Abstract
The reaction $\mathrm{pp}\ensuremath{\Rightarrow}p{\ensuremath{\pi}}^{+}X$ was studied in order to look for dibaryons at invariant masses ${M}_{\mathrm{pX}}.$ The experiment was performed at three different energies ${(T}_{p}=1520$, 1805, and 2100 MeV) and at several different angles from $0\ifmmode^\circ\else\textdegree\fi{}$ up to $17\ifmmode^\circ\else\textdegree\fi{}$ (lab). Narrow dibaryons were observed in invariant mass spectra at 2050, 2122, and 2150 MeV. The corresponding numbers of standard deviations vary between 3.2 and 12.6. The mass of these narrow dibaryons agree with systematic studies of dibaryonic masses experimentally observed through many experiments performed by various collaborations. Such a systematic study allows us to define the mean dibaryonic mass spectrum, and is found to be in agreement with the spectrum calculated within a simple phenomenological mass formula based on color magnetic interactions between two colored quark clusters.
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