Počet záznamů: 1

Origin of the low-mass electron pair excess in light nucleus-nucleus collisions

  1. 1.
    0355992 - UJF-V 2011 RIV NL eng J - Článek v odborném periodiku
    Agakichiev, G. - Balanda, A. - Belver, D. - Belyaev, A. V. - Blanco, A. - Böhmer, M. - Boyard, J. L. - Braun-Munzinger, P. - Cabanelas, P. - Castro, E. - Chernenko, S. - Christ, T. - Destefanis, M. - Díaz, J. - Dohrmann, F. - Dybczak, A. - Fabbietti, L. - Fateev, O.V. - Finocchiaro, P. - Fonte, P. - Friese, J. - Frohlich, I. - Galatyuk, T. - Garzón, J.A. - Gernhäuser, R. - Gil, A. - Gilardi, C. - Gobel, K. - Golubeva, M. - Gonzalez-Diaz, D. - Hennino, G.T. - Holzmann, R. - Iori, I. - Ivashkin, A. - Jurkovic, M. - Kämpfer, B. - Karavicheva, T. - Kirschner, D. - Koenig, I. - Koenig, W. - Kolb, B.W. - Kotte, R. - Křížek, Filip - Kruecken, R. - Kuhn, W. - Kugler, Andrej - Kurepin, A. - Lang, S. - Lange, J.S. - Lapidus, K. - Liu, T. - Lopes, L. - Lorenz, M. - Maier, L. - Mangiarotti, A. - Markert, J. - Metag, V. - Michalska, B. - Michel, J. - Moriniére, E. - Mousa, J. - Muntz, C. - Naumann, L. - Otwinowski, J. - Pachmayer, Y.C. - Palka, M. - Parpottas, Y. - Pechenov, V. - Pechenova, O. - Pietraszko, J. - Przygoda, W. - Ramstein, B. - Reshetin, A. - Rustamov, A. - Sadovsky, A. - Salabura, P. - Schmah, A. - Schwab, E. - Sobolev, Yuri, G. - Spataro, S. - Spruck, B. - Strobele, H. - Stroth, J. - Sturm, C. - Sudol, M. - Tarantola, A. - Teilab, K. - Tlustý, Pavel - Traxler, M. - Trebacz, R. - Tsertos, H. - Wagner, Vladimír - Weber, M. - Wisniowski, M. - Wojcik, T. - Wüstenfeld, J. - Yurevich, S. - Zanevsky, V.V. - Zhou, P.
    Origin of the low-mass electron pair excess in light nucleus-nucleus collisions.
    Physics Letters. B. Roč. 690, č. 2 (2010), s. 118-122 ISSN 0370-2693
    Grant CEP: GA MŠk LC07050; GA MŠk LA316; GA AV ČR IAA100480803
    Výzkumný záměr: CEZ:AV0Z10480505
    Klíčová slova: Virtual bremsstrahlung * Dileptons * Nucleon-nucleon collisions
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 5.255, rok: 2010

    We report measurements of electron pair production in elementary p + p and d + p reactions at 1.25 GeV/mu 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 Me+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
    Trvalý link: http://hdl.handle.net/11104/0194629