Evidence for K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}}
The first observation of the decay K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}} has been reported. The E787 experiment presented evidence for the K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}} decay, based on the observation of a single clean event from data collected during the 1995 run of the AGS (Alternating Gradient Synchrotron at Brookhaven National Laboratory). The branching ratio indicated by this observation, B(K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}}) = 4.2{sub {minus}3.5}{sup +9.7} x 10{sup {minus}10}, is consistent with the Standard Model expectation although the central experimental value is four times larger. The final E787 data sample, from the 1995--98 runs, should reach a sensitivity of about five times that of the 1995 run alone. A new experiment, E949, has been given scientific approval and should start data collection in 2001. It is expected to achieve a sensitivity of more than an order of magnitude below the prediction of the Standard Model.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 11721
- Report Number(s):
- BNL-66324; KA0401; R&D Project: PO22; KA0401; TRN: US0102086
- Resource Relation:
- Conference: PROCEEDINGS OF THE INTERNATIONAL WORKSHOP ON CP VIOLATION IN K., HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION (KEK), TANASHI BRANCH, TANASHI, TOKYO (JP), 12/18/1998--12/19/1998; Other Information: PBD: 18 Dec 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evidence for K{sup +} {r_arrow} {pi}{sup +} {nu}{anti {nu}}
Evidence for {Kappa}{sup +} {r_arrow} {pi}{sup +}{nu}{anti {nu}}