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

Authors :: Krücken, R.
Agakichiev, G.
Bałanda, A.
Belver, D.
Belyaev, A. V.
Blanco, A.
Böhmer, M.
Boyard, J. L.
Braun-Munzinger, P.
Cabanelas, Pablo
Castro, E.
Chernenko, S.
Christ, T.
Destefanis, M.
Diáz, J.
Dohrmann, F.
Dybczak, A.
Fabbietti, L.
Fateev, O. V.
Finocchiaro, P.
Fonte, P.
Friese, J.
Fröhlich, I.
Galatyuk, T.
Garzón, J. A.
Gernhäuser, R.
Gil, A.
Gilardi, C.
Göbel, K.
Golubeva, M.
González-Díaz, D.
Guber, F.
Hennino, T.
Holzmann, R.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kämpfer, B.
Karavicheva, T.
Kirschner, D.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kotte, R.
Krizek, F.
Kühn, W.
Kugler, A.
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.
Morinière, E.
Mousa, J.
Müntz, C.
Naumann, L.
Otwinowski, J.
Pachmayer, Y. C.
Palka, M.
Parpottas, Yiannis
Pechenov, V.
Pechenova, O.
Pietraszko, J.
Przygoda, W.
Ramstein, B.
Reshetin, A.
Rustamov, A.
Sadovsky, A.
Salabura, P.
Schmah, A.
Schwab, E.
Sobolev, Yu G.
Spataro, S.
Spruck, B.
Ströbele, H.
Stroth, J.
Sturm, C.
Sudol, M.
Tarantola, A.
Teilab, K.
Tlusty, P.
Traxler, M.
Trebacz, R.
Tsertos, Haralambos
Wagner, V.
Weber, M.
Wisniowski, M.
Wojcik, T.
Wüstenfeld, J.
Yurevich, S.
Zanevsky, Y. V.
Zhou, P.
Institut de Physique Nucléaire d'Orsay (IPNO)
Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Helmholtz zentrum für Schwerionenforschung GmbH (GSI)
HADES
Tsertos, Haralambos [0000-0001-5966-343X]
Source :: Physics Letters B, Physics Letters B, Elsevier, 2010, 690, pp.118-122. ⟨10.1016/j.physletb.2010.05.010⟩, Digital.CSIC. Repositorio Institucional del CSIC, instname, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Phys Lett Sect B Nucl Elem Part High-Energy Phys
Publication Year :: 2009
Publisher :: arXiv, 2009.
Abstract: 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.<br />The collaboration gratefully acknowledges the support by BMBF grants 06TM970I, 06GI146I, 06F-140, and 06DR135 (Germany), by GSI (TM-FR1,GI/ME3,OF/STR), by Helmholtz Alliance HA216/EMMI, by grants GA CR 202/00/1668 and GA AS CR IAA1048304 (Czech Republic), by grant KBN 1P03B 056 29 (Poland), by INFN (Italy), by CNRS/IN2P3 (France), by grants MCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain), by grant UCY-10.3.11.12 (Cyprus), by INTAS grant 03-51-3208 and by EU contract RII3-CT-2004-506078.

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ISSN :: 20002041 and 03702693
Database :: OpenAIRE
Journal :: Physics Letters B, Physics Letters B, Elsevier, 2010, 690, pp.118-122. ⟨10.1016/j.physletb.2010.05.010⟩, Digital.CSIC. Repositorio Institucional del CSIC, instname, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Phys Lett Sect B Nucl Elem Part High-Energy Phys
Accession number :: edsair.doi.dedup.....7c792ad6d4451cacd9ac30b4e0607b2a
Full Text :: https://doi.org/10.48550/arxiv.0910.5875