Alternating Gradient Synchrotron. Normalized to the K+-->pi(+)pi(+)pi(-) decay, the branching ratio is determined to be [9.22+/-0.60(stat)+/-0. 49(syst)]x10(-8). This branching ratio and the &mgr;&mgr; mass spectrum is in very good agreement with the measurement of the K+-->pi(+)e(+)e(-) decay, but deviates significantly from the previous measurement. 相似文献
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