Inclusive particle production in the geometrical two-chain model of soft hadronic interactions.
The geometrical two-chain model was established to describe the soft, low-energy hadronic interaction. The main aim of the model was the applicability of creating a fast and accurate Monte Carlo interaction generator of such processes in complex and time-consuming simulation calculations as, e.g., that of the simulations of the hadron passage through the thick media. In this paper we present the model predictions concerning the inclusive particle production characteristics. A comparison with the fritiof model frequently used for high-energy event generation and experimental results is given.
A method for measuring strangeness suppression in light quark fragmentation at LEP
Abstract A new method is described for measuring strangeness suppression in light quark fragmentation using the reaction e + e − → Z → q q . The technique is based on q q electroweak asymmetries and uses only strange mesons of one type. Since it does not rely on a comparison of the production of states with different masses, the method could provide a test of whether the strangeness suppression in light quark fragmentation operates at the quark or at the hadron level. The method is essentially independent of Monte Carlo models and is relatively free of experimental systematic errors.
The European Hybrid Spectrometer
The final version of the European hybrid spectrometer (EHS) is described. EHS was used in the NA27 experiment to study charm particles produced in 360 GeVc π−pand400 GeVc pp interactions. A rapid cycling, high resolution bubble chamber (LEBC) produced bubbles of 17 μm diameter which were measured with a precision of 2.5 μm. Short-lived charm particles are observed with an efficiency up to 90% (D±). The spectrometer accepts 70% of all particles produced, including approximately 100% of those in the forward hemisphere and the momenta of charged particles are measured to better than 1% over the whole momentum range. The charged particle identification detectors give information on 84% of the spectrometer tracks, half of which obtain unique identification. Two lead glass detectors measure the energy of electromagnetic showers such that the π0 mass distribution has a fwhm of 20 MeVc2. Hadronic showers are measured with two iron/scintillator calorimeters. The mass resolutions are 3.0, 0.9 and 11 MeVc2 for K0, Λ0 and D− charged particles respectively. The D0 mass is measured to be (1865.1 ± 1.8 ± 0.8) MeVc2.