Charm production nearby threshold in pA-interactions at 70 GeV

Abstract

The results of the SERP-E-184 experiment at the U-70 accelerator (IHEP, Protvino) are presented. Interactions of the 70 GeV proton beam with C, Si and Pb targets were studied to detect decays of charmed $D^0$, ${\overline{D}}^0$, $D^{+}$, $D^{-}$ mesons and ${\Lambda }_c^{+}$ baryon near their production threshold. Measurements of lifetimes and masses are shown a good agreement with PDG data. The inclusive cross sections of charm production and their A-dependencies were obtained. The yields of these particles are compared with the theoretical predictions and the data of other experiments. The measured cross section of the total open charm production (${\sigma }_{\mathrm{tot}}(c\overline{c})$ = 7.1 $\pm$ 2.3(stat) $\pm$1.4(syst) $\mu$b/nucleon) at the collision c.m. energy $\sqrt{s}$ = 11.8 GeV is well above the QCD model predictions. The contributions of different species of charmed particles to the total cross section of the open charm production in proton-nucleus interactions vary with energy.

4 pages, 6 pages, 38th International Conference on High Energy Physics 3-10 August 2016, Chicago, USA

References in corpus (1)

• Charmonium and open charm production in nuclear collisions at SPS/FAIR energies and the possible influence of a hot hadronic medium