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  • Articles: DFG German National Licenses  (5)
  • 1980-1984  (5)
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  • Articles: DFG German National Licenses  (5)
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  • 1
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction configuration in momentum and position space has been investigated in detail from exclusive final states in $$\bar pp$$ interactions at centre of mass energies 2.01 and 2.96 GeV. In momentum space one finds a tendency towards a planar configuration at low multiplicities. In position space, one sees the average impact parameter decreasing with increasing multiplicity. At large multiplicities, events become more phase-space like i.e., more central whereas at lower multiplicities the effect ofp t damping can be seen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using data obtained with EHS equipped with the Rapid Cycling Bubble Chamber (RCBC) exposed to a proton beam of 360 GeV/c, we calculate topological cross sections. We present in great detail the procedure and the techniques used to correct raw data. Finally, we give multiplicity moments and multiplicity correlations and we compare the values obtained in our experiment, together with data at other energies, with different models.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A search has been carried out for neutral charm production in 5,108 proton-emulsion interactions at 400 GeV/c. Nine charm candidates have been observed in our fiducial volume which extends from 100 μm-1,000 μm in the forward cone. One of these is a 4-prong and the others are 2-prong events with opening angle〉10 mrad and momenta of both decay tracks〉150 MeV/c. Search for associated charm decays was made in an extended fiducial volume around the primary stars of these nine candidates. This yielded two neutral 2-prong events, one associated with the 4-prong and the other with a 2-prong candidate. All unassociated candidates are consistent with being backgrounds due toK s , Λ decays, neutral interactions and γ conversions whereas the background to associated events is negligible. Based on the two associated decays the inclusive cross section forD 0, −0 production is determined as 27±20 μb/nucleon. Detailed measurements on the 4-prong candidate lead to the identification of one decay track as an electron and another as a kaon. This is interpreted as a semi-leptonic, Cabbibo favouredD 0/D −0 decay.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 21 (1983), S. 137-144 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Prompt lepton production in proton beam dump experiments has been critically analysed within the general frame work of $$A_c \bar D$$ and $$D\bar D$$ production and their subsequent semileptonic decays. Realistic decay modes based on recent experiments are used. We have investigated the effect of using differentx dependences for the charm particles obtained either from simple quark counting rules or as inferred from strange particle production data. The $$D\bar D$$ production is assumed to have a linearA dependence and for the $$A_c \bar D$$ process bothA 1 andA 2/3 dependence is used. We show that by a simultaneous fit to the energy and angular distributions of prompt leptons in all the experiments the ratio of $$A_c \bar D$$ to $$D\bar D$$ production cross section can be determined. A comparison of this fit with these experimental distributions indicates that thex dependences based on strange particle data are strongly favoured. AnA 2/3 dependence for $$A_c \bar D$$ production, which corresponds to a quasi-diffractive process, is favoured although within existing errorsA 1 dependence cannot be ruled out. Putting together the cross section results from our analysis with other results at similar energies (p 1ab ∼400GeV/c) the production cross sections ( $$A_c \bar D$$ ) and ( $$D\bar D$$ ) are estimated to be ∼25 and ∼20 μb/nucleon respectively leading to a total inclusive charm cross section of ∼90 μb/nucleon.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The inclusive production of photons in $$\bar pp$$ interactions has been studied at incident momenta of 0.76 and 2.0 GeV/c. The inclusive cross sections for γ-production and the average multiplicities of γ, «n γ», are presented as a function of the charged prong topology. Results on the two particle correlation parametersf 00 andf −0 are presented. The inclusive distributions of the Feynman variablex and of the transverse momentump T of the photons are compared with the expectations from charged pion distributions on the basis of charge independence. A search has been made for direct γ-production in $$\bar pp$$ interactions at 0.76 GeV/c by looking for events which fit uniquely the hypothesis $$\bar pp \to m\pi ^ + + m\pi ^ - + \gamma $$ . An estimate of the ratio $$R = \frac{{\sigma (\bar pp \to m\pi ^ + + m\pi ^ - + \gamma )}}{{\sigma (\bar pp \to m\pi ^ + + m\pi ^ - + \pi ^0 )}}$$ is given.
    Type of Medium: Electronic Resource
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