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Measurement of charged pions in C-12+C-12 collisions at 1 A GeV and 2 A GeV with HADES

AuthorsAgakishiev, G.; HADES Collaboration; Díaz Medina, José ; Gil Ortiz, Alejandro; Ramstein, B.
Issue Date23-Jan-2009
CitationEur.Phys.J.A 40,45-59(2009)
AbstractWe present the results of a study of charged-pion production in C-12 + C-12 collisions at incident beam energies of 1 A GeV and 2 A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of pi(+/-) mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield. We have performed the first large-angular-range measurement of the distribution of pi(+/-) mesons for the C-12 + C-12 collision system covering a fairly large rapidity interval. The pion yields, transverse-mass and angular distributions are compared with calculations done within a transport model, as well as with existing data from other experiments. The anisotropy of pion production is systematically analyzed.
Publisher version (URL)http://dx.doi.org/10.1140/epja/i2008-10746-7
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