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Production and decay of the charged D∗ meson in e+e− annihilation at 10 GeV centre-of-mass energy

1985; Elsevier BV; Volume: 150; Issue: 1-3 Linguagem: Inglês

10.1016/0370-2693(85)90177-7

1873-2445

H. Albrecht, U. Binder, G. Drews, G. Harder, H. Hasemann, A. Philipp, W. Schmidt‐Parzefall, H. Schröder, H.D. Schulz, F. Selonke, R. Wurth, A. Drescher, B. Gräwe, U. Matthiesen, H. Scheck, J. Spengler, D. Wegener, R. Heller, K. R. Schubert, J. Stiewe, R. Waldi, S. Weseler, K. W. Edwards, W.R. Frisken, C. Fukunaga, M. Goddard, P.C.H. Kim, R. Kutschke, D. B. MacFarlane, J. A. McKenna, K. W. McLean, A. Nilsson, R. S. Orr, P. Padley, P. M. Patel, J.D. Prentice, H. Seywerd, B.J. Stacey, T.-S. Yoon, J. C. Yun, R. Ammar, D. Coppage, R. Davis, S. G. Kanekal, N. Kwak, P. Böckmann, L. Jönsson, Y. Oku, M. Danilov, V. Lubimov, V. Matveev, N. Nagovitsin, V. Ryltsov, Yu. A. Semënov, V. Shevchenko, V. Soloshenko, V. Sopov, I. Tichomirov, Yu. Zaitsev, R. Childers, C.W. Darden, H. Gennow,

Quantum Chromodynamics and Particle Interactions

Using the ARGUS detector at DORIS we have observed the prediction of the charged D∗ meson in e+e− annihilation at a center of mass energy of 10 GeV. The D∗ fragmentation function has been measured using the decay channels D∗+ → D0π+ and D0 → K−π+ and K−π+π+π−. We find σ·Br for the channels D0 → K−π+ and D0 → K−π+π+π− to be (23.6 ± 2.2 ± 4.7) pb and (51.0 ± 4.6 ± 15.5) pb respectively, and the ratio of branching ratios Br(D0 → K−π+π+π−)/Br(D0 → K−π+) = 2.17 ± 0.28 ± 0.23. In addition we measure the mass difference M(D∗+) − M(D0) to be (145.46 ± 0.07 ± 0.03) MeV, and set an upper limit for D0 − D̄0 mixing of 0.11.