Observation of D sub s sup + r arrow K sup 0 K sup + and D sub s sup + r arrow K sup 0 K sup + and an upper limit on D sub s sup + r arrow K sup 0. pi. sup

• Published in: Physical review letters 1989-09, Vol.63:12
• Main Authors: Adler, J., Bai, Z., Becker, J.J., Blaylock, G.T., Bolton, T., Brient, J., Brown, J.S., Bunnell, K.O., Burchell, M., Burnett, T.H., Mark III Collaboration
• Format: Article
• Language: English
• Subjects: 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; BOSONS; BRANCHING RATIO; CABIBBO ANGLE; CHARM PARTICLES; CHARMED MESONS; D MESONS; D PLUS MESONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; EXPERIMENTAL DATA; FIELD THEORIES; GEV RANGE; GEV RANGE 01-10; HADRONS; INFORMATION; KAONS; KAONS NEUTRAL; KAONS PLUS; MASS; MESONS; MONTE CARLO METHOD; NUMERICAL DATA; PARTICLE DECAY; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PIONS; PIONS PLUS; PSEUDOSCALAR MESONS; QUANTUM CHROMODYNAMICS; QUANTUM FIELD THEORY; SPEAR; STORAGE RINGS; STRANGE MESONS; STRANGE PARTICLES; TIME-OF-FLIGHT METHOD; WEAK HADRONIC DECAY; WEAK PARTICLE DECAY
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.63.1211

We report the first observation of the decay {ital D}{sub {ital s}}{sup +}{r arrow}{bar K}{sup 0}{ital K}{sup +} and a new measurement of the decay {ital D}{sub {ital s}}{sup +}{r arrow}{ital {bar K}} *(892){sup 0}{ital K}{sup +}. The data were collected at {radical}{ital s}=4.14 GeV with the Mark III detector at the SLAC {ital e}{sup +}{ital e}{sup {minus}} storage ring at SPEAR. We obtain the relative branching fractions {ital B}({ital D}{sup +}{sub {ital s}}{r arrow}{ital {bar K}}{sup 0}{ital K}{sup +}/ {ital B}{ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +})=0.92{plus minus}0.32{plus minus}0.20 and {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{ital {bar K}}{sup *0}{ital K}{sup +})/ {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +})=0.84{plus minus}0.30{plus minus}0.22, using our new determination of {sigma}{ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}). A search for the Cabibbo-suppressed decay {ital D}{ital s}{sup +}{r arrow}{ital K}{sup 0}{pi}{sup +} yields a limit {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{ital K}{sup 0}{pi}{sup +})/{ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}){lt}0.21 at the 90% confidence level.