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24 April 2024

» arxiv » 0807.1189

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Single-Pion Production in pp Collisions at 0.95 GeV/c (II)
S. Abd El-Samad ; R. Bilger ; K. Th. Brinkmann ; H. Clement ; M. Dietrich ; E. Doroshkevich ; S. Dshemuchadse ; K. Ehrhardt ; A. Erhardt ; W. Eyrich ; A. Filippi ; H. Freiesleben ; M. Fritsch ; R. Geyer ; A. Gillitzer ; J. Hauffe ; D. Hesselbarth ; R. Jaekel ; B. Jakob ; L. Karsch ; K. Kilian ; J. Kress ; E. Kuhlmann ; S. Marcello ; S. Marwinski ; R. Meier ; K. Moeller ; H.P. Morsch ; L. Naumann ; J. Ritman ; E. Roderburg ; P. Schoenmeier ; M. Schulte-Wissermann ; W. Schroeder ; F. Stinzing ; G.Y. Sun ; J. Waechter ; G.J. Wagner ; M. Wagner ; U. Weidlich ; A. Wilms ; S. Wirth ; G. Zhang ; P. Zupranski ;
Date:	8 Jul 2008
Abstract:	The single-pion production reactions $pp o dpi^+$, $pp o nppi^+$ and $pp o pppi^0$ were measured at a beam momentum of 0.95 GeV/c ($T_p approx$ 400 MeV) using the short version of the COSY-TOF spectrometer. The central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements from other detector parts. Thus all pion production channels were recorded with 1-4 overconstraints. Main emphasis is put on the presentation and discussion of the $nppi^+$ channel, since the results on the other channels have already been published previously. The total and differential cross sections obtained are compared to theoretical calculations. In contrast to the $pppi^0$ channel we find in the $nppi^+$ channel a strong influence of the $Delta$ excitation already at this energy close to threshold. In particular we find a $(3 cos^2Theta + 1)$ dependence in the pion angular distribution, typical for a pure s-channel $Delta$ excitation and identical to that observed in the $dpi^+$ channel. Since the latter is understood by a s-channel resonance in the $^1D_2$ $pn$ partial wave, we discuss an analogous scenario for the $pnpi^+$ channel.
Source:	arXiv, 0807.1189
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