{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T11:37:58Z","timestamp":1775043478865,"version":"3.50.1"},"reference-count":15,"publisher":"World Scientific Pub Co Pte Ltd","issue":"03n04","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mod. Phys. A"],"published-print":{"date-parts":[[2011,2,10]]},"abstract":"<jats:p> With the HADES spectrometer at GSI we have studied dilepton production in various collision systems from elementary N + N , over p + A , up to the medium-heavy Ar + KCl system. We have confirmed the puzzling results of the former DLS collaboration at the Bevalac. While we have traced the origin of the excess pair yield in C + C collisions to elementary p + p and n + p processes, we find a significant contribution from the dense phase of the collision in larger Ar + KCl system. From recently obtained e <jats:sup>+<\/jats:sup> e <jats:sup>-<\/jats:sup> pair spectra in p + p and p + Nb interactions at 3.5 GeV kinetic beam energy the inclusive production cross sections for neutral pions, \u03b7 , \u03c9 and \u03c1 mesons are extracted for the first time at this beam energy. Furthermore, the production mechanisms of the vector mesons, which are not known at these energies, are investigated. The direct comparison of p + p and p + Nb data allows us to investigate in-medium mass modifications of vector mesons at nuclear ground state density. <\/jats:p><jats:p> On the other hand, exclusive production of \u03c9 and \u03b7 mesons in p + p reactions at 3.5 GeV were studied via their \u03c0<jats:sup>+<\/jats:sup>\u03c0<jats:sup>-<\/jats:sup>\u03c0<jats:sup>0<\/jats:sup> decay channel. Production cross sections and angular distributions for both states were determined. <\/jats:p>","DOI":"10.1142\/s0217751x11051706","type":"journal-article","created":{"date-parts":[[2011,2,18]],"date-time":"2011-02-18T05:29:25Z","timestamp":1298006965000},"page":"384-389","source":"Crossref","is-referenced-by-count":2,"title":["DILEPTON PRODUCTION STUDIED WITH THE HADES SPECTROMETER"],"prefix":"10.1142","volume":"26","author":[{"name":"HADES Collaboration","sequence":"first","affiliation":[]},{"given":"A.","family":"RUSTAMOV","sequence":"additional","affiliation":[{"name":"GSI Helmholtzzentrum f\u00fcr Schwerionenforschung GmbH, 64291 Darmstadt, Germany"}]},{"given":"G.","family":"AGAKISHIEV","sequence":"additional","affiliation":[{"name":"Joint Institute of Nuclear Research, 141980 Dubna, Russia"}]},{"given":"A.","family":"BALANDA","sequence":"additional","affiliation":[{"name":"Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Krak\u00f3w, Poland"}]},{"given":"D.","family":"BELVER","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica de Part\u00edculas, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain"}]},{"given":"A.","family":"BELYAEV","sequence":"additional","affiliation":[{"name":"Joint Institute of Nuclear Research, 141980 Dubna, Russia"}]},{"given":"A.","family":"BLANCO","sequence":"additional","affiliation":[{"name":"LIP-Laborat\u00f3rio de Instrumenta\u00e7\u00e3o e F\u00edsica Experimental de Part\u00edculas, 3004-516 Coimbra, Portugal"}]},{"given":"M.","family":"B\u00d6HMER","sequence":"additional","affiliation":[{"name":"Physik Department E12, Technische Universit\u00e4t M\u00fcnchen, 85748 M\u00fcnchen, Germany"}]},{"given":"J. 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