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

Author

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

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, 01 natural sciences, ddc, Nuclear physics, Pion, 0103 physical sciences, Transverse mass, Rapidity, Impact parameter, Multiplicity (chemistry), 010306 general physics, Nucleon, Centrality
Abstract

We present high-statistic data on charged-pion emission from Au + Au collisions at $$\sqrt{s_{\mathrm{NN}}} = 2.4~\hbox {GeV}$$ s NN = 2.4 GeV (corresponding to $$E_{beam} = 1.23~\hbox {A GeV}$$ 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 available world data, but undershoot by $$2.5~\sigma $$ 2.5 σ 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
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2. Proton-number fluctuations in sNN=2.4 GeV Au + Au collisions studied with the High-Acceptance DiElectron Spectrometer (HADES)

Author

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

Subjects
Physics, Proton, Spectrometer, 010308 nuclear & particles physics, Position and momentum space, 01 natural sciences, 7. Clean energy, Nuclear physics, Isospin, Phase space, 0103 physical sciences, Rapidity, Atomic number, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

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

Author

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

Subjects
Physics, Excitation function, Particle physics, 010308 nuclear & particles physics, Branching fraction, Partial wave analysis, Nuclear Theory, Resonance, Coupling (probability), 7. Clean energy, 01 natural sciences, Baryon, Pion, 0103 physical sciences, Production (computer science), Nuclear Experiment, 010306 general physics
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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4. Identical pion intensity interferometry at $\sqrt{s_{\mathrm{NN}}}=2.4~\hbox {GeV}$: HADES collaboration

Author

Christoph Blume, Marek Palka, O. V. Fateev, I. Koenig, S. Harabasz, F. Seck, Ilya Selyuzhenkov, P. Tlusty, P. Strzempek, C. Franco, A. Dybczak, J. C. Berger-Chen, J. Biernat, Tatiana Karavicheva, C. Behnke, C. Wendisch, J. Dreyer, B. W. Kolb, Alexander Belyaev, B. Ramstein, L. Silva, A. Blanco, P. Fonte, S. Spataro, T. Matulewicz, S. Hlavac, Laura Fabbietti, A. Ivashkin, R. Kotte, K. Nowakowski, C. Deveaux, R. Greifenhagen, I. Fröhlich, C. Höhne, M. G. Wiebusch, T. Heinz, A. Sadovsky, O. Svoboda, P. Zumbruch, P. Salabura, H. Tsertos, E. Usenko, L. Chlad, M. Lorenz, Andrey Reshetin, L. Lopes, J. Siebenson, Joachim Stroth, Roman Gernhäuser, E. Epple, S. Maurus, A. Kugler, G. Kornakov, H. Schuldes, R. H. Munzer, D. M. Mihaylov, J. Friese, A. Rost, T. Galatyuk, F. Kornas, F. Scozzi, J. Adamczewski-Musch, E. Schwab, L. Naumann, R. Holzmann, P. Rosier, L. Maier, J. Markert, Krzysztof Piasecki, T. Kunz, S. Ramos, B. Kämpfer, S. Spies, J. A. Garzón, Witold Przygoda, G. Korcyl, R. Lalik, A.P. Ierusalimov, M. Gumberidze, T. Scheib, C. Sturm, T. Hennino, B. Kardan, M. Böhmer, A. Mangiarotti, Sergey V. Morozov, O. Petukhov, Fedor Guber, Oliver Werner Arnold, V. P. Ladygin, Yu.V. Zanevsky, S. P. Chernenko, Volker Metag, J. Michel, J. Wirth, M. B. Golubeva, P. Rodriguez-Ramos, Yu. G. Sobolev, M. Szala, C. Müntz, A. K. Kurilkin, O. Pechenova, J. Pietraszko, P. Filip, K. Lapidus, V. Pechenov, P. Bordalo, D. Wójcik, Y. Parpottas, A. Lebedev, A. Belounnas, A. B. Kurepin, M. Traxler, W. Koenig, H. Ströbele, V. Wagner, T. Mahmoud, P. Sellheim, P. K. Kurilkin, 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
Nuclear and High Energy Physics, dimension: 3, media_common.quotation_subject, interferometer, transverse momentum: low, Extrapolation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, beam: energy, energy dependence, Nuclear physics, Pion, 0103 physical sciences, Perpendicular, correlation function, Eccentricity (behavior), 010306 general physics, Nuclear Experiment, impact parameter, media_common, pi pi, Physics, energy: high, 010308 nuclear & particles physics, Plane (geometry), Transverse plane, Correlation function (statistical mechanics), 2.4 GeV-cms/nucleon, HADES, space-time, Impact parameter
Abstract

High-statistics $$\pi ^-\pi ^-$$π-π- and $$\pi ^+\pi ^+$$π+π+ femtoscopy data are presented for Au + Au collisions at $$\sqrt{s_\mathrm{NN}} = 2.4~\hbox {GeV}$$sNN=2.4GeV, 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 cube root of the number of participants. 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.

Published
2020
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5. Correlated pion-proton pair emission off hot and dense QCD matter

Author

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

Subjects
energy [excited state], Proton, Freezeout, transverse momentum dependence, 01 natural sciences, energy [hadron], Invariant mass, heavy-ion reactions, Nuclear Experiment (nucl-ex), Nuclear Experiment, mass [Delta(1232)], Physics, Baryonic resonances, Heavy-ion reactions, education.field_of_study, fireball, Breit-Wigner, hadron: energy, pi p: correlation, kinetic [energy], ddc, Isospin, Nucleon, Nuclear and High Energy Physics, 2.42 GeV-cms/nucleon, QC1-999, Population, correlation [pi p], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], transverse momentum, Kinetic energy, Nuclear physics, isospin, Pion, 0103 physical sciences, Delta(1232): mass, matter [quantum chromodynamics], ddc:530, 010306 general physics, education, quantum chromodynamics: matter, energy: kinetic, 010308 nuclear & particles physics, background, excited state: energy, rapidity, HADES, freezeout, Energy (signal processing)
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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6. Exploring time like tranistions in pp, πp and AA reactions with HADES

Author

Roman Gernhäuser, A. Kugler, S. Spies, P. Chudoba, Sergey V. Morozov, R. Greifenhagen, Vikram Patel, M. Lorenz, M. B. Golubeva, P. Rodriguez-Ramos, C. Müntz, P. Wintz, Krzysztof Piasecki, J. Stumm, T. Mahmoud, Christoph Blume, T. Galatyuk, B. Kardan, Burkhard Kampfer, B. Ramstein, A. Kozela, J. Dreyer, Alexander Belyaev, A. Prozorov, T. Matulewicz, O. Petukhov, J. Friese, A. Malige, US Singh, D. Dittert, A. Lebedev, A. Rost, G. Kornakov, V. Pechenov, Piotr Salabura, K. H. Kampert, A. Zhilin, S. Maurus, L. Naumann, C. Wendisch, P. Tlusty, M. Gumberidze, F. Scozzi, J. Adamczewski-Musch, F. Seck, C. Höhne, M. G. Wiebusch, A. Belounnas, Fedor Guber, S. Harabasz, M. Traxler, O. Pechenova, A.A. Weber, F. Kornas, Izabela Ciepał, S. Fateev, J. Pietraszko, M. Böhmer, A.P. Ierusalimov, K. Nowakowski, O. Svoboda, W. Koenig, S. Lebedev, Laura Fabbietti, J. Kuboś, Oleg Golosov, P. Kulesa, C. Pauly, S. Borisenko, L. Chlad, N. Rathod, W.A. Esmail, H. Ströbele, L. Ritman, P. Zumbruch, P. Salabura, Andrey Reshetin, V. Wagner, R. Holzmann, A. Blanco, I. Kres, J. Förtsch, P. Fonte, J. Markert, A. Ivashkin, R. Kotte, Gennady Lykasov, V. P. Ladygin, S. Linev, K. Pysz, B. Arnoldi-Meadows, C. Ungethüm, O. Vazquez-Doce, H. Huck, D. Pfeifer, Witold Przygoda, R. Hensch, L. Lopes, Joachim Stroth, J.-H. Otto, I. Shabanov, R. Lalik, I. Fröhlich, I. Selyuzhenkov, I. Koenig, Volker Metag, J. Michel, J. Wirth, M. Szala, Michael Dürr, Jerzy Smyrski, 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
p p: scattering, Photon, heavy ion: scattering, Meson, pi p: scattering, QC1-999, Nuclear Theory, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, dilepton, Nuclear physics, photon: massive, meson: coupling, 0103 physical sciences, transition: electromagnetic, ddc:530, Vector meson, 010306 general physics, Nuclear Experiment, enhancement, QCD matter, quantum chromodynamics: matter, Physics, form factor: transition, 010308 nuclear & particles physics, Scattering, Computer Science::Information Retrieval, High Energy Physics::Phenomenology, vector meson, Baryon, baryon, HADES, Excited state, High Energy Physics::Experiment, Nucleon
Abstract

NSTAR 2019, Bonn, Germany, 10 Jun 2019 - 14 Jun 2019; The European physical journal / Web of Conferences 241, 01013 (2020). doi:10.1051/epjconf/202024101013, Published by EDP Sciences, Les Ulis

Published
2020
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7. Time-like baryon transitions studies with HADES

Author

A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, V. Kushpil, C. Wendisch, A. Lebedev, P. Wintz, L. Silva, S. Morozov, K. Nowakowski, A. Belounnas, A. B. Kurepin, J. Kuboś, Manfred Sobiella, C. Müntz, M. Traxler, C. Deveaux, P. Tlusty, R. Greifenhagen, E. Schwab, Christoph Blume, S. Spataro, Arkadiy Taranenko, V. Mikhaylov, T. Heinz, H. Tsertos, I. Fröhlich, O. Svoboda, M. Liu, A.I. Zinchenko, B. Kardan, F. Kornas, A. Kozela, D. Pfeifer, K. H. Kampert, B. Kämpfer, R. Lalik, O. Petukhov, M. Lorenz, V. Pechenov, B. Włoch, L. Lopes, M. Gumberidze, A.P. Ierusalimov, T. Galatyuk, F. Seck, W. Koenig, C. Pauly, P. K. Kurilkin, Fedor Guber, Joachim Stroth, P. Chudoba, S. Harabasz, C. Franco, L. Naumann, P. Bordalo, Oliver Werner Arnold, M. Zuschke, Laura Fabbietti, R. Holzmann, H. Schuldes, J. Pietraszko, J. Markert, T. Hennino, I. Koenig, Vikram Patel, Andrey Reshetin, D. Dittert, Roman Gernhäuser, G. Kornakov, A. Kugler, Ilya Selyuzhenkov, Grzegorz Korcyl, V. Khomyakov, Y. Parpottas, S. Ramos, D. M. Mihaylov, M. Kajetanowicz, L. Chlad, Anna Carolina Toledo da Cunha Pereira, M. Böhmer, J. Dreyer, Alexander Belyaev, Izabela Ciepał, V. Petousis, S. Spies, A. Rost, V. P. Ladygin, S. Linev, Witold Przygoda, A. Gillitzer, L. Ritman, P. Zumbruch, O. V. Fateev, Victor Ivanov, P. Salabura, A. Zhilin, T. Kunz, H. Ströbele, B. Ramstein, F. Scozzi, M. B. Golubeva, Gennady Lykasov, J. Adamczewski-Musch, P. Rodriguez-Ramos, A. Sadovsky, M. Himmelreich, V. Wagner, C. Höhne, T. Mahmoud, M. G. Wiebusch, J. Friese, P. Sellheim, S. Maurus, P. Strzempek, J. Biernat, J. A. Garzón, Tatiana Karavicheva, A. Troyan, K. Pysz, T. Scheib, B. Arnoldi-Meadows, Volker Metag, J. Michel, J. Wirth, O. Pechenova, M. Szala, Jerzy Smyrski, Alexander Malakhov, 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), HADES, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
p p: scattering, Meson, QC1-999, Nuclear Theory, off-shell, hyperon, 01 natural sciences, Resonance (particle physics), electron: pair production, Nuclear physics, transition: electromagnetic, 0103 physical sciences, Elementary reaction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], talk: Krakow 2018/06/07, ddc:530, structure, pi: beam, Vector meson, Nuclear Experiment, 010306 general physics, Physics, Range (particle radiation), 1-3.5 GeV-cms/nucleon, 010308 nuclear & particles physics, nucleon, Hyperon, matter: effect, vector meson, Darmstadt Lab, Baryon, HADES, kinematics, baryon resonance: production, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, experimental results
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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8. Identical pion intensity interferometry in central Au + Au collisions at 1.23 A GeV

Author

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

Subjects
correlation: two-particle, Nuclear and High Energy Physics, heavy ion: scattering, dimension: 3, Gaussian, interferometer, transverse momentum: low, potential: Coulomb, Extrapolation, pi, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science::Digital Libraries, energy dependence, Nuclear physics, symbols.namesake, Pion, Correlation function, 0103 physical sciences, correlation function: two-particle, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, energy: low, Physics, 010308 nuclear & particles physics, Radius, Hanbury-Brown-Twiss effect, lcsh:QC1-999, Intensity (physics), Interferometry, HADES, symbols, lcsh:Physics, Excitation, experimental results
Abstract

We investigate identical pion HBT intensity interferometry for central Au+Au collisions at 1.23A GeV. High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinal-comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted Coulomb-corrected source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy. Our data would thus rather disfavour any strong energy dependence of the radius parameters in the low energy region., Comment: 7 pages, 5 figures, updated author and grant lists

Published
2019
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9. Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

Author

V. Pechenov, C. Höhne, M. G. Wiebusch, O. Petukhov, T. Heinz, Christoph Blume, M. Lorenz, J. Siebenson, A. Dybczak, V. Petousis, S. Hlavac, E. Schwab, O. V. Fateev, J. C. Berger-Chen, A. Rost, L. Chlad, W. Kühn, B. Ramstein, E. Usenko, A. K. Kurilkin, H. Schuldes, P. Rosier, J. Pietraszko, S. Harabasz, A.P. Ierusalimov, B. Kämpfer, W. Koenig, A. Sadovsky, F. Scozzi, L. Lopes, Marek Palka, J. Adamczewski-Musch, J. A. Garzón, P. Filip, C. Sturm, M. Gumberidze, B. W. Kolb, Fedor Guber, E. Morinière, Yu. G. Sobolev, C. Müntz, C. Wendisch, T. Scheib, I. Koenig, P. Bordalo, T. Galatyuk, A. Lebedev, Oliver Werner Arnold, R. Holzmann, L. Naumann, M. Böhmer, A. Mangiarotti, L. Silva, J. Markert, B. Kardan, L. Maier, A. Belounnas, A. B. Kurepin, A. V. Sarantsev, M. Traxler, S. Ramos, K. Nowakowski, C. Deveaux, V. P. Ladygin, T. Hennino, Roman Gernhäuser, Yu.V. Zanevsky, A. Blanco, P. Fonte, A. Kugler, A. Ivashkin, R. Kotte, P. K. Kurilkin, M. B. Golubeva, P. Rodriguez-Ramos, Sergey V. Morozov, J. Stroth, R. Lalik, T. Liu, O. Svoboda, S. Spataro, I. Fröhlich, G. Kornakov, Andrey Reshetin, C. Franco, R. H. Munzer, D. M. Mihaylov, Grzegorz Korcyl, H. Tsertos, Laura Fabbietti, T. Kunz, P. Tlusty, Kirill Lapidus, Tatiana Karavicheva, C. Behnke, Witold Przygoda, S. P. Chernenko, Volker Metag, Yiannis Parpottas, J. Michel, J. Wirth, O. Pechenova, J. Friese, H. Ströbele, V. Wagner, T. Mahmoud, P. Sellheim, P. Strzempek, E. T. Atomssa, J. Biernat, Paolo Finocchiaro, S. Maurus, F. Seck, Eliane Epple, J. Dreyer, Alexander Belyaev, P. Zumbruch, and P. Salabura

Subjects
Physics, Quark, Particle physics, Proton, 010308 nuclear & particles physics, Branching fraction, Partial wave analysis, Nuclear Theory, Hadron, Kinetic energy, 01 natural sciences, Particle identification, Nuclear physics, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e− and ppe+e−γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+e−γ) and Δ+→pe+e− Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is identified for the first time and the sensitivity to N-Δ transition form factors is tested. The Δ(1232) Dalitz decay branching ratio is also determined for the first time; our result is (4.19 ± 0.62 syst. ± 0.34 stat.) ×10−5, albeit with some model dependence.

Published
2017
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10. Λpinteraction studied via femtoscopy inp+Nbreactions atsNN=3.18GeV

Author

A. Sadovsky, A.P. Ierusalimov, V. Petousis, R. Holzmann, V. P. Ladygin, A. Rost, J. Markert, S. Ramos, G. Kornakov, V. Metag, S. P. Chernenko, Christoph Blume, A. Rustamov, M. Lorenz, J. Michel, W. Koenig, C. Höhne, T. Galatyuk, C. Franco, L. Maier, C. Deveaux, J. Wüstenfeld, O. Svoboda, J. Wirth, Marek Palka, J. Friese, Eliane Epple, T. Scheib, P. K. Kurilkin, S. Spataro, I. Fröhlich, O. V. Fateev, J. Siebenson, Tatiana Karavicheva, C. Behnke, C. Wendisch, L. Silva, S. Harabasz, E. Krebs, Laura Fabbietti, B. W. Kolb, A. Lebedev, E. T. Atomssa, K. Teilab, A. Kugler, M. Traxler, A. Dybczak, J. Stroth, J. C. Berger-Chen, Witold Przygoda, T. Mahmoud, S. Hlavac, F.F. Guber, T. Hennino, A. Krása, M. Böhmer, A. Blanco, P. Fonte, A. Mangiarotti, P. Sellheim, A. Ivashkin, R. Kotte, K. Schmidt-Sommerfeld, I. Koenig, J. A. Garzón, C. Sturm, M. Jurkovic, J. Adamczewski-Musch, K. Gill, G. Korcyl, H. Ströbele, H. Kuc, R. Lalik, A. Tarantola, L. Lopes, L. Naumann, H. Schuldes, T. A. Vasiliev, B. Kämpfer, P. Strzempek, V. Wagner, J. Biernat, B. Ramstein, M. Gumberidze, B. Kardan, G. Agakishiev, Yiannis Parpottas, S. Maurus, Alexey Kurepin, Oliver Werner Arnold, P. Zumbruch, P. Salabura, V. Pechenov, O. Pechenova, J. Pietraszko, H. Tsertos, Yu. G. Sobolev, P. Tlusty, Kirill Lapidus, C. Müntz, T. Kunz, L. Rehnisch, M.B. Golubeva, Yu.V. Zanevsky, Andrey Reshetin, R. H. Munzer, P. Bordalo, and A. K. Kurilkin

Subjects
Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2016
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