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Negative binomials and multiplicity distributions in 250 GeV/cK + and π+ interactions on Al and Au nuclei |
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| Authors: | I V Ajinenko Yu A Belokopytov H Bialkowska H Boettcher F Botterweck M Charlet P V Chliapnikov F Crijns A De Roeck D A De Wolf K Dziunikowska A M F Endler A Eskreys Z C Garutchava Y A Golubkov G R Gulkanyan P van Hal R Sh Hakobyan T Haupt W Kittel D Kisielewska B B Levchenko B Machowski F Meijers A B Micha?owska V I Nikolaenko K Olkiewicz R P?ll?nen V M Ronjin A M Rybin H M T Saarikko L Scholten L N Smirnova O G Tchikilev V A Uvarov F Verbeure R Wischnewski EHS-NA Collaboration |
| Institution: | 1. Institute for High Energy Physics, SU-142284, Serpukhov, USSR 2. University of Warsaw and Institute of Nuclear Problems, PL-00681, Warsaw, Poland 3. Institut für Hochenergiephysik der Akademie der Wissenschaften der DDR, DDR-1615, Berlin-Zeuthen, German Democratic Republic 4. University of Nijmegen and NIKHEF-H, NL-6525 ED, Nijmegen, The Netherlands 5. Inter-University Institute for High Energies, B-1050, Brussels, Belgium 6. Department of Physics, Universitaire Instelling Antwerpen, B-2610, Wilrijk, Belgium 9. Institute of Physics and Nuclear Techniques of the Academy of Mining and Metallurgy and Institute of Nuclear Physics, PL-30055, Krakow, Poland 10. Centro Brasileiro de Pesquisas Fisicas, BR-22290, Rio de Janeiro, Brazil 11. Institute of High Energy Physics, Tbilisi State University, SU-380086, Tbilisi, USSR 12. Moscow State University, SU-119899, Moscow, USSR 13. Institute of Physics, SU-375036, Yerevan, USSR 17. Department of High Energy Physics, University of Helsinki, SF-00170, Helsinki, Finland |
| Abstract: | The negative binomial distribution (NBD) is fitted to all charged and to negative particle multiplicity distributions in restricted rapidity intervals, both in the forward and backward c.m. hemispheres of positive meson interactions on Al and Au nuclei. For negative particle multiplicity distributions, the NBD parameters are also determined as a function ofn g, the number of grey tracks, corresponding to varying number of intranuclear collisions. The data are interpreted in terms of the clan picture of Giovannini and Van Hove and compared to the MCMHA and Fritiof models. Both models reproduce quite well the global multiplicity distributions, but not when sub-samples are considered with fixed number of grey tracks. Regularities are better visible on the parton than on the particle level. |
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