P. Zhou
Helmholtz-Zentrum Dresden-Rossendorf
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Publication
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Physics Letters B | 2010
G. Agakichiev; A. Balanda; D. Belver; A.V. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; K. Göbel; M. Golubeva; D. González-Díaz
Abstract We report measurements of electron pair production in elementary p + p and d + p reactions at 1.25 GeV / u with the HADES spectrometer. For the first time, the electron pairs were reconstructed for n + p reactions by detecting the proton spectator from the deuteron breakup. We find that the yield of electron pairs with invariant mass M e + e − > 0.15 GeV / c 2 is about an order of magnitude larger in n + p reactions as compared to p + p . A comparison to model calculations demonstrates that the production mechanism is not sufficiently described yet. The electron pair spectra measured in C + C reactions are compatible with a superposition of elementary n + p and p + p collisions, leaving little room for additional electron pair sources in such light collision systems.
Physical Review C | 2010
G. Agakishiev; A. Balanda; R. Bassini; D. Belver; A. Blanco; J.L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; F. Dohrmann; A. Dybczak; T. Eberl; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; T. Galatyuk; R. Gernh; A. Gil; C. Gilardi; M. Golubeva; D. Gonz; F. Guber; T. Hennino; R. Holzmann; I. Iori
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