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Barucca, Gianni ; Davì, F. ; Lancioni, G. ; Mengucci, P. ; Montalto, L. ; Natali, P. P. ; Paone, N. ; Rinaldi, D. ; Scalise, L. ; Erni, W. ; Krusche, B. ; Steinacher, M. ; Walford, N. ; Cao, N. ; Liu, Z. ; Liu, C. ; Liu, B. ; Shen, X. ; Sun, S. ; Tao, J. ; Xiong, X. A. ; Zhao, G. ; Zhao, J. ; Albrecht, Malte ; Alkakhi, W. ; Bökelmann, S. ; Coen, S. ; Feldbauer, Florian ; Fink, M. ; Frech, J. ; Freudenreich, V. ; Fritsch, Miriam ; Grochowski, J. ; Hagdorn, R. ; Heinsius, Fritz-Herbert ; Held, T. ; Holtmann, Tobias ; Keshk, Iman ; Koch, H. ; Kopf, Bertram ; Kuhlmann, M. ; Kümmel, M. ; Küßner, M. ; Li, J. ; Linzen, L. ; Maldaner, Stephan ; Oppotsch, J. ; Pankonin, S. ; Pelizäus, Marc ; Pflüger, S. ; Pitka, A. ; Reher, J. ; Reicherz, G. ; Schnier, Claudius ; Steinke, M. ; Triffterer, T. ; Wenzel, C. ; Wiedner, Ulrich ; Denizli, H. ; Er, N. ; Keskin, U. ; Olgun, A. T. ; Yerlikaya, S. ; Yilmaz, A. ; Beck, R. ; Hammann, C. ; Hartmann, J. ; Ketzer, Bernhard ; Müllers, J. ; Rossbach, M. ; Salisbury, B. ; Schmidt, Christian Joachim ; Thoma, U. ; Urban, M. ; Bianconi, A. ; Bragadireanu, Mario ; Pantea, D. ; Domagala, M. ; Filo, G. ; Lisowski, E. ; Lisowski, F. ; Michałek, M. ; Poznański, P. ; Płażek, J. ; Korcyl, K. ; Kozela, A. ; Lebiedowicz, P. ; Pysz, K. ; Schäfer, W. ; Szczurek, A. ; Firlej, M. ; Fiutowski, T. ; Idzik, M. ; Moron, J. ; Swientek, K. ; Terlecki, P. ; Korcyl, G. ; Lalik, R. ; Malige, A. ; Moskal, P. ; Nowakowski, K. ; Przygoda, W. ; Rathod, N. ; Rudy, Z. ; Salabura, P. ; Smyrski, J. ; Augustin, I. ; Böhm, R. ; Lehmann, I. ; Schmitt, L. ; Varentsov, V. ; Al-Turany, Mohammad ; Belias, A. ; Deppe, H. ; Dzhygadlo, R. ; Flemming, H. ; Gerhardt, A. ; Götzen, Klaus ; Heinz, Andreas ; Jiang, P. ; Karabowicz, R. ; Koch, S. ; Kurilla, U. ; Lehmann, D. ; Lühning, J. ; Lynen, U. ; Orth, H. ; Peters, Klaus ; Saito, T. ; Schepers, G. ; Schmidt, C. J. ; Schwarz, C. ; Schwiening, J. ; Täschner, Alexander ; Traxler, M. ; Voss, B. ; Wieczorek, P. ; Abazov, V. ; Alexeev, G. ; Arefiev, V. A. ; Astakhov, V. ; Barabanov, M. Yu. ; Batyunya, B. V. ; Dodokhov, V. Kh. ; Efremov, A. ; Fechtchenko, A. ; Galoyan, A. ; Golovanov, G. ; Koshurnikov, E. K. ; Lobanov, Y. Yu. ; Olshevskiy, A. G. ; Piskun, A. A. ; Samartsev, A. ; Shimanski, S. ; Skachkov, N. B. ; Skachkova, A. N. ; Strokovsky, E. A. ; Tokmenin, V. ; Uzhinsky, V. ; Verkheev, A. ; Vodopianov, A. ; Zhuravlev, N. I. ; Branford, D. ; Watts, D. ; Böhm, M. ; Eyrich, W. ; Lehmann, A. ; Miehling, D. ; Pfaffinger, M. ; Quin, N. ; Robison, L. ; Seth, K. ; Xiao, T. ; Bettoni, Diego ; Ali, A. ; Hamdi, A. ; Himmelreich, Mathilde ; Krebs, M. ; Nakhoul, S. ; Nerling, Frank ; Belousov, A. ; Kisel, Ivan ; Kozlov, Grigory ; Pugach, M. ; Zyzak, Maksym ; Bianchi, Nicola ; Gianotti, Paola ; Lucherini, V. ; Bracco, G. ; Bettner, Y. ; Bodenschatz, S. ; Brinkmann, K. T. ; Brück, L. ; Diehl, S. ; Dormenev, V. ; Düren, M. ; Erlen, T. ; Föhl, K. ; Hahn, C. ; Hayrapetyan, A. ; Hofmann, J. ; Kegel, S. ; Kesselkaul, M. ; Köseoglu, I. ; Kripko, A. ; Kühn, Wolfgang ; Lange, Jens Sören ; Metag, V. ; Moritz, M. ; Nanova, M. ; Novotny, R. ; Orsich, P. ; Pereira-de-Lira, J. ; Peter, M. ; Sachs, M. ; Schmidt, M. ; Schubert, R. ; Stenzel, H. ; Straube, M. ; Strickert, M. ; Thöring, U. ; Wasem, T. ; Wohlfahrt, B. ; Zaunick, H. G. ; Tomasi-Gustafsson, E. ; Glazier, D. ; Ireland, D. ; Seitz, B. ; Deepak, P. N. ; Kulkarni, A. ; Kappert, R. ; Kavatsyuk, Myroslav O. ; Loehner, H. ; Messchendorp, Johannes Gerhardus ; Rodin, Viktor ; Schakel, P. ; Vejdani, S. ; Dutta, K. ; Kalita, K. ; Huang, G. ; Liu, D. ; Peng, H. ; Qi, H. ; Sun, Y. ; Zhou, X. ; Kunze, M. ; Azizi, K. ; Tavukoglu, Z. ; Derichs, A. ; Dosdall, R. ; Esmail, W. ; Gillitzer, A. ; Goldenbaum, F. ; Grunwald, D. ; Jokhovets, L. ; Kannika, J. ; Kulessa, P. ; Orfanitski, S. ; Pérez Andrade, G. ; Prasuhn, D. ; Prencipe, E. ; Pütz, J. ; Ritman, J. ; Rosenthal, E. ; Schadmand, S. ; Schmitz, R. ; Scholl, A. ; Sefzick, T. ; Serdyuk, V. ; Stockmanns, T. ; Veretennikov, D. ; Wintz, P. ; Wüstner, P. ; Xu, H. ; Zhou, Y. ; Cao, X. ; Hu, Q. ; Li, Z. ; Li, H. ; Liang, Y. ; Ma, X. ; Rigato, V. ; Isaksson, L. ; Achenbach, P. ; Corell, O. ; Denig, Achim ; Distler, M. ; Hoek, M. ; Lauth, W. ; Leithoff, H. H. ; Liu, Z. ; Merkel, H. ; Müller, U. ; Pochodzalla, J. ; Schlimme, S. ; Sfienti, C. ; Thiel, M. ; Zambrana, M. ; Ahmed, Samer ; Bleser, S. ; Bölting, M. ; Capozza, L. ; Dbeyssi, A. ; Ehret, A. ; Klasen, R. ; Kliemt, Ralf ; Maas, F. ; Motzko, C. ; Noll, O. ; Piñeiro, D. Rodríguez ; Schupp, F. ; Steinen, M. ; Wolff, S. ; Zimmermann, I. ; Fedorov, A. ; Kazlou, D. ; Korzhik, M. ; Missevitch, O. ; Balanutsa, P. ; Chernetsky, V. ; Demekhin, A. ; Dolgolenko, A. ; Fedorets, P. ; Gerasimov, A. ; Golubev, A. ; Goryachev, V. ; Kantsyrev, Alexey V. ; Kirin, D. Y. ; Kristi, N. ; Ladygina, E. ; Luschevskaya, E. ; Matveev, V. A. ; Panjushkin, V. ; Stavinskiy, A. V. ; Balashoff, A. ; Boukharov, A. ; Malyshev, O. ; Basant, K. N. ; Kumawat, H. ; Roy, B. ; Saxena, Alok ; Yogesh, S. ; Bonaventura, D. ; Brand, P. ; Fritzsch, C. ; Grieser, S. ; Hargens, C. ; Hergemöller, A. K. ; Hetz, B. ; Hüsken, Nils ; Kellers, J. ; Khoukaz, Alfons ; Mannweiler, C. ; Vestrick, S. ; Bumrungkoh, D. ; Herold, Christoph ; Khosonthongkee, K. ; Kobdaj, Chinorat ; Limphirat, A. ; Manasatitpong, K. ; Nasawad, T. ; Pongampai, S. ; Simantathammakul, T. ; Srisawad, P. ; Wongprachanukul, N. ; Yan, Y. ; Yu, C. ; Zhang, X. ; Zhu, W. ; Blinov, A. E. ; Kononov, S. ; Kravchenko, E. A. ; Antokhin, E. ; Barnyakov, A. Yu. ; Beloborodov, K. ; Blinov, V. E. ; Kuyanov, I. A. ; Pivovarov, S. ; Pyata, E. ; Tikhonov, Y. ; Hunter, G. ; Lattery, M. ; Pace, H. ; Boca, Gianluigi ; Duda, D. ; Finger, M. ; Finger, M. ; Kveton, A. ; Pesek, M. ; Peskova, M. ; Prochazka, I. ; Slunecka, M. ; Volf, M. ; Gallus, P. ; Jary, V. ; Korchak, O. ; Marcisovsky, M. ; Neue, G. ; Novy, J. ; Tomasek, L. ; Tomasek, M. ; Virius, M. ; Vrba, V. ; Abramov, V. ; Bukreeva, S. ; Chernichenko, S. ; Derevschikov, A. ; Ferapontov, V. ; Goncharenko, Y. ; Levin, A. ; Maslova, E. ; Melnik, Y. ; Meščanin, Aleksei P. ; Minaev, N. ; Mochalov, V. ; Moiseev, V. ; Morozov, D. ; Nogach, L. ; Poslavskiy, S. ; Ryazantsev, A. ; Ryzhikov, S. ; Semenov, P. ; Shein, I. ; Uzunian, A. ; Vasiliev, Andrey ; Yakutin, A. ; Roy, U. ; Yabsley, B. ; Belostotski, S. ; Fedotov, G. ; Gavrilov, G. ; Izotov, A. ; Manaenkov, S. ; Miklukho, O. ; Zhdanov, A. ; Atac, A. ; Bäck, T. ; Cederwall, B. ; Makonyi, K. ; Preston, M. ; Tegner, P. E. ; Wölbing, D. ; Gandhi, K. ; Rai, A. K. ; Godre, S. ; Crede, V. ; Dobbs, S. ; Eugenio, P. ; Lersch, D. ; Calvo, D. ; De Remigis, P. ; Filippi, A. ; Mazza, G. ; Rivetti, Angelo ; Wheadon, R. ; Bussa, M. P. ; Spataro, Stefano ; Iazzi, F. ; Lavagno, A. ; Martin, A. ; Akram, A. ; Calen, H. ; Ikegami Andersson, Walter ; Johansson, Tord ; Kupsc, Andrzej ; Marciniewski, P. ; Papenbrock, Michael ; Regina, J. ; Rieger, J. ; Schönning, K. ; Wolke, M. ; Pothodi Chackara, V. ; Chlopik, A. ; Kesik, G. ; Melnychuk, D. ; Tarasiuk, J. ; Wojciechowski, M. ; Wronka, S. ; Zwieglinski, B. ; Amsler, C. ; Bühler, Paul ; Marton, J. ; Nalti, W. ; Steinschaden, D. ; Widmann, Eberhard ; Zimmermann, S. ; Zmeskal, Johann
This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, |GE | and |GM|, using the ¯pp → μ+μ− reaction at PANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at PANDA, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is ¯pp → π+π−,due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distribuations of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, Jörn ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Matulewicz, Tomasz ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, K. ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Piasecki, Krzysztof ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, Sérgio ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Wójcik, Daniel Krzysztof ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We investigate identical pion HBT intensity interferometry in central Au+Au collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinally 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 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.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, A. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, J. ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, W. ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kühn, Wolfgang ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Lourenco Vaz Gil ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, K.N. ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, S. ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, L. ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.16 and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K− transverse-mass spectra can be explained solely by feed-down, which substantially softens the spectra of K− mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze-out temperatures of K+ and K− mesons caused by different couplings to baryons.
Adamczewski-Musch, Jörn ; Arnold, Oliver ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexander ; Berger-Chen, Jia-Chii ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey ; Chlad, Lukáš ; Ciepał, Izabela ; Deveaux, Christina Anna ; Dreyer, Jörn ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Torsten ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kohls, Marvin ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kornas, Frédéric Julian ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexei ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexander ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Malige, Akshay ; Mangiarotti, Alessio ; Markert, Jochen ; Matulewicz, Tomasz ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, Krzysztof ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Piasecki, Krzysztof ; Pietraszko, Jerzy ; Przygoda, Witold ; Pysz, Krzysztof ; Ramos, Sérgio ; Ramstein, Béatrice ; Rathod, Narendra ; Reshetin, Andrey ; Rodríguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Singh, U. ; Smyrski, Jerzy ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Sturm, Christian ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Wójcik, Daniel Krzysztof ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at sNN=2.42 GeV collected with HADES. In this energy regime the population of Δ(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/dMπ±pdpTdy distributions of correlated π±p pairs have been determined by subtracting the πp combinatorial background using an iterative method. The invariant-mass distributions in the Δ(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 π+p and π−p pairs, and to follow a power law 〈Apart〉α, where 〈Apart〉 is the mean number of participating nucleons. The exponent α depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is α=1.5±0.08st±0.2sy.
Adamczewski-Musch, Jörn ; Agakishiev, Geydar ; Arnold, Oliver Werner ; Atomssa, Ermias T. ; Behnke, Claudia ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Deveaux, Christina Anna ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Gill, Katharina ; Golubeva, Marina ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, W. ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Kuc, Hubert ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Maurus, Steffen ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petousis, Vlasios ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, S. ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rost, Adrian ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schmidt-Sommerfeld, Korbinian ; Schuldes, Heidi ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, L. ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, C. ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Wendisch, Christian ; Wirth, Joana ; Wüstenfeld, Jörn ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
The production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to sNN=3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Σ0s were identified via the decay Σ0→Λγ with subsequent decays Λ→pπ− in coincidence with a e+e− pair from either external (γ→e+e−) or internal (Dalitz decay γ⁎→e+e−) gamma conversions. The differential Σ0 cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5<y<1.1, has been extracted as ΔσΣ0=2.3±(0.2)stat±(−0.6+0.6)sys±(0.2)norm mb, yielding the inclusive production cross section in full phase space σΣ0total=5.8±(0.5)stat±(−1.4+1.4)sys±(0.6)norm±(1.7)extrapol mb by averaging over different extrapolation methods. The Λall/Σ0 ratio within the HADES acceptance is equal to 2.3±(0.2)stat±(−0.6+0.6)sys. The obtained rapidity and momentum distributions are compared to transport model calculations. The Σ0 yield agrees with the statistical model of particle production in nuclear reactions. Keywords: Hyperons, Strangeness, Proton, Nucleus.
Kurilkin, Aleksey K. ; Arnold, Oliver ; Atomssa, Ermias T. ; Behnke, Claudia ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey ; Deveaux, Christina Anna ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gill, Katharina ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Krizek, Filip ; Kuc, Hubert ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexei ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lang, Simon Martin ; Lapidus, Kirill ; Lebedev, Alexander ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Pechenov, Vladimir ; Pechenova, Olga ; Petousis, Vlasios ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rost, Adrian ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schmidt-Sommerfeld, Korbinian ; Schuldes, Heidi ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Wendisch, Christian ; Wirth, Joana ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V.
We present the results of two-pion production in tagged quasi-free np collisions at a deutron incident beam energy of 1.25 GeV/c measured with the High-Acceptance Di-Electron Spectrometer (HADES) installed at GSI. The specific acceptance of HADES allowed for the first time to obtain high-precision data on π+π− and π−π0 production in np collisions in a region corresponding to large transverse momenta of the secondary particles. The obtained differential cross section data provide strong constraints on the production mechanisms and on the various baryon resonance contributions (∆∆, N(1440), N(1520), ∆(1600)). The invariant mass and angular distributions from the np → npπ+π −and np → ppπ−π0 reactions are compared with different theoretical model predictions.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, Jörg ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, Krzysztof ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, Sérgio ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Zanevsky, Yuri V. ; Zumbruch, Peter W. ; Leifels, Yvonne
We present first data on sub-threshold production of Ks0 mesons and Λ hyperons in Au+Au collisions at sNN=2.4 GeV. We observe an universal 〈Apart〉 scaling of hadrons containing strangeness, independent of their corresponding production thresholds. Comparing the yields, their 〈Apart〉 scaling, and the shapes of the rapidity and the pt spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none of them can simultaneously describe these observables with reasonable χ2 values.
Przygoda, Witold ; Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Atomssa, Ermias T. ; Behnke, Claudia ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Deveaux, Christina Anna ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gill, Katharina ; Golubeva, Marina ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Kuc, Hubert ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petousis, Vlasios ; Pietraszko, Jerzy ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rost, Adrian ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schmidt-Sommerfeld, Korbinian ; Schuldes, Heidi ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Wendisch, Christian ; Wirth, Joana ; Wüstenfeld, Jörn ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
n this paper we report on the investigation of baryonic resonance production in proton-proton collisions at the kinetic energies of 1.25 GeV and 3.5 GeV, based on data measured with HADES. Exclusive channels npπ+ and ppπ0 as well as ppe+e− were studied simultaneously in the framework of a one-boson exchange model. The resonance cross sections were determined from the one-pion channels for Δ(1232) and N(1440) (1.25 GeV) as well as further Δ and N* resonances up to 2 GeV/c2 for the 3.5 GeV data. The data at 1.25 GeV energy were also analysed within the framework of the partial wave analysis together with the set of several other measurements at lower energies. The obtained solutions provided the evolution of resonance production with the beam energy, showing a sizeable non-resonant contribution but with still dominating contribution of Δ(1232)P33. In the case of 3.5 GeV data, the study of the ppe+e− channel gave the insight on the Dalitz decays of the baryon resonances and, in particular, on the electromagnetic transition form-factors in the time-like region. We show that the assumption of a constant electromagnetic transition form-factors leads to underestimation of the yield in the dielectron invariant mass spectrum below the vector mesons pole. On the other hand, a comparison with various transport models shows the important role of intermediate ρ production, though with a large model dependency. The exclusive channels analysis done by the HADES collaboration provides new stringent restrictions on the parameterizations used in the models.
Pietraszko, Jerzy ; Agakishiev, Geydar ; Behnke, Claudia ; Belver, Daniel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Cabanelas Eiras, Pablo ; Chernenko, Sergey P. ; Dritsa, Christina ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gill, Katharina ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Höhne, Claudia ; Holzmann, Romain ; Huck, Patrick ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Krizek, Filip ; Kuc, Hubert ; Kugler, Andrej ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lang, Simon Martin ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Przygoda, Witold ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Siebenson, Johannes Stephan ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Weber, Michael ; Wendisch, Christian ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V.
Many QCD based and phenomenological models predict changes of hadron properties in a strongly interacting environment. The results of these models differ significantly and the experimental determination of hadron properties in nuclear matter is essential. In this paper we present a review of selected physics results obtained at GSI Helmholtzzentrum für Schwerionenforschung GmbH by HADES (High-Acceptance Di-Electron Spectrometer). The e+e− pair emission measured for proton and heavy-ion induced collisions is reported together with results on strangeness production. The future HADES activities at the planned FAIR facility are also discussed.
Lorenz, Manuel ; Agakishiev, Geydar ; Behnke, Claudia ; Belver, Daniel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Cabanelas Eiras, Pablo ; Dritsa, Christina ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fonte, Paulo ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gill, Katharina ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Holzmann, Romain ; Huck, Patrick ; Höhne, Claudia ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Krizek, Filip ; Kuc, Hubert ; Kugler, Andrej ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lang, Simon Martin ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Siebenson, Johannes Stephan ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Weber, Michael ; Wendisch, Christian ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V.
The knowledge of baryonic resonance properties and production cross sections plays an important role for the extraction and understanding of medium modifications of mesons in hot and/or dense nuclear matter. We present and discuss systematics on dielectron and strangeness production obtained with HADES on p+p, p+A and A+A collisions in the few GeV energy regime with respect to these resonances.