$η^{\prime}$ production in proton-proton scattering close to threshold}

Details $η^{\prime}$ production in proton-proton scattering close to threshold} $η^{\prime}$ production in proton-proton scattering close to threshold}

1998-03-04

arxiv.org/abs/nucl-ex/9803002v2

Phys.Rev.Lett.80:3202-3205,1998

Physics

Nuclear Physics

Nuclear Experiment

11 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.80.3202

The $pp \to pp \eta^{\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \mbox{$ Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $ ~4.1 MeV$} have been evaluated to be \mbox{$ \sigma = 2.5 \pm 0.5~nb$, $~~~ 2.9 \pm 1.1~nb$, $~~~ 12.7 \pm 3.2~nb$, ~ and $~~~ 25.2 \pm 3.6 ~nb $}, respectively. In this region of excess energy the $\eta^{\prime}$ (958) cross sections are much lower compared to those of the $\pi ^0$ and $\eta$ production.

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