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Wyświetlanie 1-10 z 164
Tytuł:
Resonance production in p+p, p+A and A+A collisions measured with HADES
Autorzy:
Lorenz, M.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
Kotte, R.
Golubeva, M.
Yurevich, S.
Huck, P.
Gonzáalez-Díaz, D.
Böhmer, M.
Mangiarotti, A.
Müntz, C.
Siebenson, J.
Kämpfer, B.
Michel, J.
Gill, K.
Harabasz, Szymon
Sturm, C.
Traxler, M.
Ivashkin, A.
Blanco, A.
Garzón, J. A.
Przygoda, Witold
Weber, M.
Krása, A.
Rehnisch, L.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Pałka, Marek
Pietraszko, J.
Naumann, L.
Blume, C.
Krebs, E.
Ierusalimov, A.
Pechenov, V.
Belver, D.
Rustamov, A.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Reshetin, A.
Salabura, Piotr
Schuldes, H.
Kurilkin, P.
Lang, S.
Dritsa, C.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
Ströbele, H.
Guber, F.
Jurkovic, M.
Korcyl, Grzegorz
Höhne, C.
Fonte, P.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Kurilkin, A.
Parpottas, Y.
Kurepin, A.
Dybczak, Adrian
Spataroe, S.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Tsertos, H.
Teilab, K.
Kuc, Hubert
Metag, V.
Scheib, T.
Wendisch, C.
Krizek, F.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Behnke, C.
Wüstenfeld, J.
Strzempek, Paweł
Berger-Chen, J. C.
Svoboda, O.
Belyaev, A.
Agakishiev, G.
Zanevsky, Y.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
The knowledge of baryonic resonance properties and production cross sections plays an important role for the extraction and understanding of medium modifications of mesons in hot and/or dense nuclear matter. We present and discuss systematics on dielectron and strangeness production obtained with HADES on p+p, p+A and A+A collisions in the few GeV energy regime with respect to these resonances.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
Autorzy:
Kugler, A.
Tlusty, P.
Schmah, A.
Agakishiev, G.
Kolb, B. W.
Friese, J.
Gernhäuser, R.
Gumberidze, M.
Holzmann, R.
Zumbruch, P.
Sailer, B.
Pietraszko, J.
Liu, T.
Karavicheva, T.
Dybczak, Adrian
Christ, T.
Tsertos, H.
Wiśniowski, Marcin
Kurepin, A.
Otwinowski, Jacek
Ramstein, B.
Pachmayer, Y. C.
Traxler, M.
Roy-Stephan, M.
Kotte, R.
Sturm, C.
Kanaki, K.
Wüstenfeld, J.
Koenig, I.
Iori, I.
Perez Cavalcanti, T.
Trębacz, Radosław
Markert, J.
Yurevich, S.
Michalska, Beata
Gilardi, C.
Toia, A.
Golubeva, M.
Wojcik, T.
Cabanelas, P.
Spruck, B.
Destefanis, M.
Sobolev, Yu. G.
Ströbele, H.
Hennino, T.
Sadovsky, A.
Bałanda, Andrzej
Eberl, T.
Krizek, F.
Pechenova, O.
Finocchiaro, P.
Alvarez-Pol, H.
Mousa, J.
Fateev, O.
Galatyuk, T.
Guber, F.
Ierusalimov, A.
Schwab, E.
Teilab, K.
Pospísil, V.
Kämpfer, B.
Lang, S.
Naumann, L.
González-Díaz, D.
Kożuch, Anna
Sánchez, M.
Boyard, J. L.
Kühn, W.
Spataro, S.
Maier, L.
Bokemeyer, H.
Jurkovic, M.
Garzón, J. A.
Stroth, J.
Rustamov, A.
Koenig, W.
Müntz, C.
Wagner, V.
Pechenov, V.
Metag, V.
Morinière, E.
Tarantola, A.
Münch, C.
Böhmer, M.
Dohrmann, F.
Lapidus, K.
Salabura, Piotr
Zanevsky, Y.
Fröhlich, I.
Chernenko, S.
Reshetin, A.
Fabbietti, L.
Ivashkin, A.
Bassini, R.
Przygoda, Witold
Opis:
Data on inclusive dielectron production are presented for the reaction p+p at 2.2 GeV measured with the high acceptance dielectron spectrometer (HADES). Our results supplemented data obtained earlier in this bombarding energy regime with the dilepton spectrometer (DLS) and HADES. The comparison with the 2.09 GeV DLS data is discussed. The reconstructed $e^{+}e^{−}$ pair distributions are confronted with simulations, revealing an excess yield at invariant masses around 0.5 GeV/c$^{2}$. Inclusive cross sections of neutral pion and \eta production are obtained.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Investigation of the $\Sigma ^{0}$ production mechanism in p(3.5 GeV)+p collisions
Autorzy:
Krueger, W.
Zumbruch, P.
Zherebtsova, E.
Blanco, A.
Garzón, J. A.
Spies, S.
Galatyuk, T.
Kohls, M.
Przygoda, Witold
Korcyl, Grzegorz
Kunz, T.
Gumberidze, M.
Arnold, O.
Parpottas, Y.
Fröhlich, I.
Friese, J.
Kämpfer, B.
Pietraszko, J.
Dreyer, J.
Schild, N.
Svoboda, O.
Nowakowski, Krzysztof
Fabbietti, L.
Orliński, J.
Metag, V.
Hojeij, F.
Seck, F.
Idzik, M.
Michel, J.
Rathod, N.
Fonte, P.
Weber, A. A.
Chudoba, P.
Wendisch, C.
Markert, J.
Schwab, E.
Tlusty, P.
Molenda, A.
Koenig, I.
Höhne, C.
Kugler, A.
Pechenova, O.
Zieliński, Marcin
Kornakov, G.
Esmail, W.
Wagner, V.
Prozorov, A.
Koenig, W.
Lalik, Rafał
Kardan, B.
Nabroth, M.
Böhmer, M.
Stefaniak, M.
Huck, H.
Pechenov, V.
Kedych, V.
Malige, Akshay
Müntz, C.
Blume, C.
Carolino, N.
Salabura, Piotr
Grunwald, M.
Holzmann, R.
Bergmann, P.
Stroth, J.
Lopes, L.
Naumann, L.
Ritman, J.
Rustamov, A.
Sturm, C.
Tsertos, H.
Linz, F.
Piasecki, K.
Singh, Udai
Otto, J. -H.
Traxler, M.
Zbroszczyk, H. P.
Kotte, R.
Becker, M.
Ciepał, Izabela
Szala, M.
Chlad, L.
Ströbele, H.
Kolas, J.
Sumara, Konrad
Ramstein, B.
Lorenz, M.
Harabasz, S.
Yassine, R. Abou
Parschau, M.
Rost, A.
Opis:
The production of $\Sigma^{0}$ hyperons in proton proton collisions at a beam kinetic energy of 3.5 GeV impinging on a liquid hydrogen target was investigated using data collected with the HADES setup. The total production cross section is found to be $\sigma(pK^{+} \Sigma^{0})$ = 17.7 $\pm$ 1.7(stat) $\pm$ 1.6(syst) μb. Differential cross section distributions of the exclusive channel $pp \to pK^{+} \Sigma^{0}$ were analyzed in the center-of-mass, Gottfried–Jackson and helicity reference frames for the first time at the excess energy of 556 MeV. The data support the interplay between pion and kaon exchange mechanisms and clearly demonstrate the contribution of interfering nucleon resonances decaying to $K^{+} \Sigma^{0}$. The Bonn–Gatchina partial wave analysis was employed to analyse the data. Due to the limited statistics, it was not possible to obtain an unambiguous determination of the relative contribution of intermediate nucleon resonances to the final state. However nucleon resonances with masses around 1.710 GeV/c$^{2}$ (N* (1710)) and 1.900 GeV/c$^{2}$ N* (1900) or $\Delta$* (1900)) are preferred by the fit.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Hades experiments : investigation of hadron in-medium properties
Autorzy:
Kugler, A.
Tlusty, P.
Huck, P.
Agakishiev, G.
Siebenson, J.
Kolb, B. W.
Friese, J.
Gumberidze, M.
Holzmann, R.
Mangiarotti, A.
Harabasz, Szymon
Pietraszko, J.
Belver, D.
Lopes, L.
Krása, A.
Ladygin, V.
Lorenz, M.
Michel, J.
Karavicheva, T.
Weber, M.
Dybczak, Adrian
Tsertos, H.
Belyaev, A.
Kurepin, A.
Ramstein, B.
Svoboda, O.
Traxler, M.
Kotte, R.
Sturm, C.
Lalik, R.
Wüstenfeld, J.
Koenig, I.
Kurilkin, P.
Markert, J.
Kornakov, G.
Yurevich, S.
Epple, E.
Scheib, T.
Golubeva, M.
Parpottas, Y.
Kurilkin, A.
Dritsa, C.
Behnke, C.
Cabanelas, P.
Sobolev, Yu. G.
Rehnisch, L.
Strzempek, Paweł
Ströbele, H.
Hennino, T.
Sadovsky, A.
Korcyl, Grzegorz
Höhne, C.
Krizek, F.
Pechenova, O.
Schuldes, H.
Wendisch, C.
Fateev, O.
Fonte, P.
Galatyuk, T.
Guber, F.
Ierusalimov, A.
Gonázlez-Díaz, D.
Teilab, K.
Kämpfer, B.
Lang, S.
Berger-Chen, J. C.
Blanco, A.
Vasiliev, T.
Naumann, L.
Spataro, S.
Krebs, E.
Maier, L.
Blume, C.
Jurkovic, M.
Pałka, Marek
Garzón, J. A.
Stroth, J.
Rustamov, A.
Koenig, W.
Müntz, C.
Wagner, V.
Kuc, Hubert
Lebedev, A.
Pechenov, V.
Metag, V.
Münzer, R.
Tarantola, A.
Böhmer, M.
Gill, K.
Lapidus, K.
Salabura, Piotr
Zanevsky, Y.
Fröhlich, I.
Chernenko, S.
Reshetin, A.
Fabbietti, L.
Ivashkin, A.
Przygoda, Witold
Opis:
Hadron modifications in nuclear matter are discussed in connection to chiral symmetry restoration and/or hadronic many body effects. Experiments with photon, proton and heavy ion beams are used to probe properties of hadrons embedded in nuclear matter at different temperatures and densities. Most of the information has been gathered for the light vector mesons $\rho$, $\omega$ and $\phi$. HADES is a second generation experiment operating at GSI with the main aim to study in-medium modifications by means of dielectron production at the SIS18/Bevelac energy range. Large acceptance and excellent particle identification capabilities allows also for measurements of strangeness production. These abilities combined with the variety of beams provided by the SIS18 allow for a characterization of properties of the dense baryonic matter properties created in heavy ion collisions at these energies. A review of recent experimental results obtained by HADES is presented, with main emphasis on hadron properties in nuclear matter.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Searching a dark photon with HADES
Autorzy:
Lorenz, M.
Chernenko, S.
Iori, I.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
Petousis, V.
Kotte, R.
Golubeva, M.
Yurevich, S.
Böhmer, M.
Mangiarotti, A.
Müntz, C.
Siebenson, J.
Kämpfer, B.
Michel, J.
Sturm, C.
Traxler, M.
Schwab, E.
Ivashkin, A.
Blanco, A.
Garzón, J. A.
Przygoda, Witold
Weber, M.
Krása, A.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Göbel, K.
Pachmayer, Y. C.
Pałka, Marek
Pietraszko, J.
Boyard, J. L.
Naumann, L.
Ierusalimov, A.
Pechenov, V.
Belver, D.
Rustamov, A.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Reshetin, A.
Salabura, Piotr
Gernhäuser, R.
Schuldes, H.
Lang, S.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
González-Díaz, D.
Krücken, R.
Ströbele, H.
Guber, F.
Spruck, B.
Jurkovic, M.
Michalska, Beata
Fonte, P.
Heinz, T.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Parpottas, Y.
Kurepin, A.
Dybczak, Adrian
Kühn, W.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Fateev, O.
Tsertos, H.
Teilab, K.
Kuc, Hubert
Metag, V.
Scheib, T.
Wendisch, C.
Krizek, F.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Schmah, A.
Wüstenfeld, J.
Berger-Chen, J. C.
Bałanda, Andrzej
Belyaev, A.
Liu, T.
Agakishiev, G.
Zanevsky, Y.
Trębacz, Radosław
Finocchiaro, P.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
We present a search for the $e^{+}e^{-}$ decay of a hypothetical dark photon, also named U vector boson, in inclusive dielectron spectra measured by HADES in the p(3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared $\epsilon ^{2}$ at 90% CL has been obtained for the mass range $M_{U}$=0.02-0.55 GeV/$c^{2}$ and is compared with the present world data set. For masses 0.03-0.1 GeV/$c^{2}$, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favored by the muon g−2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 $\times 10^{-6}$ has been set on the helicity-suppressed direct decay of the eta meson, $\eta \rightarrow e^{+}e^{-}$, at 90% CL.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 164

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