H. Wenninger

EXPERIMENTAL-STUDY OF JETS IN ELECTRON-POSITRON ANNIHILATION

Abstract Data on hadron production by e + e − -annihilation at c.m. energies between 30 GeV and 36 GeV are presented and compared with two models both based on first-order QCD but using different schemes for the fragmentation of quarks and gluons into hadrons. In one model the fragmentation proceeds along the parton momenta, in the other along the colour-anticolour axes. The data are reproduced better by fragmentation along the colour axes.

BARYON PRODUCTION IN E+E(-)-ANNIHILATION AT PETRA

Abstract Data on p and Λ production by e + e − -annihilation at CM energies between 30 and 36 GeV are presented. Indication for an angular anticorrelation in events with baryon-antibaryon pairs is seen.

Observation of a charge asymmetry in e+e− → μ+μ−

The angular distribution and the s dependence of the total cross section for the process e+e− → μ+μ− have been measured using the JADE detector at PETRA. After radiative corrections, a forward-backward asymmetry of −(11.8±3.8) % was observed at an average centre of mass energy of 33.5 GeV. For comparison, an asymmetry of −7.8 % is expected on the basis of the standard Glashow-Salam-Weinberg model.

Inclusive V0 production in pp interactions at 12 GeV/c

Results are presented on the inclusive reactions pp → K0X, pp → ΛX and pp → ΛX at an incident antiproton momentum of 12 GeV/c in BEBC. The cross sections are studied as functions of the Feynman scaling variable x, the rapidity, the transverse momentum of the V0 and the missing mass squared. The dependence of the Λ and Λ polarization on x are also studied. Comparisons with proton-proton data at 12 GeV/c are also made. Finally, events with two detected V0 are analyzed in order to study correlations arising from the production of two strange neutral particles.

UPPER LIMIT ON BEAUTY LIFETIME AND LOWER LIMIT ON WEAK MIXING ANGLES

Abstract Muons from a multihadron sample are used to determine an upper limit τ −12 s (95% CL) on the lifetime of beauty particles. The data are obtained with the JADE detector at PETRA. The result is interpreted within the standard model.

Spin-Offs from Cern and the Case of Tuoviwdm

The process of technology transfer is described in the creation of a company spun off in 1998 from an engineering data management system developed at CERN in Switzerland, the site of the worlds largest particle accelerator. The first section discusses the chronology and development of TuoviWDM, a Web-based interface to product data management systems and data vaults residing in proprietary information systems. Software development work began in 1995. In 1996, the Tuovi system was in use in several CERN projects. In 1998, the system was in production use in all major European high-energy physics laboratories to manage documents in distributed engineering and design projects. Toward the end of 1998, a commercial version of the Tuovi system was developed and a spinoff company started in Helsinki, Finland. Section two discusses organizational and management issues and the environment of the developmental team at CERN; section three discusses features of software development and use. Sections four and five discuss industrial collaboration, which may seem to lead to problems when technology and product ideas from a scientific establishment are exploited. Two avenues for transfer of technology funded by big science projects into industry are contrasted. Section six presents lessons learned about the CERN environment. The conclusion discusses lessons learned and presents observations. Instead of trying to obtain funding for research organizations from technology, the goal should be to fertilize the industries of participating countries by establishing contacts with companies and finding mechanisms to create and support growth of spinoff companies. (TNM)

A search for charged scalar particles pair produced in e+e− annihilation☆

Abstract We have searched for unstable charged scalar particles (S ± ) such as technipions or charged Higgs particles pair produced in high energy e + e − annihilation. No evidence for such particles was observed in both decay modes e + e − →S + S − →( τν ) (hadrons) and → ( τν )( τν ). Upper limits of 4 to 11% are obtained for the branching ratio S ∓ mass range between 4 to 12 GeV.

Observation of Four - Jet Structure in

Abstract Topological distributions of hadrons from the reaction e + e − → hadrons are studied at center of mass energies of about 33 GeV. The experimental distributions in the parameters acoplanarity and tripodity, both sensitive to events with a four-jet structure, show significant deviations from the expectations for two- and three-jet events. They can be described well by the inclusion of four-jet events. The relative magnitude of the observed effect indicates second order QCD as its probable origin.

e^+ e^-

The reactions pp→K*(890)X, pp→Σ±(1385)X and pp→S*(993)X at 12 GeV/c incident momentum have been studied using 19 000 events with a visible V0 decay in BEBC. Inclusive production cross sections of these resonances as a function of transverse momentum and rapidity are presented. The contribution of annihilation to the production of the K*(890) is investigated from a comparison with the corresponding pp data.

Annihilation at

Abstract We report the evidence for a narrow charged peak (5.5 s.d.), which we suggest calling the I, in the 6-prong-V 0 topology of p p interactions at 12 GeV/ c . The mass, widht and the product of cross section σ I times the branching ratio BR into the final state (K s o τ±τ + τ − are found to be: M I =2.60 ± 0.01 GeV / c 2 , Γ I ⩽ 0.018 GeV / c 2 , σ I ·BR≈20 μbarn