Low mass dielectrons radiated off cold nuclear matter measured with HADES

0435739 - ÚJF 2015 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Lorenz, M. - Agakishiev, G. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Sobolev, Yuri, G. - Svoboda, Ondřej - Tlustý, Pavel - Wagner, Vladimír … celkem 98 autorů
Low mass dielectrons radiated off cold nuclear matter measured with HADES.
EPJ Web of Conferences. Les Ulis: E D P Sciences, 2014, 09011. ISBN 978-2-7598-1176-2. ISSN 2100-014X.
[International Nuclear Physics Conference (INPC 2013). Firenze (IT), 02.06.2013-07.06.2013]
Grant CEP: GA ČR GA13-06759S
Institucionální podpora: RVO:61389005
Klíčová slova: HADES * spectrometers
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače

The High Acceptance DiElectron Spectrometer HADES [1] is installed at the Helmholtzzentrum fur Schwerionenforschung (GSI) accelerator facility in Darmstadt. It investigates dielectron emission and strangeness production in the 1-3 AGeV regime. A recent experiment series focusses on medium-modifications of light vector mesons in cold nuclear matter. In two runs, p + p and p + Nb reactions were investigated at 3.5 GeV beam energy; about 9 . 10(9) events have been registered. In contrast to other experiments the high acceptance of the HADES allows for a detailed analysis of electron pairs with low momenta relative to nuclear matter, where modifications of the spectral functions of vector mesons are predicted to be most prominent. Comparing these low momentum electron pairs to the reference measurement in the elementary p + p reaction, we find in fact a strong modification of the spectral distribution in the whole vector meson region.
Trvalý link: http://hdl.handle.net/11104/0239640