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Wyświetlanie 1-10 z 61
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:
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:
Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb
Autorzy:
Lorenz, M.
Chernenko, S.
Iori, I.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
Kotte, R.
Golubeva, M.
Yurevich, S.
Böhmer, M.
Mangiarotti, A.
Zanevsky, Y. V.
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.
Belyaev, A. V.
Salabura, Piotr
Gernhäuser, R.
Lang, S.
Balanda, A.
Arnold, O.
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.
Tsertos, H.
Teilab, K.
Kuc, Hubert
Metag, V.
Wendisch, C.
Krizek, F.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Fateev, O. V.
Sobolev, Yu. G.
Tlusty, P.
Schmah, A.
Wüstenfeld, J.
Berger-Chen, J. C.
Liu, T.
Agakishiev, G.
Trębacz, Radosław
Finocchiaro, P.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
Results on $\Lambda$ hyperon production are reported for collisions of p(3.5 GeV) + Nb , studied with the High-Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleon-nucleon collisions, $y_{cm}$ = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The $\Lambda$ phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for \Lambda production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing $\Lambda$ polarization in the weak decay $\Lambda \rightarrow p\pi ^{-} $. Finite negative values of the polarization in the order of 5-20% are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for $p_{t}$ > 300 MeV/c and increases with decreasing rapidity for y < 0.8.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Double pion production in np and pp collisions at 1.25 GeV with HADES
Autorzy:
Lorenz, M.
Chernenko, S.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
Kotte, R.
Golubeva, M.
Yurevich, S.
Huck, P.
Böhmer, M.
Mangiarotti, A.
Müntz, C.
Siebenson, J.
Kämpfer, B.
Michel, J.
Gill, K.
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.
Spataro, S.
González-Díaz, D.
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
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.
Behnke, C.
Wüstenfeld, J.
Strzempek, Paweł
Harabasz, S.
Berger-Chen, J. C.
Svoboda, O.
Belyaev, A.
Agakishiev, G.
Zanevsky, Y.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
The results of double pion production in np and pp collisions at an incident beam energy of 1.25 GeV with the HADES spectrometer at GSI are presented. The np-reactions were studied in d p collisions at 1.25 GeV/u using Forward Wall hodoscope aimed at registering spectator protons. High statistic invariantmass and angular distributions are obtained within the HADES acceptance which are compared with phase-space distributions.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Medium effects in proton-induced $K^{0}$ production at 3.5 GeV
Autorzy:
Lorenz, M.
Chernenko, S.
Iori, I.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
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.
Gaitanos, T.
Ierusalimov, A.
Pechenov, V.
Belver, D.
Rustamov, A.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Reshetin, A.
Salabura, Piotr
Gernhäuser, R.
Arnold, O.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
González-Díaz, D.
Krücken, R.
Kunz, T.
Ströbele, H.
Guber, F.
Spruck, B.
Weil, J.
Jurkovic, M.
Korcyl, Grzegorz
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.
Wendisch, C.
Krizek, F.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Schmah, A.
Wüstenfeld, J.
Berger-Chen, J. C.
Belyaev, A.
Agakishiev, G.
Zanevsky, Y.
Finocchiaro, P.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
We present the analysis of the inclusive $K^{0}$ production in p+p and p+Nb collisions measured with the HADES detector (GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt) at a beam kinetic energy of 3.5 GeV. Data are compared to the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model. The data suggest the presence of a repulsive momentum-dependent kaon potential as predicted by the chiral perturbation theory (ChPT). For the kaon at rest and at normal nuclear density, the ChPT potential amounts to $\approx$ 35 MeV. A detailed tuning of the kaon production cross sections implemented in the model has been carried out to reproduce the experimental data measured in p+p collisions. The uncertainties in the parameters of the model were examined with respect to the sensitivity of the experimental results from p+Nb collisions to the in-medium kaon potential.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 61

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