Speaker
Dr
Elena Kokoulina
(On behalf of the SVD-2 Collaboration: JINR-IHEP-SINP MSU)
Description
Summary results of the SERP-E-184 experiment at the U-70 accelerator (IHEP, Protvino) are presented. Interactions of 70 GeV proton beam with carbon, silicon and lead targets were studied to detect decays of charmed $D^0$, $\overline D^0$, $D^+$, $D^-$ mesons and $\Lambda _c^+$ baryon nearby their production threshold. The possible modification of the charm properties (the width and/or the mass) nearby phase boundary is expected. Measurements of lifetimes and masses show a good agreement with PDG data. The inclusive cross sections of a charm creation and their A-dependencies are obtained.
The yields of these particles are compared to the theoretical predictions and to data of other experiments. The measured total open charm production cross section ($\sigma _{tot} (c\overline c$) = 7.1 ± 2.3(stat) ± 1.4(syst) μb/nucleon) at the collision c.m. energy $\sqrt s$ = 11.8 GeV is well above QCD model predictions. It is shown the contributions of different kinds of charmed particles to the total cross section for open charm production in proton-nucleus interactions vary with energy.
Author
Dr
Elena Kokoulina
(On behalf of the SVD-2 Collaboration: JINR-IHEP-SINP MSU)
