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26 April 2024

» arxiv » nucl-ex/0609011

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Single-Pion Production in pp Collisions at =.95 GeV/c (I)
S Abd El-Samad ; R. Bilger ; K.-Th. Brinkmann ; H. Clement ; M. Dietrich ; E. Doroshkevich ; S. Dshemuchadse ; 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 ; H. Koch ; J. Kress ; E. Kuhlmann ; S. Marcello ; S. Marwinski ; R. Meier ; K. Moeller ; H.P. Morsch ; L. Naumann ; E. Roderburg ; P. Schoenmeier ; M. Schulte-Wissermann ; W. Schroeder ; M. Steinke ; F. Stinzing ; G.Y. Sun ; J. Waechter ; G.J. Wagner ; M. Wagner ; U. Weidlich ; A. Wilms ; S. Wirth ; G. Zhang ; P. Zupranski ; PostScript ; PDF ; Other formats ; SLAC-SPIRES HEP ; to ; by ;
Date:	10 Sep 2006
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 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 $pppi^0$ 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 $pi^0$ angular distributions in the kinematical region of small relative proton momenta revealing there a dominance of proton spinflip transitions associated with $pi^0$ $s$- and $d$-partial waves and emphasizing the important role of $pi^0$ d-waves.
Source:	arXiv, nucl-ex/0609011
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