[en] Searches for decays of heavy neutrinos produced in meson decay and in light neutrino interactions were conducted at CERN by the CHARM Collaboration in the wide-band neutrino beam produced by 400 GeV primary protons and in a prompt neutrino beam produced by dumping 400 GeV protons in a Cu target. No evidence for these decays was found. The experiments were sensitive to neutrinos with mass in the range 0.01-2.8 GeV. The limits on the square of the neutrino mixing angle obtained are ≅ 10^-3-10^-7 depending on the neutrino mass. 19 refs

[en] By the QCD sum rule method we determine the masses and residues of the strange charmed pseudoscalar and vector mesons F and F*. Our results agree well with experiment. We obtain an estimate for the quantity m/sub s/

[en] The present status of the experiment NA11/NA32 is discussed. For 1982 final numbers for the D lifetimes are presented. A partial analysis of the 1984 data has yielded F candidates for a lifetime measurement. 6 refs.

[en] A new dynamical scheme of hadronization for nonleptonic decays is proposed. As testable consequences, new predictions over the F⁺ lifetime, over the branching ratio BR(F⁺→lυx) and over the decay F⁺→Π⁺Π^o (implying violation of the ΔI=1 rule) are given. (Author)

[en] We consider weak decays of the charmed mesons D and F. We develop a new scheme for calculating the amplitudes of two-particle nonleptonic decays based on QCD sum rules. We discuss the basic aspects of the scheme, which gives practically model-independent predictions for the partial widths of the decays

[en] Schwinger-type mass formulas are used to analyze glueball-meson mixing for isoscalar tensor mesons. In one solution, the f_J(2220) is the physical glueball, and in the other the glueball is distributed over various states, with f₂(1810) having the largest glueball component. Neither the f₂(1565) nor the f_J(1710) are among the physical states without assuming significant coupling to decay channels. The decay f₂(1525)→ππ is consistent with experiment, and f_J(2220) is neither narrow nor decays flavor democratically. (c) 2000 The American Physical Society

[en] Recent experiments to measure charmed particle lifetimes are reviewed. The preliminary results of these experiments agree on a D^+- lifetime of 7.6/sub -1.5//sup +3.6/ x 10^-13sec. The D⁰ lifetime remains uncertain: the world average is 2.7/sub -0.4//sup +0.8/ x 10^-13sec, but excluding at least two apparently good D⁰ with long flight times and excluding also some early emulsion experiments with apparent bias against long D⁰ flight times. Preliminary average lifetimes are 2.3/sub -0.7//sup +1.1/ x 10^-13sec for Λ/sub c/⁺ and 1.8/sub -0.6//sup +1.2/ x 10^-13sec for F^+-. Some developments under way to further improve vertex detectors are discussed

[en] Weak decays of charmed mesons are considered. A new quantitative framework for theoretical analysis of nonleptonic two-body decays based on the QCD sum rules are proposed. This is the first of a series of papers devoted to the subject. Theoretical foundations of the approach ensuring model-independent predictions for the partial decay widths are discussed

[en] The SLAC Hybrid Facility Photon Collaboration has now completed the analysis for BC 72/73. I will report on the results of this experiment which include measurements of the D⁰ and D⁺ lifetimes, a null search for unambiguous F decays, a measurement of the charm photoproduction cross section at 20 GeV, and evidence for mixed meson pair production and associated meson-baryon production

[en] The amplitudes of the charmed meson decays D→0^-+0^-+γ and F→0^-+0^-+γ are calculated in the framework of the SU(4)xSU(4)-chiral Lagrangians with account for anomalies. It is shown that in this approach no E1-transition exists