Single-Pion Production in pp collisions at 0.95 GeV/c (I)

Abdel-Samad, S.; Morsch, H. P.; Naumann, L.; Böhm, A.; Clement, H.; Stinzing, F.; Jäkel, R.; Wächter, J.; Kilian, K.; Kuhlmann, E.; Möller, K.; Schönmeier, P.; Freiesleben, H.; Doroshkevich, E.; Hesselbarth, D.; Wilms, A.; Wagner, G. J.; Kress, J.; Marcello, S.; Fanara, C.; Michel, P.; Schulte-Wissermann, M.; Filippi, A.; Eyrich, W.; Karsch, L.; Wagner, M.; Jakob, B.; Brinkmann, K.; Marwinski, S.; Dshemuchadse, S.; Erhardt, A.; Schröder, W.; Schamlott, A.; Roderburg, E.; Steinke, M.; Hauffe, J.; Fritsch, M.; Zielinski, U.; Bilger, R.; Sun, G. Y.; Meier, R.; Koch, H.; Wirth, S.; Geyer, J.

doi:10.1140/epja/i2006-10133-6

Journal Article

Single-Pion Production in pp collisions at 0.95 GeV/c (I)

Abdel-Samad, S.FZJ* ; Bilger, R. ; Böhm, A. ; Brinkmann, K. ; Clement, H. ; Doroshkevich, E. ; Dshemuchadse, S. ; Erhardt, A. ; Eyrich, W. ; Fanara, C. ; Filippi, A. ; Freiesleben, H. ; Fritsch, M. ; Geyer, J. ; Hauffe, J. ; Hesselbarth, D.FZJ* ; Jäkel, R. ; Jakob, B. ; Karsch, L. ; Kilian, K.FZJ* ; Koch, H. ; Kress, J. ; Kuhlmann, E.FZJ* ; Marcello, S. ; Marwinski, S.FZJ* ; Meier, R. ; Michel, P. ; Möller, K. ; Morsch, H. P.FZJ* ; Naumann, L. ; Roderburg, E.FZJ* ; Schamlott, A. ; Schönmeier, P. ; Schröder, W. ; Schulte-Wissermann, M. ; Steinke, M. ; Stinzing, F. ; Sun, G. Y. ; Wächter, J. ; Wagner, G. J. ; Wagner, M. ; Wilms, A. ; Wirth, S. ; Zielinski, U.

2006
Springer Berlin

The European physical journal / A 30, 443 (2006) [10.1140/epja/i2006-10133-6]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10555 doi:10.1140/epja/i2006-10133-6

Abstract: The single-pion production reactions pp --> d pi(+), pp --> np pi(+) and pp --> pp pi(o) were measured at a beam momentum of 0.95 GeV/c (T-p approximate to 400 MeV) using the short version of the COSY-TOF spectrometer. The implementation of a central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements. Thus, all pion production channels were recorded with 1-4 overconstraints. The total and differential cross-sections obtained are compared to previous data and theoretical calculations. Main emphasis is put on the discussion of the pp pi(o) channel, where we obtain angular distributions different from previous experimental results, however, partly in good agreement with recent phenomenological and theoretical predictions. In particular, we observe very large anisotropies for the pi(o) angular distributions in the kinematical region of small relative proton momenta revealing there a dominance of proton spinflip transitions associated with pi(o) s and d partial waves and emphasizing the important role of pi(o) d-waves.

Keyword(s): p p: inelastic scattering ; pi+: hadroproduction ; pi0: hadroproduction ; mass spectrum: missing-mass ; channel cross section ; angular distribution: anisotropy ; partial wave ; spectrometer: experimental results ; Juelich COSY PS ; p p --> deuteron pi+ ; p p --> n p pi+ ; p p --> 2p pi0 ; 0.95 GeV/c