A PRECISION MEASUREMENT OF THE BRANCHING RATIO K+ -+~+.~~/K++p+u~ *
نویسندگان
چکیده
A measurement of the branching ratio K+-P~+~~~/K~--+~~I/,, was made using stopped kaons from pp annihilations at rest and a. magnetic spectrometer to measure the momenta of the charged decay product to the 1% to 1.5% level. The determination is based on 45,500 events passing final data cuts. The resulting ratio is .3329 f .0047 (statistical) f.OO1O (systematic). Submitted to Physical Review D. *Work supported by Department of Energy contract DE-AC03-76SF00515. ‘Present address: Fermi National Laboratory, Batavia, IL 60510. *Pre%nt address: Stanford Linear Accelerator Center, Stanford University. Stanford, CA 94309.
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