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Collective characteristics of hadron systems produced in beam fragmentation of π+ p collisions at 250 GeV/c |
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| Authors: | I V Ajinenko H Białkowska H Böttcher F Botterweck F Crijns A De Roeck E A De Wolf K Dziunikovska A M F Endler P F Ermolov Z C Garutchava Y A Golubkov N G Grigoryan G R Gulkanyan P van Hal T Haupt J K Karamyan Z A Kirakosyan D Kisielewska W Kittel S S Megrabyan F Meijers A B Michałowska K Olkiewicz L P Petrovikh A M Rybin H Saarikko L Scholten E K Shabalina F Verbeure R Wischnewski S A Zotkin |
| 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, O-1615, Berlin-Zeuthen, Federal Republic of Germany 4. University of Nijmegen and NIKHEF-H, NL-6525 ED, Nijmegen, The Netherlands 5. Universitaire Instelling Antwerpen, B-2610, Wilrijk 6. VUB/ULB, Inter-University Institute for High Energies, B-1050, Brussels, 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, 22290, Rio de Janeiro, Brazil 11. Moscow State University, SU-117234, Moscow, USSR 12. Institute of High Energy Physics of Tbilisi State University, SU-380086, Tbilisi, USSR 13. Institute of Physics, SU-375036, Yerevan, USSR 17. Department of High Energy Physics, Helsinki University, SF-00170, Helsinki, Finland |
| Abstract: | Collective characteristics are studied of hadrons produced in beam fragmentation of non-single-diffractive π+ p-interactions at 250 GeV/c. An attempt is made to obtain experimental information on the properties of leading cluster production and fragmentation. On average, the leading cluster carries 0.8±0.1 of the incident momentum, so that the mean value of the inelasticity coefficient of 〈k〉=0.2±0.1 is significantly smaller than that deduced from leading single hadron spectra. The momentum transfer distribution shows that nonsingle-diffractive processes are less peripheral than diffraction dissociation. The analysis of thrust and sphericity shows jet-like structure of pion fragmentation, that of the charge flow an average forward charge of 〈Q f 〉=0.45±0.04, in agreement with the average charge of the beam valence quarks. Our data are compared to diffraction dissociation and to the Fritiof model. |
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