Measurement of the form factors in the decay D sup + r arrow K sup 0 e sup +. nu. sub e

• Published in: Physical review letters Vol. 65:21
• Main Authors: Anjos, J.C., Appel, J.A., Bean, A., Bracker, S.B., Browder, T.E., Cremaldi, L.M., Duboscq, J.E., Elliott, J.R., Escobar, C.O., Gibney, M.C., Hartner, G.F., Karchin, P.E., Kumar, B.R., Losty, M.J., Luste, G.J., Mantsch, P.M., Martin, J.F., McHugh, S., Menary, S.R., Morrison, R.J., Nash, T., Ong, P., Pinfold, J., Punkar, G., Purohit, M.V., Santoro, A.F.S., Schmidt, D.M., Sidhu, J.S., Sliwa, K., Sokoloff, M.D., Souza, M.H.G., Spalding, W.J., Streetman, M.E., Stundzia, A.B., Witherell, M.S.
• Format: Journal Article
• Language: English
• Published: United States 19-11-1990
• Subjects: 645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties; 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; ANGULAR DISTRIBUTION; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; CHARM PARTICLES; CHARMED MESONS; D MESONS; D PLUS MESONS; DATA; DECAY; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; EXPERIMENTAL DATA; FERMIONS; FIELD THEORIES; HADRONS; INFORMATION; INTERACTIONS; K 0-1350 MESONS; KOBAYASHI-MASKAWA MATRIX; LEPTONS; MASSLESS PARTICLES; MATRICES; MATRIX ELEMENTS; MESONS; MONTE CARLO METHOD; NEUTRINOS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE PRODUCTION; PHOTOPRODUCTION; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; POSITRONS; PSEUDOSCALAR MESONS; SCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES; UNIFIED-FIELD THEORIES; WEAK HADRONIC DECAY; WEAK PARTICLE DECAY
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.65.2630

We have measured the three form factors governing the decay {ital D}{sup +}{r arrow}{ital {bar K}} {sup *0}{ital e}{sup +}{nu}{sub {ital e}}, observed in Fermilab photoproduction experiment E691, using the complete decay distribution of the data. The results are {ital A}{sub 1}(0)=0.46{plus minus}0.05{plus minus}0.05, {ital A}{sub 2}(0)=0.0{plus minus}0.2{plus minus}0.1, and {ital V}(0)=0.9{plus minus}0.3{plus minus}0.1 for the two axial-vector and the vector form factors, respectively. The {ital {bar K}} {sup *0} mesons have a ratio of longitudinal to transverse polarization of 1.8{sub {minus}0.4}{sup +0.6}{plus minus}0.3. These results are significantly different from values predicted by a number of different models.