Study of the decays D sup 0 r arrow K K ,. pi. pi

• Published in: Physical review letters 1990-09, Vol.65:10
• Main Authors: Alexander, J., Artuso, M., Bebek, C., Berkelman, K., Browder, T., Cassel, D.G., Cheu, E., Coffman, D.M., Crawford, G., DeWire, J.W., Drell, P.S., Ehrlich, R., Gittelman, B., Gray, S.W., Halling, A.M., Hartill, D.L., Heltsley, B.K., Honscheid, K., Kandaswamy, J., Katayama, N., Kreinick, D.L., Lewis, J.D., Ludwig, G.S., Mistry, N.B., Nandi, S., Nordberg, E., O'Grady, C., Peterson, D., Pisharody, M., Riley, D., Sapper, M., Selen, M., Silverman, A., Stone, S., Worden, H., Worris, M., Sadoff, A.J., Avery, P., Besson, D., Garren, L., Yelton, J., Kinoshita, K., Pipkin, F.M., Procario, M., Wilson, R., Wolinski, J., Xiao, D., Zhu, Y., Ammar, R., Baringer, P., Coppage, D., Haas, P., Kelly, M., Kwak, N., Lam, H., Ro, S., Jawahery, A., Kubota, Y., Nelson, J.K., Perticone, D., Poling, R., Fulton, R., Jensen, T., Johnson, D.R., Kagan, H., Kass, R., Morrow, F., Whitmore, J., Wilson, P., Bortoletto, D., Chen, W., Dominick, J., McIlwain, R.L., Miller, D.H., Ng, C.R., Schaffner, S.F., Shibata, E.I., Shi
• Format: Article
• Language: English
• Subjects: 645103 - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties; BOSONS; BRANCHING RATIO; CHARM PARTICLES; CHARMED MESONS; D MESONS; D NEUTRAL MESONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; EXPERIMENTAL DATA; GEV RANGE; GEV RANGE 01-10; HADRONIC PARTICLE DECAY; HADRONS; INFORMATION; KAONS; LIMITING VALUES; MASS; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE IDENTIFICATION; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PIONS; PSEUDOSCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.65.1184

Using the CLEO detector we have observed the Cabibbo-suppressed decays {ital D}{sup 0}{r arrow}{ital K}{sup 0}{ital {bar K}0}, {ital K}{sup +}{ital K}{sup {minus}}, and {pi}{sup +}{pi}{sup {minus}}. We determine {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup 0}{ital {bar K}0})= (0.13{sup +0.07}{sub {minus}0.05}{sup +0.02}{sub {minus}0.02})%. Our measurement {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup +}{ital K}{sup {minus}})/{ital B}({ital D}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}})=2.35{plus minus}0.37{plus minus}0.28 represents asubstantial improvement over previous results. We find no evidence for the decay {ital D}{sup 0}{r arrow}{pi}{sup 0}{pi}{sup 0}, and place a 90%-confidence-level upper limit of {ital B}({ital D}{sup 0}{r arrow}{pi}{sup 0}{pi}{sup 0}){lt}0.46%.