Isospin dependence of the eta-prime meson production in nucleon-nucleon collisions.

Klaja, Joanna

Dissertation / PhD Thesis/Book

Isospin dependence of the eta-prime meson production in nucleon-nucleon collisions.

Klaja, J. (Corresponding author)FZJ*

2009
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 4313, 91 p. (2009) = Jagiellonian University, Krakow

Please use a persistent id in citations: http://hdl.handle.net/2128/13904

Report No.: Juel-4313

Abstract: The upper limit of the total cross section for quasi-free pn $\rightarrow pn\eta'$ reaction has been determined in the excess energy range near the kinematical threshold. The measurement has been carried out at the COSY–11 detection setup using a proton beam and a deuteron cluster target. The identification of the $\eta$' meson has been performed using the missing mass technique. The energy dependence of the upper limit of the cross section is extracted with a fixed proton beam momentum of p$_{beam}$ =3.35 GeV/c and exploiting the Fermi momenta of nucleons inside the deuteron. The data cover a range of centre-of-mass excess energies from 0 to 24 MeV. The experimentally determined upper limit of the ratio R$_{\eta'}$ = $\frac{\sigma(pn\rightarrow pn\eta')}{\sigma(pp\rightarrow pp\eta')}$, which is smaller than the ratio for the $\eta$ meson, excludes the excitation of the S$_{11}$(1535) resonance as a dominant production mechanism of the $\eta$' meson in nucleon-nucleon collisions. At the same time, the determined upper limits of R$_{\eta'}$ go in the direction of what one would expect in the glue production and production via mesonic currents. For quantitative tests of these mechanisms an order of magnitude larger statistics and a larger energy range would be required. This can be reached with the WASA-at-COSY facility.

Note: Record converted from VDB: 12.11.2012
Note: Jagiellonian University, Krakow

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