Acta Physica Polonica B
Vol. 37, No. 1, January 2006, page 139
HADES Experiment: Di-Lepton Spectroscopy in p+p (2.2 GeV) and C+C
(1 and 2 A GeV) Collisions
W. Przygoda, G. Agakishiev, C. Agodi, H. Alvarez-Pol, A.
Balanda, R. Bassini, G. Bellia, D. Belver, J. Bielcik, A. Blanco, M.
Boehmer, C. Boiano, A. Bortolotti, J. Boyard, S. Brambilla, P.
Braun-Munzinger, P. Cabanelas, S. Chernenko, T. Christ, R. Coniglione,
M. Dahlinger, J. Diaz, R. Djeridi, F. Dohrmann, I. Duran,
T. Eberl, W. Enghardt, L. Fabbietti, O. Fateev, P. Finocchiaro, P.
Fonte, J. Friese, I. Froehlich, J. Garzon, R. Gernhaeuser, M. Golubeva,
D. Gonzalez-Diaz,
E. Grosse, F. Guber, T. Heinz, T. Hennino, S. Hlavac, J. Hoffmann, R.
Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jaskula, M.
Jurkovic, M. Kajetanowicz, B. Kaempfer, K. Kanaki, T. Karavicheva, D.
Kirschner, I. Koenig, W. Koenig, B. Kolb, U. Kopf, R. Kotte, J.
Kotulic-Bunta, R. Kruecken, A. Kugler, W.~Kuehn, R. Kulessa, S. Lang,
J. Lehnert, L. Maier, P. Maier-Komor, C. Maiolino, J. Marin, J.
Markert, V. Metag, N. Montes, E. Moriniere, J. Mousa, M.~Muench,
C. Muentz, L. Naumann, R. Novotny, J. Novotny, W. Ott, J. Otwinowski,
Y. Pachmayer, T. Perez, V. Pechenov, J. Pietraszko, J. Pinhao, R.
Pleskac, V. Pospisil, A. Pullia, N. Rabin, B. Ramstein, S. Riboldi, J.
Ritman, P. Rosier, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer,
P. Salabura, P. Sapienza, A. Schmah, W. Schoen, C. Schroeder, E.
Schwab, P. Senger, R. Simon, V. Smolyankin, L. Smykov, S. Spataro, B.
Spruck, H. Stroebele, J. Stroth, C.~Sturm, M. Sudol, V. Tiflov, P.
Tlusty, A. Toia, M. Traxler, H. Tsertos, I. Turzo, V.
Wagner, W. Walus, C. Willmott, S. Winkler, M. Wisniowski, T. Wojcik,
J.~Wuestenfeld, Y. Zanevsky, P. Zumbruch
The HADES (High Acceptance Di-Electron Spectrometer) is a tool
designed for lepton pair (e+e-) spectroscopy in
pion, proton and heavy ion induced reactions in the 1--2 A GeV energy
range. One of the goals of the HADES experiment is to study in-medium
modifications of hadron properties like effective masses, decay widths,
electromagnetic form factors etc. Such effects can be probed with
vector mesons (\rho , \omega , \phi ) decaying into e+e-
channel. The identification of vector mesons by means of a HADES
spectrometer is based on invariant mass reconstruction of e+e-
pairs. The combined information from all spectrometer sub-detectors is
used to reconstruct the di-lepton signal. The recent results from 2.2
GeV p+p, 1 A GeV and 2 A GeV C+C experiments are presented.
PACS numbers: 25.75.Dw, 13.60.Le