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Wyszukujesz frazę "Kolb, B.W." wg kryterium: Autor


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:
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
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:
First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter
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.
Ierusalimov, A.
Pechenov, V.
Belver, D.
Rustamov, A.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Reshetin, A.
Salabura, Piotr
Gernhäuser, R.
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.
Mishra, D.
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.
Bałanda, Andrzej
Belyaev, A.
Liu, T.
Agakishiev, G.
Zanevsky, Y.
Trębacz, Radosław
Finocchiaro, P.
Gumberidze, M.
Tarantola, A.
Cabanelas, P.
Opis:
We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the $e^{+} e^{−}$ invariant mass spectra to elementary p + p data, we observe for $e^{+} e^{−}$ momenta $P_{ee}$ < 0.8 GeV / c a strong modification of the shape of the spectrum, which we attribute to an additional $\rho$-like contribution and a decrease of $\omega$ yield. These opposite trends are tentatively interpreted as a strong coupling of the $\rho$ meson to baryonic resonances and an absorption of the $\omega$ meson, which are two aspects of in-medium modification of vector mesons.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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