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Wyświetlanie 1-10 z 375
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:
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:
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:
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
Wyświetlanie 1-10 z 375

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