Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Physik mit schweren Ionen III

HK 21.7: Vortrag

Dienstag, 23. März 1999, 15:30–15:45, D

d^′ production in heavy ion collisions — •M.I. Krivoruchenko¹, S.M. Kiselev², B.V. Martemyanov², Amand Faessler¹, and C. Fuchs¹ — ¹Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen — ²Institute for Theoretical and Experimental Physics, B.Cheremushkinskaya 25, 117259 Moscow, Russia

The production of d^′ dibaryons in heavy ion collisions due to the elementary process NN→ d^′ π is considered. The NN→ d^′ π cross section is estimated using the vacuum d^′ width Γ _d^′ ≈ 0.5 MeV extracted from data on the double charge exchange reactions on nuclei. The d^′ production rate per single collision of heavy ions is estimated at an incident beam energy of 1 A·GeV within the framework of the Quantum Molecular Dynamics transport model. We suggest to analyse the invariant mass spectrum of the NNπ system in order to search for an abundance of events with the invariant mass of the d^′ dibaryon. The d^′ peak is found to exceed the statistical fluctuations of the background at a 6σ level for 2 10⁵ · A central collisions of heavy ions with the atomic number A.