| Autor: |
Agakichiev, G., Agodi, C., Alvarez-Pol, H., Bałanda, A., Bertini, D., Bielcik, J., Bellia, G., Böhmer, M., Bokemeyer, H., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Chernenko, S., Christ, T., Coniglione, R., Cosentino, L., Díaz, J., Dohrmann, F., Durán, I., Eberl, T., Enghardt, W., Fabbietti, L., Fateev, O., Fernandez, C., Finocchiaro, P., Friese, J., Fröhlich, I., Fuentes, B., Garabatos, C., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Hennino, T., Hlavac, S., Holzmann, R., Homolka, J., Ierusalimov, A., Iori, I., Ivashkin, A., Jaskuła, M., Jurkovic, M., Kagarlis, M., Kajetanowicz, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kastenmüller, A., Kidoń, L., Kienle, P., Koenig, I., Koenig, W., Körner, H. J., Kolb, B. W., Kotte, R., Krücken, R., Kugler, A., Kühn, W., Kulessa, Reinhard, Kurepin, A., Lang, S., Lange, S., Lehnert, J., Lins, E., Magestro, D., Maiolino, C., Malarz, Adam, Markert, J., Metag, V., Mousa, J., Münch, M., Müntz, C., Naumann, L., Nekhaev, A., Novotny, J., Otwinowski, J., Pachmayer, Y. C., Pechenov, V., Pérez, T., Piattelli, P., Pietraszko, J., Pleskac, R., Płoskoń, M., Pospísil, V., Prokopowicz, W., Przygoda, Witold, Ramstein, B., Reshetin, A., Ritman, J., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, Piotr, Sánchez, M., Sapienza, P., Schmah, A., Schön, H., Schön, W., Schröder, C., Schwab, E., Simon, R. S., Smolyankin, V., Smykov, L., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudoł, M., Suk, M., Taranenko, A., Tlusty, P., Toia, A., Traxler, M., Tsertos, H., Vassiliev, D., Vázquez, A., Wagner, V., Waluś, Władysław, Wiśniowski, M., Wójcik, T., Wüstenfeld, J., Zanevsky, Y., Zeitelhack, K., Zovinec, D., Zumbruch, P. |
| Přispěvatelé: |
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), HADES |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
Physical Review Letters
Physical Review Letters, American Physical Society, 2007, 98, pp.052302. ⟨10.1103/PhysRevLett.98.052302⟩ |
| ISSN: |
0031-9007
1079-7114 |
| DOI: |
10.1103/PhysRevLett.98.052302⟩ |
| Popis: |
The invariant-mass spectrum of e+e- pairs produced in 12C+12C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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