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Protoninduced Pion-, Eta- and Kaon-Production at Threshold | | F. Kleefeld
; M. Dillig
; | | Date: |
2 Nov 1998 | | Journal: | Proc. 8th Int. Conf. on the Structure of Baryons (Baryons ’98), 22-26.9.1998, Bonn, Germany, p. 613-616 (Eds. D.W. Menze, B. Metsch, ISBN 981-02-3865-7, (c) 1999 by World Scientific Publishing Co. Pte. Ltd.) | | Subject: | nucl-th | | Abstract: | We present some details of our recent theoretical investigations on the total cross section of the reactions $pp o pp pi^0$, $pp o pp eta$ and $pp o pLambda K^+$ at threshold. Applying standard nonrelativistic perturbation theory within the framework of meson exchange models (MEC) to all of the investigated processes we observe that theory is still far--off from a quantitative understanding of the existing data, although the qualitative behaviour of the threshold cross sections can be reproduced. The often quoted $eta^2$--dependence of the $pp o pp pi^0$ cross section at threshold is due to a calculational mistake of Koltun and Reitan (1966) and not based on theoretical grounds, where threebody phasespace behaviour would yield $eta^4$, which can be affected by final state and short range effects. To respect the high momentum transfers for $pp o pp eta$ and $pp o pLambda K^+$ relativistic models were developed. Hereby the $eta$--production still is based on MEC, while the $K^+$ production was investigated in the quark-gluon-picture based on the Bethe--Salpeter formalism. | | Source: | arXiv, nucl-th/9811003 | | Services: | Forum | Review | PDF | Favorites | |
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