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41 results on '"Kornas, F."'

1. Production of hydrogen isotopes and charged pions in p (3.5 GeV) + Nb reactions

Author

Yassine, R. Abou, Arnold, O., Becker, M., Bergmann, P., Blanco, A., Blume, C., Böhmer, M., Carolino, N., Chlad, L., Chudoba, P., Ciepał, I., Dreyer, J., Esmail, W. A., Fabbietti, L., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Grunwald, M., Gumberidze, M., Harabasz, S., Höhne, C., Hojeij, F., Holzmann, R., Huck, H., Idzik, M., Kämpfer, B., Kardan, B., Kedych, V., Koenig, I., Koenig, W., Kohls, M., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Krueger, W., Kugler, A., Kunz, T., Lalik, R., Lopes, L., Lorenz, M., Malige, A., Markert, J., Metag, V., Michel, J., Molenda, A., Müntz, C., Naumann, L., Nowakowski, K., Otto, J. -H., Parpottas, Y., Parschau, M., Pechenov, V., Pechenova, O., Pietraszko, J., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Rost, A., Rustamov, A., Salabura, P., Schild, N., Schwab, E., Seck, F., Singh, U., Spies, S., Stefaniak, M., Ströbele, H., Stroth, J., Sturm, C., Sumara, K., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Wagner, V., Weber, A. A., Wendisch, C., Zbroszczyk, H. P., Zherebtsova, E., Zumbruch, P., Kamys, B., and Sharma, S.

Subjects
Nuclear Experiment
Abstract

The double differential production cross sections, $d^2\sigma/d\Omega dE$, for hydrogen isotopes and charged pions in the reaction of p + Nb at 3.5 GeV proton beam energy have been measured by the High Acceptance DiElectron Spectrometer (HADES). Thanks to the high acceptance of HADES at forward emission angles and usage of its magnetic field, the measured energy range of hydrogen isotopes could be significantly extended in comparison to the relatively scarce experimental data available in the literature. The data provide information about the development of the intranuclear cascade in the proton-nucleus collisions. They can as well be utilized to study the rate of energy/momentum dissipation in the nuclear systems and the mechanism of elementary and composite particle production in excited nuclear matter at normal density. Data of this type are important also for technological and medical applications. Our results are compared to models developed to describe the processes relevant to nuclear spallation (INCL++) or oriented to probe either the elementary hadronic processes in nuclear matter or the behavior of compressed nuclear matter (GiBUU).

Published
2023

2. Proton, deuteron and triton flow measurements in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV

Author

HADES collaboration, Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Greifenhagen, R., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Kämpfer, B., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Lalik, R., Lapidus, K., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

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 is found for the slope of $v_{1}$, $d v_{1}/d y^{\prime}|_{y^{\prime} = 0}$ where $y^{\prime}$ 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 $\langle \epsilon_{2} \rangle$, while $v_{4}$ scales with $\langle \epsilon_{2} \rangle^{2}$ and $\langle \epsilon_{4} \rangle$. 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., Comment: 21 pages, 18 figures, 4 tables; Figs. 11 updated; The manuscript has associated data in the HEPData repository: https://doi.org/10.17182/hepdata.152804

Published
2022
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3. Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Nabroth, M., Naumann, L., Nowakowski, K., Parpottas, Y., Parschau, M., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schild, N., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Sumara, K., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

In nuclear collisions the incident protons generate a Coulomb field which acts on produced charged particles. The impact of these interactions on charged pion transverse-mass and rapidity spectra, as well as on pion-pion momentum correlations is investigated in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV. We show that the low-mt part of the data ($m_t < 0.2$ GeV/c$^2$) can be well described with a Coulomb-modified Boltzmann distribution that also takes changes of the Coulomb field during the expansion of the fireball into account. The observed centrality dependence of the fitted mean Coulomb potential deviates strongly from a $A_{part}^{2/3}$ scaling, indicating that, next to the fireball, the non-interacting charged spectators have to be taken into account. For the most central collisions, the Coulomb modifications of the HBT source radii are found to be consistent with the potential extracted from the single-pion transverse-mass distributions. This finding suggests that the region of homogeneity obtained from two-pion correlations coincides with the region in which the pions freeze-out. Using the inferred mean-square radius of the charge distribution at freeze-out, we have deduced a baryon density, in fair agreement with values obtained from statistical hadronization model fits to the particle yields., Comment: 14 pages, 12 figures, to be published in EPJA

Published
2022
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4. Correlated pion-proton pair emission off hot and dense QCD matter

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., B"ohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fr"ohlich, I., Galatyuk, T., Garzon, J. A., Gernh"auser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., H"ohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., K"ampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., M"untz, C., M"unzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Str"obele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law ^{\alpha}, where is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys., Comment: 9 pages, 9 figures

Published
2020
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5. Production and electromagnetic decay of hyperons: a feasibility study with HADES as a Phase-0 experiment at FAIR

Author

Adamczewski-Musch, J., Belyaev, A., Blanco, A., Blume, C., Charlotte, C., Borisenko, D. S., Chlad, L., Chudoba, P., Ciepał, I., Derichs, A., Dittert, D., Dreyer, J., Esmail, W. A., Fateev, O., Fonte, P., Friese, J., Fröhlich, I., Förtsch, J., Galatyuk, T., Georgadze, I., Golosov, O., Golubeva, M., Greifenhagen, R., Grunwald, M., Grzonka, D., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Heybeck, B., Höhne, C., Holona, M., Holzmann, R., Huck, H., Ierusalimov, A., Imre, M., Ivashkin, A., Kämpfer, B., Kampert, K-H., Kardan, B., Kedych, V., Khomyakov, V., Koenig, I., Koenig, W., Kohls, M., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kozlov, V., Kres, I., Kuboś, J., Kugler, A., Kulessa, P., Ladygin, V., Lalik, R., Galliard, C. Le, Lebedev, A., Lebedev, S., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Malige, A., Markert, J., Matulewicz, T., Michel, J., Morozov, S., Müntz, C., Naumann, L., Nowakowski, K., Orfanitsky, S., Otto, J. -H., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Andrade, G. Perez, Petukhov, O., Pfeifer, D., Piasecki, K., Pietraszko, J., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Regina, J., Reshetin, A., Reznikov, S., Rieger, J. T., Ritman, J., Rodriguez-Ramos, P., Rost, A., Rustamov, A., Salabura, P., Saraiva, J., Schild, N., Schwab, E., Schönning, K., Scozzi, F., Seck, F., Selyuzhenkov, I., Serdyuk, V., Shabanov, A., Singh, U., Smyrski, J., Sobiella, M., Spies, S., Strikhanov, M., Ströbele, H., Stroth, J., Sumara, K., Svoboda, O., Szala, M., Szewczyk, J., Taranenko, A., Tlusty, P., Traxler, M., Wagner, V., Wasiluk, M., Weber, A. A., Wendisch, C., Wintz, P., Włoch, B., Zbroszczyk, H. P., Zherebzova, E., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

A feasibility study has been performed in order to investigate the performance of the HADES detector to measure the electromagnetic decays of the hyperon resonances $\Sigma(1385)^0$, $\Lambda(1405)$ and $\Lambda{\Lambda}(1520)$ as well as the production of double strange baryon systems $\Xi^-$ and $\Lambda\Lambda$ in p+p reactions at a beam kinetic energy of 4.5 GeV. The existing HADES detector will be upgraded by a new Forward Detector, which extends the detector acceptance into a range of polar angles that plays a crucial role for these investigations. The analysis of each channel is preceded by a consideration of the production cross-sections. Afterwards the expected signal count rates using a target consisting of either liquid hydrogen or polyethylene are summarized., Comment: Draft prepared by Rafa{\l} Lalik, James Ritman, Piotr Salabura, 19 pages, 21 figures, 4 tables

Published
2020
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6. Directed, elliptic and higher order flow harmonics of protons, deuterons and tritons in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV

Author

HADES collaboration, Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mamaev, M., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function of centrality, transverse momentum and rapidity in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV. Combining the information from the flow coefficients of all orders allows to construct for the first time, at collision energies of a few GeV, a multi-differential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation-of-state of dense baryonic matter., Comment: 6 pages, 5 figures; Figs. 2, 3 and 5 updated from re-analysis of data including UrQMD model predictions. Plotting error in Fig. 4 corrected; Accepted for publication in Phys. Rev. Lett

Published
2020
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7. Charged pion production in $\mathbf{Au+Au}$ collisions at $\mathbf{\sqrt{s_{NN}}}$ = 2.4$\mathbf{GeV}$

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Glaessel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Muentz, C., Muenzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rathod, N., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Stroebele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ = 1.23 A GeV) in four centrality classes in the range 0 - 40$\%$ of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the world data, but undershoot by $2.5 \sigma$ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations., Comment: 17 pages, 19 figures, 4 tables

Published
2020
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8. Two-Pion production in the second resonance region in $\pi^- p$ collisions with HADES

Author

Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Chernenko, S., Chlad, L., Chudoba, P., Ciepał, I., Deveaux, C., Dittert, D., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kuboś, J., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Pietraszko, J., Prozorov, A. P., Przygoda, W., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schmidt-Sommerfeld, K., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Siebenson, J., Silva, L., Sing, U., Smyrski, J., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Ungethüm, C., Vazquez-Doce, O., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Pion induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means of a partial wave analysis. Using the secondary pion beam at SIS18, the two pion production in the second resonance region has been investigated to unravel the role of the $N(1520) \frac{3}{2}^-$ resonance in the intermediate $\rho$ production. Results on exclusive channels with one pion ($\pi^{-}p$) and two pions ($\pi^{+}\pi^{-}n$, $\pi^{0}\pi^{-}p$) in the final state measured in the $\pi^{-}-p$ reaction at four different pion beam momenta (0.650, 0.685, 0.733, and 0.786 GeV/c) are presented. The excitation function of the different partial waves and $\Delta\pi$, $N\sigma$ and $N\rho$ isobar configurations is obtained, using the Bonn-Gatchina partial wave analysis. The $N(1520) \frac{3}{2}^-$ resonance is found to dominate the $N\rho$ final state with the branching ratio $BR=12.2 \pm 1.9\%$.

Published
2020
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9. Proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions studied with HADES

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., B"ohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fr"ohlich, I., Galatyuk, T., Garzon, J. A., Gernh"auser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., H"ohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., K"ampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., M"untz, C., M"unzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Str"obele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With the help of extensive detector simulations done with IQMD transport model events including nuclear clusters, various nuisance effects influencing the observed proton cumulants have been investigated. Acceptance and efficiency corrections have been applied as a function of fine grained rapidity and transverse momentum bins, as well as considering local track density dependencies. Next, the effects of volume changes within particular centrality selections have been considered and beyond-leading-order corrections have been applied to the data. The efficiency and volume corrected proton number moments and cumulants Kn of orders n = 1, . . . , 4 have been obtained as a function of centrality and phase-space bin, as well as the corresponding correlators C_n . We find that the observed correlators show a power-law scaling with the mean number of protons, i.e. $C_n \propto ^n$, indicative of mostly long-range multi-particle correlations in momentum space. We also present a comparison of our results with Au+Au collision data obtained at RHIC at similar centralities, but higher $\sqrt{s_{NN}}$., Comment: 35 pages, 33 figures

Published
2020
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10. Identical pion intensity interferometry at sqrt(s_{NN})=2.4 GeV

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES at SIS18/GSI. The experimental correlation functions allow the determination of the space-time extent of the corresponding emission sources via a comparison to models. The emission source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal emission angle with respect to the reaction plane, collision centrality and beam energy. For all centralities and transverse momenta, a geometrical distribution of ellipsoidal shape is found in the plane perpendicular to the beam direction with the larger extension perpendicular to the reaction plane. For large transverse momenta, the corresponding eccentricity approaches the initial eccentricity. The eccentricity is smallest for most central collisions, where the shape is almost circular. The magnitude of the tilt angle of the emission ellipsoid in the reaction plane decreases with increasing centrality and increasing transverse momentum. All source radii increase with centrality, largely exhibiting a linear rise with the number of participants, irrespective of transverse momentum. A substantial charge-sign difference of the source radii is found, appearing most pronounced at low transverse momentum. The extracted source parameters are consistent with the extrapolation of their energy dependence down from higher energies., Comment: 20 pages, 19 figures, 7 tables. arXiv admin note: text overlap with arXiv:1811.06213

Published
2019
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11. Strong absorption of hadrons with hidden and open strangeness in nuclear matter

Author

Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Chernenko, S., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kubos, J., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowsk, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Pietraszko, J., Prozorov, A. P., Przygoda, W., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schmidt-Sommerfeld, K., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Siebenson, J., Silva, L., Smyrski, J., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Ungethüm, C., Doce, O. Vazquez, Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present the first observation of K- and \phi absorption within nuclear matter by means of \pi- -induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studied with HADES at SIS18/GSI. The double ratio (K-/K+)W / (K-/K+)C is found to be 0.319 \pm 0.009(stat)+0.014-0.012 (syst) indicating a larger absorption of K- in heavier targets as compared to lighter ones. The measured \phi/K- ratios in \pi-+C and \pi^- +W reactions within the HADES acceptance are found to be equal to $0.55 \pm 0.03(stat)+0.06-0.07$ (syst) and to $0.63 \pm 0.05(stat)-0.11+0.11$ (syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the \phi meson in nuclear medium is strongly coupled to the K- dynamics. The large difference in the \phi production off C and W nuclei is discussed in terms of a strong \phiN in-medium coupling., Comment: 6 pages, 3 figures

Published
2018
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12. Proton, deuteron and triton flow measurements in Au+Au collisions at sNN=2.4 GeV

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Greifenhagen, R., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Kämpfer, B., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Lalik, R., Lapidus, K., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., and Zumbruch, P.

Published
2023
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13. Production and electromagnetic decay of hyperons: a feasibility study with HADES as a phase-0 experiment at FAIR

Author

Adamczewski-Musch, J., Belyaev, A., Blanco, A., Blume, C., Charlotte, C., Borisenko, D. S., Charlotte, C., Chlad, L., Chudoba, P., Ciepał, I., Derichs, A., Dittert, D., Dreyer, J., Esmail, W., Fateev, O., Fonte, P., Friese, J., Fröhlich, I., Förtsch, J., Galatyuk, T., Georgadze, I., Golosov, O., Golubeva, M., Greifenhagen, R., Grunwald, M., Grzonka, D., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Heybeck, B., Höhne, C., Holona, M., Holzmann, R., Huck, H., Ierusalimov, A., Imre, M., Ivashkin, A., Kämpfer, B., Kampert, K-H., Kardan, B., Kedych, V., Khomyakov, V., Koenig, I., Koenig, W., Kohls, M., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kozlov, V., Kres, I., Kuboś, J., Kugler, A., Kulessa, P., Ladygin, V., Lalik, R., Le Galliard, C., Lebedev, A., Lebedev, S., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Malige, A., Markert, J., Matulewicz, T., Michel, J., Morozov, S., Müntz, C., Naumann, L., Nowakowski, K., Orfanitsky, S., Otto, J. -H., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Perez Andrade, G., Petukhov, O., Pfeifer, D., Piasecki, K., Pietraszko, J., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Regina, J., Reshetin, A., Reznikov, S., Rieger, J. T., Ritman, J., Rodriguez-Ramos, P., Rost, A., Rustamov, A., Salabura, P., Saraiva, J., Schild, N., Schwab, E., Schönning, K., Scozzi, F., Seck, F., Selyuzhenkov, I., Serdyuk, V., Shabanov, A., Singh, U., Smyrski, J., Sobiella, M., Spies, S., Strikhanov, M., Ströbele, H., Stroth, J., Sumara, K., Svoboda, O., Szala, M., Szewczyk, J., Taranenko, A., Tlusty, P., Traxler, M., Wagner, V., Wasiluk, M., Weber, A. A., Wendisch, C., Wintz, P., Włoch, B., Zbroszczyk, H. P., Zherebzova, E., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Published
2021
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14. Identical pion intensity interferometry at sNN=2.4GeV: HADES collaboration

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2020
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15. Exploring time like tranistions in pp, πp and AA reactions with HADES

Author

Salabura Piotr, Adamczewski-Musch J., Arnoldi-Meadows B., Belounnas A., Belyaev A., Blanco A., Blume C., Böhmer M., Borisenko S, Chlad L., Chudoba P, Ciepał I., Dittert D., Dreyer J., Esmail W., Dürr M., Fabbietti L., Fateev S., Fonte P., Friese J., Fröhlich I., Förtsch J., Galatyuk T., Gernhäuser R., Golosov O., Golubeva M., Greifenhagen R., Guber F., Gumberidze M., Harabasz S., Hensch R., Höhne C., Holzmann R., Huck H., Ierusalimov A., Ivashkin A., Kämpfer B., Kampert K-H., Kardan B., Koenig I., Koenig W., Kornakov G., Kornas F., Kotte R., Kozela A., Kres I., Kuboś J., Kugler A., Kulesa P., Ladygin V., Lalik R., Lebedev A., Lebedev S., Linev S., Lopes L., Lorenz M., Lykasov G., Mahmoud T., Malige A., Markert J., Matulewicz T., Maurus S., Metag V., Michel J., Morozov S., Müntz C., Naumann L., Nowakowski K., Otto J.-H., Patel V., Pauly C., Pechenov V., Pechenova O., Petukhov O., Pfeifer D., Piasecki K., Pietraszko J., Prozorov A., Przygoda W., Pysz K., Ramstein B., Rathod N., Reshetin A., Ritman L., Rodriguez-Ramos P., Rost A., Salabura P., Scozzi F., Seck F., Selyuzhenkov I., Shabanov I., Singh US, Smyrski J., Spies S., Ströbele H., Stroth J., Stumm J., Svoboda O., Szala M., Tlusty P., Traxler M., Ungethüm C., Vazquez-Doce O., Wagner V., Weber A.A., Wendisch C., Wiebusch M.G., Wintz P., Wirth J., Zhilin A., and Zumbruch P.

Subjects
Physics, QC1-999
Abstract

Radiative transition of an excited baryon to a nucleon with emission of a virtual massive photon converting to dielectron pair (Dalitz decays) provides important information about baryon-photon coupling at low q2 in timelike region. A prominent enhancement in the respective electromagnetic transition Form Factors (etFF) at q2 near vector mesons ρ/ω poles has been predicted by various calculations reflecting strong baryon-vector meson couplings. The understanding of these couplings is also of primary importance for the interpretation of the emissivity of QCD matter studied in heavy ion collisions via dilepton emission. Dedicated measurements of baryon Dalitz decays in proton-proton and pion-proton scattering with HADES detector at GSI/FAIR are presented and discussed. The relevance of these studies for the interpretation of results obtained from heavy ion reactions is elucidated on the example of the HADES results.

Published
2020
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16. Time-Like Baryon Transitions studies with HADES

Author

Ramstein B., Adamczewski-Musch J., Arnold O., Arnoldi-Meadows B., Belounnas A., Belyaev A., Biernat J., Blanco A., Blume C., Böhmer M., Bordalo P., Chlad L., Chudoba P., Ciepał I., Deveaux C., Dittert D., Dreyer J., Fabbietti L., Fateev O., Fonte P., Franco C., Friese J., Fröhlich I., Galatyuk T., Garzón J. A., Gernhäuser R., Gillitzer A., Golubeva M., Greifenhagen R., Guber F., Gumberidze M., Harabasz S., Heinz T., Hennino T., Himmelreich M., Höhne C., Holzmann R., Ierusalimov A., Ivanov V., Ivashkin A., Kämpfer B., Kajetanowicz M., Kampert K-H., Karavicheva T., Kardan B., Khomyakov V., Koenig I., Koenig W., Korcyl G., Kornakov G., Kornas F., Kotte R., Kozela A., Kuboś J., Kugler A., Kunz T., Kurepin A., Kurilkin P., Kushpil V, Ladygin V., Lalik R., Lebedev A., Linev S., Liu M., Lopes L., Lorenz M., Lykasov G., Mahmoud T., Malakhov A., Markert J., Maurus S., Metag V., Michel J., Mihaylov D.M., Mikhaylov V., Morozov S., Müntz C., Naumann L., Nowakowski K., Parpottas Y., Patel V., Pauly C., Pechenov V., Pechenova O., Pereira A., Petousis V., Petukhov O., Pfeifer D., Pietraszko J., Przygoda W., Pysz K., Ramos S., Reshetin A., Ritman L., Rodriguez-Ramos P., Rost A., Sadovsky A., Salabura P., Scheib T., Schuldes H., Schwab E., Scozzi F., Seck F., Sellheim P., Selyuzhenkov I., Silva L., Smyrski J., Sobiella M., Spataro S., Spies S., Ströbele H., Stroth J., Strzempek P., Svoboda O., Szala M., Taranenko A., Tlusty P., Traxler M., Troyan A., Tsertos H., Wagner V., Wendisch C., Wiebusch M.G., Wintz P., Wirth J., Włoch B., Zhilin A., Zinchenko A., Zumbruch P., and Zuschke M.

Subjects
Physics, QC1-999
Abstract

The HADES collaboration uses the e+e− production as a probe of the resonance matter produced in collisions at incident energies of 1-3.5 GeV/nucleon at GSI. Elementary reactions provide useful references for these studies and give information on resonance Dalitz decays (R→Ne+e−). Such processes are sensitive to the structure of time-like electromagnetic baryon transitions in a kinematic range where (off-shell) vector mesons play a crucial role. Results obtained in proton-proton reactions and in a commissioning pion-beam experiment are reported and prospects for future pion beam experiments and for first hyperon Dalitz decay measurements are described. The connection with the investigations of medium effects to be continued with HADES in the next years at SIS18 and SIS100 is also discussed.

Published
2019
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17. First measurement of massive virtual photon emission from N* baryon resonances

Author

Yassine, R. Abou, Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Becker, M., Behnke, C., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Epple, E., Fabbietti, L., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Förtsch, J., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Greifenhagen, R., Grunwald, M., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Höhne, C., Hojeij, F., Holzmann, R., Idzik, M., Kämpfer, B., Kampert, K-H., Kardan, B., Kedych, V., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Krueger, W., Kugler, A., Kunz, T., Lalik, R., Lapidus, K., Linev, S., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Molenda, A., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Otto, J. -H., Parpottas, Y., Parschau, M., Pauly, C., Pechenov, V., Pechenova, O., Pietraszko, J., Povar, T., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schild, N., Schmidt-Sommerfeld, K., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Spataro, S., Spies, S., Stefaniak, M. S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Sumara, K., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Vazquez-Doce, O., Wagner, V., Weber, A. A., Wendisch, C., Wiebusch, M. G., Wirth, J., Zbroszczyk, H. P., Zherebtsova, E., Zumbruch, P., and Zetenyi, M.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

First information on the timelike electromagnetic structure of baryons in the second resonance region has been obtained from measurements of invariant mass and angular distributions in the quasi-free reaction $\pi^- p \to nee$ at $\sqrt{s_{\pi^- p}}$ = 1.49 GeV with the High Acceptance Di-Electron Spectrometer (HADES) detector at GSI using the pion beam impinging on a CH$_2$ target. We find a total cross section $\sigma (\pi^- p \to nee) = 2.97 \pm 0.07^{data} \pm 0.21^{acc} \pm 0.31^{\rm{Z}_{\rm{eff}}} \mu$b. Combined with the Partial Wave Analysis of the concurrently measured two-pion channel, these data sets provide a crucial test of Vector Meson Dominance (VMD) inspired models. The commonly used "strict VMD" approach strongly overestimates the $e^+e^-$ yield. Instead, approaches based on a VMD amplitude vanishing at small $e^+e^-$ invariant masses supplemented coherently by a direct photon amplitude provide a better agreement. A good description of the data is also obtained using a calculation of electromagnetic timelike baryon transition form factors in a covariant spectator-quark model, demonstrating the dominance of meson cloud effects. The angular distributions of $e^+e^-$ pairs demonstrate the contributions of virtual photons with longitudinal polarization, in contrast to real photons. The virtual photon angular dependence supports the dominance of J=3/2, I=1/2 contributions observed in both the $\gamma^{\star} n$ and the $\pi \pi n$ channels., Comment: 8 pages, 3 figures

Published
2022
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18. Correlated pion-proton pair emission off hot and dense QCD matter

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J.C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J.A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B.W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D.M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu.G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M.G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2021
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19. Proton number fluctuations in sqrt(s_NN)= 2.4 GeV Au+Au collisions studied with HADES

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., B\\'ohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fr\\'ohlich, I., Galatyuk, T., Garzon, J. A., Gernh\\'auser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., H\\'ohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., K\\'ampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., M\\'untz, C., M\\'unzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Str\\'obele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Zanevsky, Y., and Zumbruch, P.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With the help of extensive detector simulations done with IQMD transport model events including nuclear clusters, various nuisance effects influencing the observed proton cumulants have been investigated. Acceptance and efficiency corrections have been applied as a function of fine grained rapidity and transverse momentum bins, as well as considering local track density dependencies. Next, the effects of volume changes within particular centrality selections have been considered and beyond-leading-order corrections have been applied to the data. The efficiency and volume corrected proton number moments and cumulants Kn of orders n = 1, . . . , 4 have been obtained as a function of centrality and phase-space bin, as well as the corresponding correlators C_n . We find that the observed correlators show a power-law scaling with the mean number of protons, i.e. $C_n \propto ^n$, indicative of mostly long-range multi-particle correlations in momentum space. We also present a comparison of our results with Au+Au collision data obtained at RHIC at similar centralities, but higher $\sqrt{s_{NN}}$., Comment: 35 pages, 33 figures

Published
2020

20. Identical pion intensity interferometry at $\sqrt{^{s}NN}=2.4$ GeV

Author

Adamczewski-Musch, J., Arnold, O., Bordalo, P., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Chernenko, S., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Behnke, C., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Belounnas, A., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Belyaev, A., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Berger-Chen, J. C., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Biernat, J., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Blanco, A., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Blume, C., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Böhmer, M., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., and Sobolev, Yu. G.

Subjects
FOS: Physical sciences, ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES at SIS18/GSI. The experimental correlation functions allow the determination of the space-time extent of the corresponding emission sources via a comparison to models. The emission source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal emission angle with respect to the reaction plane, collision centrality and beam energy. For all centralities and transverse momenta, a geometrical distribution of ellipsoidal shape is found in the plane perpendicular to the beam direction with the larger extension perpendicular to the reaction plane. For large transverse momenta, the corresponding eccentricity approaches the initial eccentricity. The eccentricity is smallest for most central collisions, where the shape is almost circular. The magnitude of the tilt angle of the emission ellipsoid in the reaction plane decreases with increasing centrality and increasing transverse momentum. All source radii increase with centrality, largely exhibiting a linear rise with the number of participants, irrespective of transverse momentum. A substantial charge-sign difference of the source radii is found, appearing most pronounced at low transverse momentum. The extracted source parameters are consistent with the extrapolation of their energy dependence down from higher energies., Comment: 20 pages, 19 figures, 7 tables. arXiv admin note: text overlap with arXiv:1811.06213

Published
2020

21. Identical pion intensity interferometry at √sNN=2.4GeV : HADES collaboration

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Bohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Frohlich, I., Galatyuk, T., Garzon, J. A., Gernhauser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Hohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Muntz, C., Munzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Y. G., Spataro, S., Spies, S., Strobele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2020

22. Charged-pion production in Au + Au collisions at $\sqrt{^{s}NN}=2.4$ GeV

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, Izabela, Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gläßel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, Szymon, Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, Grzegorz, Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, Rafał, Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, Akshay, Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, Krzysztof, Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, Witold, Pysz, K., Ramos, S., Ramstein, B., Rathod, Narendra, Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, Piotr, Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, Udai, Smyrski, Jerzy, Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2020

23. Charged-pion production in Au+ Au collisions at √sNN=2.4GeV : HADES Collaboration

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Bohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Frohlich, I., Galatyuk, T., Garzon, J. A., Gernhauser, R., Glassel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Hohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Muntz, C., Munzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Y. G., Spataro, S., Spies, S., Strobele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2020

24. Charged-pion production in $\mathbf {Au+Au}$ collisions at $\sqrt{\mathbf {s}_{\mathbf {NN}}} = 2.4~{\mathbf {GeV}}$

Author

Adamczewski-Musch, J., Arnold, O., Chernenko, S., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Chlad, L., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, Michael, Ciepał, I., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., HADES collaboration, Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Behnke, C., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gläßel, S., Golubeva, M., Greifenhagen, R., Guber, F., Belounnas, A., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Belyaev, A., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Berger-Chen, J. C., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Blanco, A., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Blume, C., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Böhmer, M., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Bordalo, P., Rost, Adria, Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., and Sellheim, P.

Subjects
production [pi], 2.4 GeV-cms/nucleon, rapidity, HADES, transverse [mass], transport theory, ddc:530, angular distribution, multiplicity [pi], transverse momentum, Nuclear Experiment, impact parameter, energy [beam]
Abstract

We present high-statistic data on charged-pion emission from Au + Au collisions at $\sqrt{s_{\mathrm{NN}}} = 2.4~\hbox {GeV}$ (corresponding to $E_{beam} = 1.23~\hbox {A GeV}$) in four centrality classes in the range 0–40% of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the available world data, but undershoot by $2.5~\sigma $ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations.

Published
2020

25. Two-pion production in the second resonance region in π-p collisions with the High-Acceptance Di-Electron Spectrometer (HADES)

Author

Adamczewski-Musch, J., Arnold, O., Atomssa, E. T., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, Jacek, Blanco, A., Blume, C., Böhmer, M., Chernenko, S., Chlad, L., Chudoba, P., Ciepał, Izabela, Deveaux, C., Dittert, D., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, Szymon, Heinz, T., Hennino, T., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, Grzegorz, Kornakov, G., Kornas, F., Kotte, R., Kuboś, J., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, Rafał, Lapidus, K., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, Akshay, Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, Krzysztof, Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Pietraszko, J., Prozorov, AP, Przygoda, Witold, Ramstein, B., Rathod, Narendra, Reshetin, A., Rodriguez-Ramos, P., Rost, A., Sadovsky, A., Salabura, Piotr, Scheib, T., Schmidt-Sommerfeld, K., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Siebenson, J., Silva, L., Singh, Udai, Smyrski, Jerzy, Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, Paweł, Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Ungethüm, C., Vazquez-Doce, O., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., Sarantsev, A. V., Nikonov, V. A., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and HADES

Subjects
N(1520), baryon resonance, Nuclear Theory, partial wave analysis, production: two-pion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], HADES, beam: momentum, High Energy Physics::Experiment, pi: beam, branching ratio, Nuclear Experiment, Nucleon-Nucleon Interaction, pi- p: scattering, Few-Body Systems, experimental results
Abstract

International audience; Pion-induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means of a partial-wave analysis. Using the secondary pion beam at SIS18, the two-pion production in the second resonance region has been investigated to unravel the role of the N(1520)32− resonance in the intermediate ρ-meson production. Results on exclusive channels with one pion (π−p) and two pions (π+π−n, π0π−p) in the final state measured in the π−-p reaction at four different pion beam momenta (0.650, 0.685, 0.733, and 0.786 GeV/c) are presented. The excitation function of the different partial waves and Δπ, Nσ, and Nρ isobar configurations is obtained, using the Bonn-Gatchina partial-wave analysis. The N(1520)32− resonance is found to dominate the Nρ final state with the branching ratio BR=12.2%±1.9%.

Published
2020

26. Charged pion production in Au+Au collisions at sqrt(s_NN) = 2.4 GeV

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Glaessel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Muentz, C., Muenzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rathod, N., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Y. G., Spataro, S., Spies, S., Stroebele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present high-statistic data on charged pion emission from Au+Au collisions at sqrt(s_NN) = 2.4 GeV (corresponding to E_beam = 1.23 A GeV) in four centrality classes in the range 0 - 40% of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the world data, but undershoot by 2.5σ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations.

Published
2020

27. Directed, elliptic and higher order flow harmonics of protons, deuterons and tritons in Au+Au collisions at sqrt(s_NN)=2.4 GeV

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mamaev, M., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Y. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Flow coefficients v_{n} of the orders n=1-6 are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in Au+Au collisions at sqrt[s_{NN}]=2.4 GeV. Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation of state of dense baryonic matter.

Published
2020

28. Proton-number fluctuations in sNN =2.4 GeV Au + Au collisions studied with the High-Acceptance DiElectron Spectrometer (HADES) PROTON-NUMBER FLUCTUATIONS in sNN =2.4 GeV Au + Au ... J. ADAMCZEWSKI-MUSCH et al

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Bohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Frohlich, I., Galatyuk, T., Garzon, J. A., Gernhauser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Hohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Muntz, C., Munzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Y. G., Spataro, S., Spies, S., Strobele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., and Zumbruch, P.

Published
2020

29. Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons in $\mathrm{Au}+\mathrm{Au}$ Collisions at $\sqrt{{s}_{NN}}=2.4\text{ }\text{ }\mathrm{GeV}$

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J.C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J.A., Gernhäuser, R., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B.W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mamaev, M., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D.M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M.G., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and HADES

Subjects
flow: higher-order, deuteron, heavy ion: scattering, elliptic flow, Nuclear Theory, transverse momentum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 2.4 GeV-cms/nucleon, rapidity, HADES, spectrometer, Nuclear Experiment, Nuclear Physics, fluid, experimental results
Abstract

International audience; Flow coefficients vn of the orders n=1–6 are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in Au+Au collisions at sNN=2.4 GeV. Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation of state of dense baryonic matter.

Published
2020

30. Charged-pion production in $\mathbf {Au+Au}$ collisions at $\sqrt{\mathbf {s}_{\mathbf {NN}}} = 2.4~{\mathbf {GeV}}$: HADES Collaboration

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J.C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J.A., Gernhäuser, R., Gläßel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B.W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D.M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M.G., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and HADES

Subjects
pi: multiplicity, mass: transverse, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], pi: production, transverse momentum, beam: energy, 2.4 GeV-cms/nucleon, rapidity, HADES, transport theory, angular distribution, Nuclear Experiment, impact parameter
Abstract

The European physical journal / A 56(10), 259 (2020). doi:10.1140/epja/s10050-020-00237-2, We present high-statistic data on charged-pion emission from Au + Au collisions at $\sqrt{s_{\mathrm{NN}}} = 2.4~\hbox {GeV}$ (corresponding to $E_{beam} = 1.23~\hbox {A GeV}$) in four centrality classes in the range 0–40% of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the available world data, but undershoot by $2.5~\sigma $ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations., Published by Springer, Heidelberg

Published
2020
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31. Proton-number fluctuations in $\sqrt {s_{NN}}$ =2.4 GeV Au + Au collisions studied with the High-Acceptance DiElectron Spectrometer (HADES)

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, Izabela, Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, Szymon, Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, Grzegorz, Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, Rafał, Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, Akshay, Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, Krzysztof, Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, Witold, Pysz, K., Ramos, S., Ramstein, B., Rathod, Narendra, Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, Piotr, Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, Udai, Smyrski, Jerzy, Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P., Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and HADES

Subjects
fluctuation, correction: efficiency, transverse momentum, Relativistic Nuclear Collisions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], long-range, phase space, 2.4 GeV-cms/nucleon, HADES, transport theory, spectrometer, correlation function, Nuclear Experiment, Brookhaven RHIC Coll, experimental results, acceptance
Abstract

International audience; We present an analysis of proton-number fluctuations in sNN=2.4 GeV Au197+Au197 collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. With the help of extensive detector simulations done with Isospin Quantum Molecular Dynamics (IQMD) transport model events including nuclear clusters, various nuisance effects influencing the observed proton cumulants have been investigated. Acceptance and efficiency corrections have been applied as a function of fine-grained rapidity and transverse momentum bins, as well as considering local track density dependencies. Next, the effects of volume changes within particular centrality selections have been considered and beyond-leading-order corrections have been applied to the data. The efficiency and volume-corrected proton number moments and cumulants Kn of orders n=1, 2, 3, and 4 have been obtained as a function of centrality and phase-space bin, as well as the corresponding correlators Cn. We find that the observed correlators show a power-law scaling with the mean number of protons, i.e., Cn∝〈N〉n, indicative of mostly long-range multiparticle correlations in momentum space. We also present a comparison of our results with Au + Au collision data obtained at the Relativistic Heavy Ion Collider (RHIC) at similar centralities but higher sNN.

Published
2020

32. HADES Collaboration

Author

Adamczewski-Musch, J., primary, Belyaev, A., additional, Blanco, A., additional, Blume, C., additional, Böhmer, M., additional, Asal, C., additional, Chlad, L., additional, Chudoba, P., additional, Ciepał, I., additional, Dittert, D., additional, Dreyer, J., additional, Esmail, W.A., additional, Fabbietti, L., additional, Fateev, O., additional, Fonte, P., additional, Friese, J., additional, Fröhlich, I., additional, Förtsch, J., additional, Galatyuk, T., additional, Gernhäuser, R., additional, Golosov, O., additional, Golubeva, M., additional, Greifenhagen, R., additional, Grunwald, M., additional, Grzonka, D., additional, Guber, F., additional, Gumberidze, M., additional, Harabasz, S., additional, Heybeck, B., additional, Höhne, C., additional, Holzmann, R., additional, Huck, H., additional, Ierusalimov, A., additional, Ivashkin, A., additional, Kämpfer, B., additional, Kampert, K-H., additional, Kardan, B., additional, Kedych, V., additional, Khomyakov, V., additional, Koenig, I., additional, Koenig, W., additional, Kohls, M., additional, Korcyl, G., additional, Kornakov, G., additional, Kornas, F., additional, Kotte, R., additional, Kozela, A., additional, Kres, I., additional, Krueger, W., additional, Kuboś, J., additional, Kugler, A., additional, Kulessa, P., additional, Ladygin, V., additional, Lalik, R., additional, Lebedev, A., additional, Lebedev, S., additional, Linev, S., additional, Lopes, L., additional, Lorenz, M., additional, Lykasov, G., additional, Malige, A., additional, Markert, J., additional, Matulewicz, T., additional, Maurus, S., additional, Metag, V., additional, Michel, J., additional, Morozov, S., additional, Müntz, C., additional, Naumann, L., additional, Nowakowski, K., additional, Otto, J.-H., additional, Patel, V., additional, Pauly, C., additional, Pechenov, V., additional, Pechenova, O., additional, Perez Andrade, G.P., additional, Petukhov, O., additional, Pfeifer, D., additional, Piasecki, K., additional, Pietraszko, J., additional, Prozorov, A., additional, Przygoda, W., additional, Pysz, K., additional, Ramstein, B., additional, Rathod, N., additional, Reshetin, A., additional, Reznikov, S., additional, Ritman, J., additional, Rodriguez-Ramos, P., additional, Rost, A., additional, Rustamov, A., additional, Salabura, P., additional, Saraiva, J., additional, Schild, N., additional, Scozzi, F., additional, Seck, F., additional, Selyuzhenkov, I., additional, Shabanov, A., additional, Singh, U., additional, Smyrski, J., additional, Spies, S., additional, Strikhanov, M., additional, Ströbele, H., additional, Stroth, J., additional, Sumara, K., additional, Svoboda, O., additional, Szala, M., additional, Szewczyk, J., additional, Taranenko, A., additional, Tlusty, P., additional, Traxler, M., additional, Wagner, V., additional, Wasiluk, M., additional, Weber, A.A., additional, Wendisch, C., additional, Wintz, P., additional, Wirth, J., additional, Włoch, B., additional, Zbroszczyk, H.P., additional, Zherebzova, E., additional, Zhilin, A., additional, Zinchenko, A., additional, and Zumbruch, P., additional

Published
2021
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33. Identical pion intensity interferometry at $$\sqrt{s_{\mathrm{NN}}}=2.4~\hbox {GeV}$$

Author

Adamczewski-Musch, J., primary, Arnold, O., additional, Behnke, C., additional, Belounnas, A., additional, Belyaev, A., additional, Berger-Chen, J. C., additional, Biernat, J., additional, Blanco, A., additional, Blume, C., additional, Böhmer, M., additional, Bordalo, P., additional, Chernenko, S., additional, Chlad, L., additional, Deveaux, C., additional, Dreyer, J., additional, Dybczak, A., additional, Epple, E., additional, Fabbietti, L., additional, Fateev, O., additional, Filip, P., additional, Fonte, P., additional, Franco, C., additional, Friese, J., additional, Fröhlich, I., additional, Galatyuk, T., additional, Garzón, J. A., additional, Gernhäuser, R., additional, Golubeva, M., additional, Greifenhagen, R., additional, Guber, F., additional, Gumberidze, M., additional, Harabasz, S., additional, Heinz, T., additional, Hennino, T., additional, Hlavac, S., additional, Höhne, C., additional, Holzmann, R., additional, Ierusalimov, A., additional, Ivashkin, A., additional, Kämpfer, B., additional, Karavicheva, T., additional, Kardan, B., additional, Koenig, I., additional, Koenig, W., additional, Kolb, B. W., additional, Korcyl, G., additional, Kornakov, G., additional, Kornas, F., additional, Kotte, R., additional, Kugler, A., additional, Kunz, T., additional, Kurepin, A., additional, Kurilkin, A., additional, Kurilkin, P., additional, Ladygin, V., additional, Lalik, R., additional, Lapidus, K., additional, Lebedev, A., additional, Lopes, L., additional, Lorenz, M., additional, Mahmoud, T., additional, Maier, L., additional, Mangiarotti, A., additional, Markert, J., additional, Matulewicz, T., additional, Maurus, S., additional, Metag, V., additional, Michel, J., additional, Mihaylov, D. M., additional, Morozov, S., additional, Müntz, C., additional, Münzer, R., additional, Naumann, L., additional, Nowakowski, K., additional, Palka, M., additional, Parpottas, Y., additional, Pechenov, V., additional, Pechenova, O., additional, Petukhov, O., additional, Piasecki, K., additional, Pietraszko, J., additional, Przygoda, W., additional, Ramos, S., additional, Ramstein, B., additional, Reshetin, A., additional, Rodriguez-Ramos, P., additional, Rosier, P., additional, Rost, A., additional, Sadovsky, A., additional, Salabura, P., additional, Scheib, T., additional, Schuldes, H., additional, Schwab, E., additional, Scozzi, F., additional, Seck, F., additional, Sellheim, P., additional, Selyuzhenkov, I., additional, Siebenson, J., additional, Silva, L., additional, Sobolev, Yu. G., additional, Spataro, S., additional, Spies, S., additional, Ströbele, H., additional, Stroth, J., additional, Strzempek, P., additional, Sturm, C., additional, Svoboda, O., additional, Szala, M., additional, Tlusty, P., additional, Traxler, M., additional, Tsertos, H., additional, Usenko, E., additional, Wagner, V., additional, Wendisch, C., additional, Wiebusch, M. G., additional, Wirth, J., additional, Wójcik, D., additional, Zanevsky, Y., additional, and Zumbruch, P., additional

Published
2020
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34. Identical pion intensity interferometry at $$\sqrt{s_{\mathrm{NN}}}=2.4~\hbox {GeV}$$

Author

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wójcik, D., Zanevsky, Y., and Zumbruch, P.

Subjects
ddc
Published
2019

35. Multi-differential pattern of low-mass e(+)e(-) excess from root S-NN=2.4 GeV Au+Au collisions with HADES

Author

Harabasz, S., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

The matter formed in central heavy-ion collisions at a few GeV per nucleon is commonly understood as resonance matter, a gas of nucleons and excited baryon states with a substantial contribution from mesonic, mostly pionic excitations. Yet, in the initial phase of the reaction the system is compressed to beyond nuclear ground state density and hence substantial modifications of the hadron properties are expected to occur. The spectral distribution of virtual photons measured in Au+Au collisions at 2.4 GeV center of mass energy indicates strong medium effects beyond pure superposition of individual NN collisions. We present multi-differential distributions of low-mass electron pairs. This radiation is remarkably well described assuming emission from a thermalized system. To gain deeper understanding of the microscopic origin of the radiation, we extracted the centrality dependent true (not blue-shifted) temperature, its azimuthal distribution, as well as mass-dependent effective slope parameter. Virtual photon spectra are confronted with available model calculations.

Published
2019

36. Sub-threshold strangeness production measured with HADES

Author

Kornakov, G., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

At energies below sqrt(sNN) approximate to 2.55 GeV, strange quarks cannot be produced in binary nucleon-nucleon collisions because of the higher production threshold of the lightest hadrons carrying strangeness. Hence, the investigation of sub-threshold strangeness production in heavy-ion collisions is one of the most promising probes, to access the properties of the created system, as the missing energy must be provided by the latter one. For the first time, a nearly complete set of strange particles has been reconstructed in the 40% most central Au+Au collisions at sqrt(sNN) = 2.42 GeV. The data sample includes multi-differential representations of charged and neutral particles containing strangeness (K+,-,Ks0, φ, Λ). To achieve a better understanding of strangeness production the properties of the short-lived resonances have to be investigated. The first steps in this direction are presented here, including the reconstruction of baryon resonances using a new iterative technique, comparison to microscopic transport model calculations and interpretation of the pion transverse momentum distribution.

Published
2019

37. Collective flow and correlations measurements with HADES in Au plus Au collisions at 1.23 AGeV

Author

Kardan, B., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Boehmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepal, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gillitzer, A., Golosov, O., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hoehne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kaempfer, B., Kajetanowicz, M., Kampert, K.-H., Khomyakov, V., Koenig, I., Koenig, W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kubos, J., Kugler, A., Kunz, T., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Muentz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Prozorov, A. P., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Strikhanov, M., Stroebele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Wloch, B., Zhilin, A., Zinchenko, A., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

The HADES experiment provides a large acceptance combined with a high mass resolution and therefore makes it possible to study dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the high statistics of seven billion Au+Au collisions at 1.23 AGeV recorded in 2012 the investigation of collective effects and particle correlations is possible with unprecedented accuracy. We present multi-differential data on directed (v(1)) and elliptic (v(2)) flow, and the first measurement of triangular flow (v(3)), of protons and deuterons.

Published
2019

38. Time-Like Baryon Transitions studies with HADES

Author

Ramstein, B., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepał, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gillitzer, A., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Himmelreich, M., Höhne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kämpfer, B., Kajetanowicz, M., Kampert, K.-H., Karavicheva, T., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyll, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kuboś, J., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Liu, M., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Müntz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Włoch, B., Zhilin, A., Zinchenko, A., Zumbruch, P., Zuschke, M., Ramstein, B., Adamczewski-Musch, J., Arnold, O., Arnoldi-Meadows, B., Belounnas, A., Belyaev, A., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chlad, L., Chudoba, P., Ciepał, I., Deveaux, C., Dittert, D., Dreyer, J., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gillitzer, A., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Himmelreich, M., Höhne, C., Holzmann, R., Ierusalimov, A., Ivanov, V., Ivashkin, A., Kämpfer, B., Kajetanowicz, M., Kampert, K.-H., Karavicheva, T., Kardan, B., Khomyakov, V., Koenig, I., Koenig, W., Korcyll, G., Kornakov, G., Kornas, F., Kotte, R., Kozela, A., Kuboś, J., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, P., Kushpil, V., Ladygin, V., Lalik, R., Lebedev, A., Linev, S., Liu, M., Lopes, L., Lorenz, M., Lykasov, G., Mahmoud, T., Malakhov, A., Markert, J., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Mikhaylov, V., Morozov, S., Müntz, C., Naumann, L., Nowakowski, K., Parpottas, Y., Patel, V., Pauly, C., Pechenov, V., Pechenova, O., Pereira, A., Petousis, V., Petukhov, O., Pfeifer, D., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Reshetin, A., Ritman, L., Rodriguez-Ramos, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Silva, L., Smyrski, J., Sobiella, M., Spataro, S., Spies, S., Ströbele, H., Stroth, J., Strzempek, P., Svoboda, O., Szala, M., Taranenko, A., Tlusty, P., Traxler, M., Troyan, A., Tsertos, H., Wagner, V., Wendisch, C., Wiebusch, M. G., Wintz, P., Wirth, J., Włoch, B., Zhilin, A., Zinchenko, A., Zumbruch, P., and Zuschke, M.

Abstract

The HADES collaboration uses the e+e− production as a probe of the resonance matter produced in collisions at incident energies of 1-3.5 GeV/nucleon at GSI. Elementary reactions provide useful references for these studies and give information on resonance Dalitz decays (R→Ne+e−). Such processes are sensitive to the structure of time-like electromagnetic baryon transitions in a kinematic range where (off-shell) vector mesons play a crucial role. Results obtained in proton-proton reactions and in a commissioning pion-beam experiment are reported and prospects for future pion beam experiments and for first hyperon Dalitz decay measurements are described. The connection with the investigations of medium effects to be continued with HADES in the next years at SIS18 and SIS100 is also discussed.

Published
2019

39. HADES Collaboration

Author

Adamczewski-Musch, J., primary, Arnold, O., additional, Arnoldi-Meadows, B., additional, Belounnas, A., additional, Belyaev, A., additional, Biernat, J., additional, Blanco, A., additional, Blume, C., additional, Böhmer, M., additional, Bordalo, P., additional, Chlad, L., additional, Chudoba, P., additional, Ciepał, I., additional, Deveaux, C., additional, Dittert, D., additional, Dreyer, J., additional, Fabbietti, L., additional, Fateev, O., additional, Fonte, P., additional, Franco, C., additional, Friese, J., additional, Fröhlich, I., additional, Galatyuk, T., additional, Garzón, J.A., additional, Gernhäuser, R., additional, Gillitzer, A., additional, Golosov, O., additional, Golubeva, M., additional, Greifenhagen, R., additional, Guber, F., additional, Gumberidze, M., additional, Harabasz, S., additional, Heinz, T., additional, Hennino, T., additional, Höhne, C., additional, Holzmann, R., additional, Ierusalimov, A., additional, Ivanov, V., additional, Ivashkin, A., additional, Kämpfer, B., additional, Kajetanowicz, M., additional, Kampert, K.-H., additional, Kardan, B., additional, Khomyakov, V., additional, Koenig, I., additional, Koenig, W., additional, Korcyl, G., additional, Kornakov, G., additional, Kornas, F., additional, Kotte, R., additional, Kozela, A., additional, Kuboś, J., additional, Kugler, A., additional, Kunz, T., additional, Kurilkin, P., additional, Kushpil, V., additional, Ladygin, V., additional, Lalik, R., additional, Lebedev, A., additional, Linev, S., additional, Lopes, L., additional, Lorenz, M., additional, Lykasov, G., additional, Mahmoud, T., additional, Malakhov, A., additional, Markert, J., additional, Maurus, S., additional, Metag, V., additional, Michel, J., additional, Mihaylov, D.M., additional, Mikhaylov, V., additional, Morozov, S., additional, Müntz, C., additional, Naumann, L., additional, Nowakowski, K., additional, Parpottas, Y., additional, Patel, V., additional, Pauly, C., additional, Pechenov, V., additional, Pechenova, O., additional, Pereira, A., additional, Petousis, V., additional, Petukhov, O., additional, Pfeifer, D., additional, Pietraszko, J., additional, Prozorov, A.P., additional, Przygoda, W., additional, Pysz, K., additional, Ramos, S., additional, Ramstein, B., additional, Reshetin, A., additional, Ritman, L., additional, Rodriguez-Ramos, P., additional, Rost, A., additional, Salabura, P., additional, Scheib, T., additional, Schuldes, H., additional, Schwab, E., additional, Scozzi, F., additional, Seck, F., additional, Sellheim, P., additional, Selyuzhenkov, I., additional, Silva, L., additional, Smyrski, J., additional, Sobiella, M., additional, Spataro, S., additional, Spies, S., additional, Strikhanov, M., additional, Ströbele, H., additional, Stroth, J., additional, Strzempek, P., additional, Svoboda, O., additional, Szala, M., additional, Taranenko, A., additional, Tlusty, P., additional, Traxler, M., additional, Troyan, A., additional, Tsertos, H., additional, Wagner, V., additional, Wendisch, C., additional, Wiebusch, M.G., additional, Wintz, P., additional, Wirth, J., additional, Włoch, B., additional, Zhilin, A., additional, Zinchenko, A., additional, and Zumbruch, P., additional

Published
2019
Full Text
View/download PDF

40. Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons in Au+Au Collisions at sqrt[s&#95;{NN}]=2.4  GeV.

Author

Adamczewski-Musch J, Arnold O, Behnke C, Belounnas A, Belyaev A, Berger-Chen JC, Blanco A, Blume C, Böhmer M, Bordalo P, Chernenko S, Chlad L, Ciepal I, Deveaux C, Dreyer J, Epple E, Fabbietti L, Fateev O, Filip P, Fonte P, Franco C, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Golosov O, Golubeva M, Greifenhagen R, Guber F, Gumberidze M, Harabasz S, Heinz T, Hennino T, Hlavac S, Höhne C, Holzmann R, Ierusalimov A, Ivashkin A, Kämpfer B, Karavicheva T, Kardan B, Koenig I, Koenig W, Kohls M, Kolb BW, Korcyl G, Kornakov G, Kornas F, Kotte R, Kugler A, Kunz T, Kurepin A, Kurilkin A, Kurilkin P, Ladygin V, Lalik R, Lapidus K, Lebedev A, Lopes L, Lorenz M, Mahmoud T, Maier L, Malige A, Mamaev M, Mangiarotti A, Markert J, Matulewicz T, Maurus S, Metag V, Michel J, Mihaylov DM, Morozov S, Müntz C, Münzer R, Naumann L, Nowakowski K, Parpottas Y, Pechenov V, Pechenova O, Petukhov O, Piasecki K, Pietraszko J, Przygoda W, Pysz K, Ramos S, Ramstein B, Rathod N, Reshetin A, Rodriguez-Ramos P, Rosier P, Rost A, Rustamov A, Sadovsky A, Salabura P, Scheib T, Schuldes H, Schwab E, Scozzi F, Seck F, Sellheim P, Selyuzhenkov I, Siebenson J, Silva L, Singh U, Smyrski J, Sobolev YG, Spataro S, Spies S, Ströbele H, Stroth J, Sturm C, Svoboda O, Szala M, Tlusty P, Traxler M, Tsertos H, Usenko E, Wagner V, Wendisch C, Wiebusch MG, Wirth J, Wójcik D, Zanevsky Y, and Zumbruch P

Abstract

Flow coefficients v&#95;{n} of the orders n=1-6 are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in Au+Au collisions at sqrt[s&#95;{NN}]=2.4  GeV. Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation of state of dense baryonic matter.

Published
2020
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41. Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter.

Author

Adamczewski-Musch J, Arnold O, Atomssa ET, Behnke C, Belounnas A, Belyaev A, Berger-Chen JC, Biernat J, Blanco A, Blume C, Böhmer M, Chernenko S, Chlad L, Chudoba P, Ciepał I, Deveaux C, Dittert D, Dreyer J, Epple E, Fabbietti L, Fateev O, Fonte P, Franco C, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Golubeva M, Greifenhagen R, Guber F, Gumberidze M, Harabasz S, Heinz T, Hennino T, Höhne C, Holzmann R, Ierusalimov A, Ivashkin A, Kämpfer B, Kardan B, Koenig I, Koenig W, Kolb BW, Korcyl G, Kornakov G, Kornas F, Kotte R, Kuboś J, Kugler A, Kunz T, Kurepin A, Kurilkin A, Kurilkin P, Ladygin V, Lalik R, Lapidus K, Lebedev A, Linev S, Lopes L, Lorenz M, Mahmoud T, Maier L, Malige A, Markert J, Maurus S, Metag V, Michel J, Mihaylov DM, Mikhaylov V, Morozov S, Müntz C, Münzer R, Naumann L, Nowakowski K, Parpottas Y, Pechenov V, Pechenova O, Petukhov O, Pietraszko J, Prozorov AP, Przygoda W, Ramstein B, Rathod N, Reshetin A, Rodriguez-Ramos P, Rost A, Sadovsky A, Salabura P, Scheib T, Schmidt-Sommerfeld K, Schuldes H, Schwab E, Scozzi F, Seck F, Sellheim P, Siebenson J, Silva L, Smyrski J, Spataro S, Spies S, Ströbele H, Stroth J, Strzempek P, Sturm C, Svoboda O, Szala M, Tlusty P, Traxler M, Tsertos H, Ungethüm C, Vázquez Doce O, Wagner V, Wendisch C, Wiebusch MG, Wirth J, Wójcik D, Zanevsky Y, Zumbruch P, Curceanu C, Piscicchia K, and Scordo A

Abstract

We present the first observation of K^{-} and ϕ absorption within nuclear matter by means of π^{-}-induced reactions on C and W targets at an incident beam momentum of 1.7  GeV/c studied with HADES at SIS18/GSI. The double ratio (K^{-}/K^{+})&#95;{W}/(K^{-}/K^{+})&#95;{C} is found to be 0.319±0.009(stat)&#95;{-0.012}^{+0.014}(syst) indicating a larger absorption of K^{-} in heavier targets as compared to lighter ones. The measured ϕ/K^{-} ratios in π^{-}+C and π^{-}+W reactions within the HADES acceptance are found to be equal to 0.55±0.04(stat)&#95;{-0.07}^{+0.06}(syst) and to 0.63±0.06(stat)&#95;{-0.11}^{+0.11}(syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the ϕ meson in nuclear medium is strongly coupled to the K^{-} dynamics. The large difference in the ϕ production off C and W nuclei is discussed in terms of a strong ϕN in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.

Published
2019
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