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IHEP 97 - 47 (in Russian) | |
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| V.G.Kartasheva | ||
| Search for Process of Pion Double Color Charge Exchange on Be-Nucleus Protons | ||
| Protvino, 1997. - p. 15, figs. 8, refs.: 16. | ||
The paper describes data investigation results of the recent exposition of SIGMA-AYAKS experiment on the search dibaryons with separated color in pi- -Be interactions at momentum 43 GeV/c. The differential cross sections of proton production at momenta 0.6 - 1.5 GeV/c and deuteron production at momenta 0.9 - 1.5 GeV/c are presented in the wide angle region -0.15 < cos theta < 0.65. The contribution of the processes where the baryon accompanied pi- -meson at momentum $p_l$ > 28 GeV/ñ and |$t_l$| < 1 GeV/ñ to these cross sections are estimated. A sample of the events with a topology as for pion double colour charge exchange on Be-nucleus protons has been selected among the events of pp-pair production. The contribution of this sample to the total number of pp-pairs at the same momenta is ${R_s}$=(10.5 +- 2.6) % and a value of the sample cross section is ${\sigma_s}^{\pi pp}$=(54 +- 17) mu b. An average value of diproton effective mass spectrum of the selected events is $\approx$2.5 GeV/${ñ^2}$and the width of these mass spectrum is $\approx$0.2 GeV/${ñ^2}$.
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