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

P. Moskal; J. T. Balewski; A. Budzanowski; H. Dombrowski; C. Goodman; D. Grzonka; J. Haidenbauer; C. Hanhart; L. Jarczyk; M. Jochmann; A. Khoukaz; K. Kilian; M. Köhler; A. Kozela; T. Lister; U. -G. Meißner; N. Nikolaev; W. Oelert; C. Quentmeier; R. Santo; G. Schepers; U. Seddik; T. Sefzick; J. Smyrski; M. Sokołowski; A. Strzałkowski; C. Thomas; M. Wolke; P. Wüstner; D. Wyrwa

doi:10.1103/physrevlett.80.3202

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

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Abstract

The $pp \to pp η^{\prime}$ (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$} have been evaluated to be \mbox{$ σ= 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 $η^{\prime}$ (958) cross sections are much lower compared to those of the $π^0$ and $η$ production.

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P. Moskal, J. T. Balewski, A. Budzanowski, H. Dombrowski, C. Goodman, D. Grzonka, J. Haidenbauer, C. Hanhart, L. Jarczyk, M. Jochmann, A. Khoukaz, K. Kilian, M. Köhler, A. Kozela, T. Lister, U. -G. Meißner, N. Nikolaev, W. Oelert, C. Quentmeier, R. Santo, G. Schepers, U. Seddik, T. Sefzick, J. Smyrski, M. Sokołowski, A. Strzałkowski, C. Thomas, M. Wolke, P. Wüstner, D. Wyrwa. 1998-03-06. $η^{\prime}$ production in proton-proton scattering close to threshold}. https://doi.org/10.1103/physrevlett.80.3202

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