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Tytuł:
Measurement of global polarization of $\Lambda$ hyperons in few-GeV heavy-ion collisions
Autorzy:
Lorenz, M.
Pechenova, O.
Galatyuk, T.
Markert, J.
Parschau, M.
Kotte, R.
Prozorov, A.
Asal, C.
Krueger, W.
Belounnas, A.
Rodriguez-Ramos, P.
Kedych, V.
Idzik, M.
Linev, S.
Adamczewski-Musch, J.
Müntz, C.
Chlad, L.
Kämpfer, B.
Michel, J.
Piasecki, K.
Spies, S.
Saraiva, J.
Traxler, M.
Schwab, E.
Blanco, A.
Przygoda, Witold
Selyuzhenkov, I.
Förtsch, J.
Zbroszczyk, H.P.
Lalik, Rafał
Nowakowski, Krzysztof
Pietraszko, J.
Grunwald, M.
Naumann, L.
Blume, C.
Povar, T.
Kardan, B.
Pechenov, V.
Otto, J.-H.
Chudoba, P.
Ciepał, Izabela
Rustamov, A.
Malige, Akshay
Gniazdowski, T.
Fröhlich, I.
Hojeij, F.
Koenig, I.
Stroth, J.
Sumara, Konrad
Friese, J.
Cordts, M.
Stefaniak, M.S.
Salabura, Piotr
Lopes, L.
Holzmann, R.
Ritman, J.
Ströbele, H.
Kampert, K-H.
Pauly, C.
Höhne, C.
Lebedev, S.
Floersheimer, H.
Becker, M.
Pysz, K.
Fonte, P.
Kres, I.
Smyrski, Jerzy
Abou Yassine, R.
Schild, N.
Heinz, T.
Linz, F.
Wirth, J.
Skorpil, L.
Esmail, W.A.
Kugler, A.
Scozzi, F.
Kornakov, G.
Weber, A.A.
Rost, A.
Pfeifer, D.
Wasiluk, M.
Singh, Udai
Koenig, W.
Wagner, V.
Kolas, J.
Metag, V.
Wendisch, C.
Zieliński, Marcin
Nabroth, M.
Ramstein, B.
Seck, F.
Fabbietti, L.
Tlusty, P.
Huck, H.
Greifenhagen, R.
Harabasz, S.
Svoboda, O.
Zherebtsova, E.
Zumbruch, P.
Maurus, S.
Molenda, A.
Matulewicz, T.
Rathod, Narendra
Orliński, J.
Gumberidze, M.
Kohls, M.
Szala, M.
Dreyer, J.
Opis:
The global polarization of Λ hyperons along the total orbital angular momentum of a relativistic heavy-ion collision is presented based on the high statistics data samples collected in Au+Au collisions at $\sqrt{^{s}NN}$ = 2.4 GeV and Ag+Ag at 2.55 GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at GSI, Darmstadt. This is the first measurement below the strangeness production threshold in nucleon-nucleon collisions. Results are reported as a function of the collision centrality as well as a function of the hyperon's transverse momentum (p_{T}) and rapidity (y_{CM}) for the range of centrality 0–40%. We observe a strong centrality dependence of the polarization with an increasing signal towards peripheral collisions. For mid-central (20 – 40%) collisions the polarization magnitudes are $\left< P_{\Lambda}\right>$ (%) = 6.8 $\pm$ 1.3 (stat.) $\pm$ 2.1 (syst.) for Au+Au and $\left< P_{\Lambda}\right>$ (%) = 6.2 $\pm$ 0.4 (stat.) $\pm$ 0.6 (syst.) for Ag+Ag, which are the largest values observed so far. This observation thus provides a continuation of the increasing trend previously observed by STAR and contrasts expectations from recent theoretical calculations predicting a maximum in the region of collision energies about 3 GeV. The observed polarization is of a similar magnitude as predicted by 3D-fluid-dynamics and the UrQMD plus thermal vorticity model and significantly above results from the AMPT model.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
HADES results in elementary reactions
Autorzy:
Lorenz, M.
Chernenko, S.
Schmidt-Sommerfeld, K.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Silva, L.
Markert, J.
Petousis, V.
Kotte, R.
Golubeva, M.
Böhmer, M.
Mangiarotti, A.
Adamczewski-Musch, J.
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
Krása, A.
Rehnisch, L.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Franco, C.
Pałka, Marek
Biernat, Jacek
Pietraszko, J.
Naumann, L.
Blume, C.
Krebs, E.
Ierusalimov, A.
Pechenov, V.
Rustamov, A.
Bordalo, P.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Reshetin, A.
Salabura, Piotr
Schuldes, H.
Kurilkin, P.
Arnold, O.
Kolb, B. W.
Hlavac, S.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
Kunz, T.
Ströbele, H.
Guber, F.
Sellheim, P.
Jurkovic, M.
Korcyl, Grzegorz
Höhne, C.
Fonte, P.
Mahmoud, T.
Wirth, J.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Rost, A.
Kurilkin, A.
Parpottas, Y.
Kurepin, A.
Dybczak, Adrian
Deveaux, C.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Kardan, K.
Fateev, O.
Tsertos, H.
Teilab, K.
Kuc, Hubert
Metag, V.
Scheib, T.
Wendisch, C.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Atomssa, E. T.
Behnke, C.
Wüstenfeld, J.
Strzempek, Paweł
Berger-Chen, J. C.
Svoboda, O.
Zumbruch, P.
Zanevsky, Y.
Gumberidze, M.
Tarantola, A.
Opis:
Recent results obtained with the HADES experimental set-up at GSI are presented with a focus on dielectron production and strangeness in pp and quasi-free np reactions. Perspectives related to the very recent experiment using the pion beam at GSI are also discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Measurement of the quasi free $np \rightarrow np\pi^{+} \pi^{-}$ and $np \rightarrow pp\pi^{-} \pi^{0}$ reactions at 1.25 GeV With HADES
Autorzy:
Lorenz, M.
Chernenko, S.
Schmidt-Sommerfeld, K.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Silva, L.
Markert, J.
Petousis, V.
Kotte, R.
Golubeva, M.
Yurevich, S.
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
Krása, A.
Rehnisch, L.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Franco, C.
Pałka, Marek
Biernat, Jacek
Pietraszko, J.
Naumann, L.
Blume, C.
Krebs, E.
Ierusalimov, A.
Pechenov, V.
Rustamov, A.
Bordalo, P.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Reshetin, A.
Salabura, Piotr
Schuldes, H.
Kurilkin, P.
Lang, S.
Arnold, O.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
González-Díaz, D.
Kunz, T.
Ströbele, H.
Guber, F.
Sellheim, P.
Jurkovic, M.
Korcyl, Grzegorz
Höhne, C.
Fonte, P.
Wirth, J.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Rost, A.
Kurilkin, A.
Kurepin, A.
Dybczak, Adrian
Deveaux, C.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Kardan, K.
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.
Atomssa, E. T.
Behnke, C.
Wüstenfeld, J.
Strzempek, Paweł
Berger-Chen, J. C.
Svoboda, O.
Belyaev, A.
Zanevsky, Y.
Gumberidze, M.
Tarantola, A.
Opis:
We present the results of two-pion production in tagged quasi-free np collisions at a deutron incident beam energy of 1.25 GeV/c measured with the High-Acceptance Di-Electron Spectrometer (HADES) installed at GSI. The specific acceptance of HADES allowed for the first time to obtain high-precision data on $\pi^{+} \pi^{-}$ and $\pi^{-} \pi^{0}$ production in np collisions in a region corresponding to large transverse momenta of the secondary particles. The obtained differential cross section data provide strong constraints on the production mechanisms and on the various baryon resonance contributions ($\Delta \Delta$, N(1440), N(1520), $\Delta$ (1600)). The invariant mass and angular distributions from the $np \rightarrow np\pi^{+} \pi{-}$ and $np \rightarrow pp \pi^{-} \pi^{0}$ reactions are compared with different theoretical model predictions.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Proton, deuteron and triton flow measurements in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV
Autorzy:
Lorenz, M.
Pechenova, O.
Galatyuk, T.
Silva, L.
Markert, J.
Kotte, R.
Rodriguez-Ramos, P.
Belounnas, A.
Böhmer, M.
Mangiarotti, A.
Adamczewski-Musch, J.
Müntz, C.
Siebenson, J.
Chlad, L.
Kämpfer, B.
Michel, J.
Piasecki, K.
Spies, S.
Sturm, C.
Harabasz, Szymon
Traxler, M.
Schwab, E.
Blanco, A.
Garzón, J. A.
Przygoda, Witold
Selyuzhenkov, I.
Wiebusch, M. G.
Kornas, F.
Franco, C.
Lalik, Rafał
Nowakowski, Krzysztof
Pietraszko, J.
Naumann, L.
Blume, C.
Kardan, B.
Pechenov, V.
Ciepał, Izabela
Wójcik, D.
Rustamov, A.
Malige, Akshay
Bordalo, P.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Salabura, Piotr
Gernhäuser, R.
Ramos, S.
Schuldes, H.
Arnold, O.
Kolb, B. W.
Hlavac, S.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
Kunz, T.
Ströbele, H.
Sellheim, P.
Korcyl, Grzegorz
Höhne, C.
Fonte, P.
Pysz, K.
Smyrski, Jerzy
Mahmoud, T.
Heinz, T.
Wirth, J.
Epple, E.
Kugler, A.
Scozzi, F.
Filip, P.
Kornakov, G.
Rost, A.
Parpottas, Y.
Deveaux, C.
Singh, Udai
Koenig, W.
Wagner, V.
Hennino, T.
Tsertos, H.
Metag, V.
Scheib, T.
Wendisch, C.
Lapidus, K.
Ramstein, B.
Mihaylov, D. M.
Seck, F.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Behnke, C.
Greifenhagen, R.
Berger-Chen, J. C.
Rosier, P.
Svoboda, O.
Zumbruch, P.
Maurus, S.
Matulewicz, T.
Rathod, Narendra
Gumberidze, M.
Kohls, M.
Szala, M.
Dreyer, J.
Opis:
High-precision measurements of flow coefficients v$_{n}$ (n = 1 - 4) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at the SIS18/GSI. Flow coefficients are studied as a function of transverse momentum p$_{t}$ and rapidity y$_{cm}$ over a large region of phase-space and for several classes of collision centrality. A clear mass hierarchy, as expected by relativistic hydrodynamics, is found for the slope of v$_{1}$, dv$_{1}$ / dy' |$_{y'=0}$ where y' is the scaled rapidity, and for v$_{2}$ at mid-rapidity. Scaling with the number of nucleons is observed for the p$_{t}$ dependence of v$_{2}$ and v$_{4}$ at mid-rapidity, which is indicative for nuclear coalescence as the main process responsible for light nuclei formation. v$_{2}$ is found to scale with the initial eccentricity $\left< \epsilon_{2} \right>$, while v$_{4}$ scales with $\left< \epsilon_{2} \right>^{2}$ and $\left< \epsilon_{4} \right>$. The multi-differential high-precision data on v$_{1}$, v$_{2}$, v$_{3}$, and v$_{4}$ provides important constraints on the equation-of-state of compressed baryonic matter.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Time of flight measurement in heavy-ion collisions with the HADES RPC TOF wall
Autorzy:
Lorenz, M.
Chernenko, S.
Schmidt-Sommerfeld, K.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Silva, L.
Markert, J.
Petousis, V.
Kotte, R.
Golubeva, M.
Yurevich, S.
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
Krása, A.
Rehnisch, L.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Franco, C.
Pałka, Marek
Biernat, Jacek
Pietraszko, J.
Naumann, L.
Blume, C.
Krebs, E.
Ierusalimov, A.
Pechenov, V.
Rustamov, A.
Bordalo, P.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Münzer, R.
Reshetin, A.
Salabura, Piotr
Schuldes, H.
Kurilkin, P.
Lang, S.
Arnold, O.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
González-Díaz, D.
Kunz, T.
Ströbele, H.
Guber, F.
Sellheim, P.
Jurkovic, M.
Korcyl, Grzegorz
Höhne, C.
Fonte, P.
Wirth, J.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Rost, A.
Kurilkin, A.
Kurepin, A.
Dybczak, Adrian
Deveaux, C.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Kardan, K.
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.
Atomssa, E. T.
Behnke, C.
Wüstenfeld, J.
Strzempek, Paweł
Berger-Chen, J. C.
Svoboda, O.
Belyaev, A.
Zanevsky, Y.
Gumberidze, M.
Tarantola, A.
Opis:
This work presents the analysis of the performance of the RPC ToF wall of the HADES, located at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. The behavior of the detector is studied in Au+Au collisions at 1.23 AGeV. A main characteristic of the detector is that all the active areas were designed to be electrically shielded in order to operate in high occupancies of the chambers. Here we show the achieved performance regarding efficiency and timing capabilities at different occupancies of this special design after the applied offline corrections to the data. Also the stability of the intrinsic time resolution over time of data taking is presented.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 51

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