[en] We have searched for the rare flavour changing neutral current decay b → sγ in the multihadron data sample taken at the Υ(4S) resonance with the help of the Crystal Ball detector at the e⁺ e^- storage ring DORIS II. The non-observation of any monochromatic photon line in the inclusive photon spectrum resulted in the estimation of the following upper limit of the branching fraction for the process under investigation BR(b→sγ) < 4.1 x 10^-3 (at 90% confidence level), as well as for some of the related exclusive decays: BR(B→K^*(892)γ) < 1.8 x 10^-3, BR(B→K₁(1400)γ) < 1.3 x 10^-3, BR(B→K₂(1770)γ) < 0.9 x 10^-3, BR(B→K₄^*(2075)γ) < 0.9 x 10^-3. The decays B → KJ/ψ and B → K^*J/ψ have also been searched for. No enhancement was found in the spectrum of the missing mass with respect to the electron pair in the final state coming from the decay J/ψ → e⁺e^-. The following upper limits have been determined: BR(B→KJ/ψ) < 0.6 x 10^-2, BR(B→K^*(892)J/ψ) < 0.8 x 10^-2, BR(B→K₁(1400)J/ψ) < 1.5 x 10^-2, BR(B→K₃^*(1780)J/ψ) < 1.9 x 10^-2. In order to test predictions of the Standard Model versions together with higher order QCD corrections or to get evidence for new physics beyond it a substantial improvement of the constraint for the branching fraction for the decay b → sγ (up to one order of magnitude) is necessary. (orig.)

[en] Latest LEP results concerning hadrons containing b-quarks are reviewed. The average lifetime of the b-hadrons together with the lifetimes of the B_u⁺, B_d⁰, B_s and Λ_b and first mass measurements of the B_s and Λ_b are presented. (author). 34 refs, 7 figs, 4 tabs

[en] A review of recent experimental progress in the B meson spectroscopy is given. The results concerning the masses, production rates at Z⁰ energy and helicity of beauty mesons are presented and compared with theoretical predictions. (author)

[en] Short communication. 3 refs., 1 fig

No abstract available

[en] A summary of important LEP measurements in the b-quark physics is presented. The following topics are reviewed: b-fragmentation, the spectroscopy and lifetimes of beauty hadrons, B⁰-(dash)B⁰ oscillations and the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements Abs(V_cb). (author)

[en] The Glauber picture of the nucleus-nucleus collisions is tested in the most direct way, i.e. by comparison of the Glauber-type calculation of the wounded nucleon number distribution with the data on spectator charge distribution measured in several Dubna experiments. We get reasonable agreement with the propane bubble chamber and streamer chamber data. The emulsion data seem to disagree with our calculation. 14 refs., 7 figs., 10 tabs. (author)

[en] This report describes the experimental research about the heavy baryons which were obtained in the last decade at LEP. The most important among them concern the lifetimes of beauty baryons. The methods of theoretical description of heavy hadrons together with the LEP experimental apparatus are also discussed. Heavy baryon studies are shown in a broader perspective of other LEP results: the test of the standard model and the latest measurements concerning the beauty mesons. (author)

No abstract available

No abstract available