A total energy trigger at large angles used in a calorimetric study of 150 GeV and 300 GeV pion and proton interactions on hydrogen |
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| Authors: | C. de Marzo M. De Palma A. Distante C. Favuzzi P. Lavopa G. Maggi F. Posa A. Ranieri G. Selvaggi P. Spinelli F. Waldner A. Eskreys K. Eskreys D. Kisielewska B. Madeyski P. Malecki K. Olkiewicz B. Pawlik T. Spuijbroek |
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| Affiliation: | Dipartimento di Fisica dell''Università di Bari and Istituto Nazionale de Fisica Nucleare, Bari, Italy;Institute of Nuclear Physics, Institute of Physics and Nuclear Techniques of Academy of Mining and Metallurgy, Krakow, Poland;University of Liverpool, Liverpool, UK |
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| Abstract: | Hard hadronic scattering was studied by selecting 150 GeV and 300 GeV π?p and pp events with large energy in a 240 cell calorimeter covering 452 to 1352 in the c.m.s. polar angle and the full 2π azimuth. A downstream calorimeter measured the remaining energy flow at smaller angles. For large energy deposited in the segmented calorimeter the proton induced cross section drops below the pion induced cross section, as expected in a constituent scattering picture. However, neither a simple energy scaling of the cross section nor a dominant jet structure of the events is observed. No evidence was found for recently proposed higher-twist mechanisms leading to events |
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| Keywords: | Pluto Collaboration |
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