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  • Articles: DFG German National Licenses  (6)
  • Electronic Resource  (6)
  • 1985-1989  (6)
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  • Articles: DFG German National Licenses  (6)
Material
  • Electronic Resource  (6)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Diffraction dissociation at the CERN pulsedpp collider at c.m. Energies of 900 and 200 GeV (1986)
    Springer
    The European physical journal 33 (1986), S. 175-185 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross-sections for diffractive particle production and pseudorapidity distributions of the decay products of diffractive states are presented. The data were obtained with the UA 5 streamer chamber detector at the CERNpp Collider operated in a new pulsed mode yieldingpp interactions at c.m. energies of 900 and 200 GeV. Data recorded with a special trigger designed to select a sample of events enriched in single-diffractive interactions clearly favour ap t -limited fragmentation of diffractive states. The cross-section for single-diffractive particle production ϊ was found to be 7.8±0.5±1.1 mb at 900 GeV and 4.8±0.5±0.8 mb at 200 GeV (first error statistical, second systematic). From the pseudorapidity distribution of diffractive states we deduce the average number of charged particles to be 6.5±1.0 at 900 GeV and 4.1±1.1 at 200 GeV. Furthermore we report on our estimates for the cross-section of double-diffractive particle production at both Collider energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411134
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Charged particle multiplicity distributions at 200 and 900 GeV c.m. energy (1989)
    Springer
    The European physical journal 43 (1989), S. 357-374 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multiplicity distributions of charged particles produced in non single-diffractive collisions between protons and antiprotons at centre of mass energies of 200 and 900 GeV are presented. The data were recorded in the UA5 streamer chambers at the CERN Collider, which was operated in a pulsed mode between the two energies. A new method to correct for acceptance limitations and inefficiencies based on the principle of maximum entropy has been used. Multiplicity distributions in full phase space and in intervals of pseudorapidity are presented in tabular form. The violation of KNO scaling in full phase space found by the UA5 group at an energy of 546 GeV is confirmed also at 200 and 900 GeV. The shape of the 900 GeV distribution in full phase space is narrower in the peak region than at 200 GeV but exhibits a pronounced high multiplicity tail. The negative binomial distribution fits data at 200 GeV in all pseudorapidity intervals and in small intervals at 900 GeV. In large intervals at 900 GeV, however, the negative binomial distribution. Fits to the partially coherent laser distribution are also presented as well as comparisons with predictions of the Dual Parton, the Fritiof and the Pythia models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01506531
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photon production at c.m. energies of 200 and 900 GeV (1989)
    Springer
    The European physical journal 43 (1989), S. 75-89 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present data on photon production in non single-diffractivep $$\bar p$$ -collisions at c.m. energies of 200 and 900 GeV. Besides the general properties of photon production, i.e. pseudorapidity distribution and average multiplicity, we also investigate photon-charged two-particle pseudorapidity and multiplicity correlations. We find for the average number of photons in non single-diffractivep $$\bar p$$ -collisions 22.2±1.4±2.0 at 200 GeV and 41.4±2.1±3.5 at 900 GeV, where the first error is statistical and the second systematic. The analysis of photon-charged particle multiplicity correlations reveals strong positive correlations between the average number of photons and the number of simultaneously produced charged particles, as expected from FNAL and ISR studies and from our result at 546 GeV. We obtain for the correlation slope 0.95±0.08±0.11 at 200 GeV and 1.09±0.09±0.13 at 900 GeV (first error is statistical and the second systematic). The investigation of photon-charged two-particle pseudorapidity correlations shows that these correlations are of short range and compatible with the observed charged two-particle pseudorapidity correlations. These correlations and the results for the average number of photons as a function of the produced number of charged particles favour the conclusion that photon sources other than π0 s contribute significantly to the observed photon yield in non single-diffractivep $$\bar p$$ -collisions. For example, if all photons are assumed to come from π0 s and η mesons, a η/π0 ratio of about 20% is inferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02430612
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Antiproton-proton cross sections at 200 and 900 GeV c.m. energy (1986)
    Springer
    The European physical journal 32 (1986), S. 153-161 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data on antiproton-proton cross sections at the c.m. energies 200 and 900 GeV are presented. The data were obtained at the CERN antiproton-proton Collider operated in a new pulsed mode in which the same beams were accelerated and decelerated between beam energies of 450 and 100 GeV. The properties of the machine determine the ratio of the luminosities at the two energies to about 1% and thus an accurate measurement of the ratioR of the inelastic cross sections could be made. We findR (=σ 900/σ 200)=1.20±0.01±0.02, where the first error is statistical and the second systematic. Interpolating existing data to estimateσ ine1(200 GeV) this measurement ofR leads toσ ine1(900 GeV)=50.3+0.4+1.0 mb. Using an extrapolated value ofσ e1/σ tot we estimate the total cross section at 900 GeV to be 65.3±0.7±1.5 mb. Both the inelastic and total cross sections are compatible with a ln2 s dependence. Comparisons are made with different fits to the total cross section energy dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01552491
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Scaling of pseudorapidity distributions at c.m. energies up to 0.9 TeV (1986)
    Springer
    The European physical journal 33 (1986), S. 1-6 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New data are presented on charged particle pseudorapidity distributions for inelastic events produced at c.m. energies $$\sqrt s $$ =200 and 900 GeV. The data were obtained at the CERN antiproton-proton Collider operated in a new pulsed mode. The rise of the central density ρ(0) at energies up to $$\sqrt s $$ =900 GeV has been studied. A new form of central region scaling is found involving the densityρ n (0) for charged multiplicityn, namely that the scaled central densityρ n (0)/ρ(0) expressed as a function ofz=n/〈n〉 is independent ofs. Scaling in the fragmentation region holds to 10–20%, and the small amount of scalebreaking observed here could be accommodated within the framework suggested by Wdowcyk and Wolfendale to account for both accelerator and cosmic ray data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410446
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Masses for clans introduced to explain hadronic multiplicity distributions (1987)
    Springer
    The European physical journal 35 (1987), S. 493-498 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The facts that the negative binomial distribution very well describes high energy multiplicity distributions and that this distribution is the result of a compound Poisson-logarithmic distribution are used to search for new dynamics in particle production. It is shown that the logarithmic distribution for the particle multiplicity of clans follows if 1) the number of particles in the clans follows a Poisson distribution at fixed mass and 2) the mass distribution belongs to a certain class of distributions. Data are used to set limits on possible mass distributions. Comparisons with data are made for two examples of distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596901
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    Paper (German National Licenses)
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