Journal article
Authors list: Adamczewski-Musch, J.; Arnold, O.; Atomssa, E. T.; Behnke, C.; Belounnas, A.; Belyaev, A.; Berger-Chen, J. C.; Biernat, J.; Blanco, A.; Blume, C.; Boehmer, M.; Bordalo, P.; Chernenko, S.; Chlad, L.; Deveaux, C.; Dreyer, J.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Filip, P.; Fonte, P.; Franco, C.; Friese, J.; Froehlich, I.; Galatyuk, T.; Garzon, J. A.; Gernhaeuser, R.; Golubeva, M.; Guber, F.; Gumberidze, M.; Harabasz, S.; Heinz, T.; Hennino, T.; Hlavac, S.; Höhne, C.; Holzmann, R.; Ierusalimov, A.; Ivashkin, A.; Kaempfer, B.; Karavicheva, T.; Kardan, B.; Koenig, I.; Koenig, W.; Kolb, B. W.; Korcyl, G.; Kornakov, G.; Kotte, R.; Kuehn, W.; Kugler, A.; Kunz, T.; Kurepin, A.; Kurilkin, A.; Kurilkin, P.; Ladygin, V.; Lalik, R.; Lapidus, K.; Lebedev, A.; Liu, T.; Lopes, L.; Lorenz, M.; Mahmoud, T.; Maier, L.; Mangiarotti, A.; Markert, J.; Maurus, S.; Metag, V.; Michel, J.; Mihaylov, D. M.; Moriniere, E.; Morozov, S.; Muentz, C.; Muenzer, R.; Naumann, L.; Nowakowski, K.; Palka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Petousis, V.; Petukhov, O.; Pietraszko, J.; Przygoda, W.; Ramos, S.; Ramstein, B.; Reshetin, A.; Rodriguez-Ramos, P.; Rosier, P.; Rost, A.; Sadovsky, A.; Salabura, P.; Scheib, T.; Schuldes, H.; Schwab, E.; Scozzi, F.; Seck, F.; Sellheim, P.; Siebenson, J.; Silva, L.; Sobolev, Yu. G.; Spataroh, S.; Stroebele, H.; Stroth, J.; Strzempek, P.; Sturm, C.; Svoboda, O.; Tlusty, P.; Traxler, M.; Tsertos, H.; Usenko, E.; Wagner, V.; Wendisch, C.; Wiebusch, M. G.; Wirth, J.; Zanevsky, Y.; Zumbruch, P.; Sarantsev, A. V.
Publication year: 2017
Journal: The European Physical Journal A
Volume number: 53
Issue number: 7
ISSN: 1434-6001
eISSN: 1434-601X
Open access status: Hybrid
DOI Link: https://doi.org/10.1140/epja/i2017-12341-3
Publisher: Springer
Abstract:
We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e(+)e(-) pairs above the pi(0) mass in the exclusive channel dp -> npe(+)e(-)(p(spect)) as compared to the exclusive channel ppe(+)e(-) measured in proton-proton collisions at the same energy. That excess points to different bremsstrahlung production mechanisms. Two models were evaluated for the role of the charged pion exchange between nucleons and double-Delta excitation combined with intermediate rho-meson production. Differential cross sections as a function of the e(+)e(-) invariant mass and of the angles of the virtual photon, proton and electrons provide valuable constraints and encourage further investigations on both experimental and theoretical sides.
Citation Styles
Harvard Citation style: Adamczewski-Musch, J., Arnold, O., Atomssa, E., Behnke, C., Belounnas, A., Belyaev, A., et al. (2017) Analysis of the exclusive final state npe+e- in the quasi-free np reaction, The European Physical Journal A, 53(7), Article 149. https://doi.org/10.1140/epja/i2017-12341-3
APA Citation style: Adamczewski-Musch, J., Arnold, O., Atomssa, E., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., ...Sarantsev, A. (2017). Analysis of the exclusive final state npe+e- in the quasi-free np reaction. The European Physical Journal A. 53(7), Article 149. https://doi.org/10.1140/epja/i2017-12341-3
Keywords
BEAM ENERGIES; CROSS-SECTIONS; DILEPTON PRODUCTION; HADES; HEAVY-ION COLLISIONS; PION-PRODUCTION; PP; PROTON-PROTON COLLISIONS
