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1. Technical supplement to 'Polarization transfer observables in elastic electron-proton scattering at Q2=2.5,5.2,6.8 and 8.5GeV2'

Author

H. C. Fenker, Michael Kohl, S. Nedev, P. Carter, S. Covrig, Rolf Ent, A. Shahinyan, Joerg Reinhold, S. Dhamija, Y. Prok, X. Zhang, Bi-Tao Hu, L. Bimbot, H. Baghdasaryan, P. E. Reimer, V. Kravtsov, Salvatore Frullani, William Bertozzi, W. Luo, Franco Garibaldi, S. Širca, Lubomir Pentchev, G. M. Huber, Nuruzzaman, A. Mkrtchyan, L. Solovyev, R. Subedi, David Hamilton, Yu.V. Zanevsky, V. Mamyan, Z. Ye, D. J. Margaziotis, Y. Zhang, M. H. Shabestari, Bogdan Wojtsekhowski, C. F. Perdrisat, G. J. Kumbartzki, Ronald Ransome, M. Khandaker, G. Mbianda, H. Mkrtchyan, J. C. Cornejo, M. E. Christy, P. Bosted, A. Ahmidouch, Y. Goncharenko, C. E. Keppel, I. Sitnik, D. S. Razin, Dipangkar Dutta, V. A. Punjabi, Donal Day, Andrey Vasiliev, A. Marsh, D. G. Meekins, Emil Frlez, E. Piasetzky, W. U. Boeglin, A. Asaturyan, J. Arrington, J. Mulholland, I. Albayrak, L. Zhu, O. Moreno, P. Solvignon, K. Hafidi, O. Rondon, S. Danagoulian, B. Moffit, P. M. King, W. Hinton, M. Meziane, S. A. Wood, M. Veilleux, J. Huang, G. R. Smith, E. Tomasi-Gustafsson, Shalev Gilad, K. A. Aniol, Y. Li, T. Horn, L. Smykov, S. P. Chernenko, C. Butuceanu, James A. Miller, Amrendra Narayan, D. Gaskell, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, James Maxwell, W. Pierce, Fatiha Benmokhtar, X. Zheng, Andrew Puckett, Y. Matulenko, Ronald Gilman, F. R. Wesselmann, Andrei Afanasev, A. Davidenko, Di. Kirillov, Yu.M. Mel'nik, A. Daniel, E. J. Brash, and K. Shestermanov

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Elastic electron, Observable, Technical note, Polarization (waves), 01 natural sciences, Nuclear physics, Electromagnetic calorimeter, Proton scattering, 0103 physical sciences, Born approximation, 010306 general physics, Instrumentation, Mathematical physics
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J; Rondon, O | Abstract: The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q2=2.5,5.2,6.8, and 8.54 GeV 2. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μpGEp∕GMp at large values of Q2 and to search for effects beyond the Born approximation in polarization transfer observables at Q2=2.5GeV2. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Published
2018

2. Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons inAu+AuCollisions atsNN=2.4 GeV

Author

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

Subjects
Physics, Equation of state, Spectrometer, Nuclear Theory, Elliptic flow, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Baryon, Nuclear physics, Deuterium, Flow (mathematics), Harmonics, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics
Abstract

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

3. 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

4. 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

5. 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

6. 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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7. Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter

Author

Grzegorz Korcyl, S. P. Chernenko, V. Metag, L. Chlad, T. Hennino, O. V. Fateev, J. A. Garzón, J. Michel, T. Mahmoud, D. Dittert, L. Silva, A. Blanco, P. Fonte, P. Chudoba, M. Lorenz, Yu.V. Zanevsky, V. P. Ladygin, A. Ivashkin, J. Dreyer, Alexander Belyaev, R. Kotte, A. Prozorov, K. Nowakowski, S. Spataro, S. Linev, P. Sellheim, V. Pechenov, J. Wirth, T. Kunz, T. Heinz, T. Galatyuk, H. Tsertos, P. Zumbruch, P. Rodriguez-Ramos, J. Kuboś, C. Behnke, P. Salabura, A. Rost, S. Harabasz, H. Schuldes, I. Fröhlich, M.B. Golubeva, A. K. Kurilkin, M. Szala, Sergey V. Morozov, P. Tlusty, Kirill Lapidus, O. Vazquez Doce, T. Scheib, V. Mikhaylov, Christoph Blume, H. Ströbele, Izabela Ciepał, L. Maier, O. Pechenova, A. Malige, B. Kämpfer, V. Wagner, W. Koenig, F. Seck, L. Lopes, Andrey Reshetin, Yiannis Parpottas, J. Pietraszko, C. Ungethüm, S. Maurus, Oliver Werner Arnold, Eliane Epple, M. Gumberidze, C. Höhne, M. G. Wiebusch, C. Wendisch, R. H. Munzer, D. M. Mihaylov, Roman Gernhäuser, Alexey Kurepin, A. Kugler, E. T. Atomssa, Jerzy Smyrski, B. Ramstein, S. Spies, J. Siebenson, E. Schwab, B. Kardan, Laura Fabbietti, C. Müntz, O. Petukhov, A. Sadovsky, P. Strzempek, J. Biernat, R. Holzmann, N. Rathod, J. Stroth, J. Markert, A.P. Ierusalimov, P. K. Kurilkin, R. Lalik, A. Lebedev, F. Kornas, A. Belounnas, M. Traxler, F.F. Guber, M. Böhmer, Catalina Curceanu, B. W. Kolb, F. Scozzi, J. Adamczewski-Musch, Alessandro Scordo, I. Koenig, J. C. Berger-Chen, G. Kornakov, C. Franco, C. Deveaux, R. Greifenhagen, O. Svoboda, K. Schmidt-Sommerfeld, J. Friese, Witold Przygoda, K. Piscicchia, L. Naumann, D. Wójcik, C. Sturm, 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
Meson, Hadron, FOS: Physical sciences, General Physics and Astronomy, Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], meson, 01 natural sciences, Nuclear physics, Momentum, strangeness, K-: absorption, 0103 physical sciences, strong coupling, Nuclear Experiment (nucl-ex), 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment, Physics, nucleus, hadron: absorption, Coupling (probability), Nuclear matter, Neutron star, Automatic Keywords, HADES, nuclear matter, beam: momentum, Elementary Particles and Fields, acceptance
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
2019

8. Readout system of TPC/MPD NICA project

Author

F. Levchanovskiy, S. Razin, A. A. Rybakov, S. A. Movchan, A. V. Averyanov, A. Bajajin, A. M. Korotkova, O. V. Fateev, J. Lukstins, V. Zruyev, S.A. Zaporozhets, S. Vereschagin, G.A. Cheremukhina, V. F. Chepurnov, and Yu.V. Zanevsky

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Integrated circuit, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Data acquisition, Signal-to-noise ratio, Application-specific integrated circuit, law, 0103 physical sciences, 010306 general physics, business, Zero suppression, Data transmission
Abstract

The time-projection chamber (TPC) is the main tracking detector in the MPD/NICA. The information on charge-particle tracks in the TPC is registered by the MWPG with cathode pad readout. The frontend electronics (FEE) are developed with use of modern technologies such as application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), and data transfer to a concentrator via a fast optical interface. The main parameters of the FEE are as follows: total number of channels, ~95 000; data stream from the whole TPC, 5 GB/s; low power consumption, less than 100 mW/ch; signal to noise ratio (S/N), 30; equivalent noise charge (ENC)

Published
2015

9. MPD TPC status

Author

S. P. Chernenko, Yu. Kiriushin, S.A. Zaporozhets, V. F. Chepurnov, A. Bazhazhin, V. Samsonov, G.A. Cheremukhina, V.V. Chepurnov, J. Lukstins, S. Razin, O. V. Fateev, S. Vereschagin, Yu.V. Zanevsky, V. Zruyev, F. Levchanovskiy, A. Ribakov, A. Pilyar, A. V. Averyanov, S. A. Movchan, and A. M. Korotkova

Subjects
Physics, Wire chamber, Nuclotron, Luminosity (scattering theory), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 01 natural sciences, Particle detector, Linear particle accelerator, Particle identification, 030218 nuclear medicine & medical imaging, law.invention, Nuclear physics, 03 medical and health sciences, 0302 clinical medicine, law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, Collider, Instrumentation, Mathematical Physics
Abstract

In the frame of the JINR scientific program on study of hot and dense baryonic matter a new accelerator complex Ion Collider fAcility (NICA) based on the Nuclotron-M is under realization. Two interaction points are foreseen at NICA for two detectors. One of these detectors, the Multi-Purpose Detector (MPD), is optimized for investigations of heavy-ion collisionsat a luminosity up to 1027 cm−2 s−1 for ions up to Au79+. The Time-Projection Chamber (TPC) is the main tracking detector of the MPD central barrel. It is a well-known detector for 3-dimensional tracking and particle identification for high multiplicity events. The conceptual layout of MPD, TPC design and it's parameters, the current status of the readout based on multiwire proportional chamber (MWPC) and readout electronics based on SAMPA chip as well as the status of TPC subsystems are presented.

Published
2020

10. Erratum: Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5GeV2 [Phys. Rev. C 96 , 055203 (2017)]

Author

James A. Miller, D. J. Margaziotis, M. H. Shabestari, E. Tomasi-Gustafsson, V. Mamyan, S. Dhamija, James Maxwell, Y. Goncharenko, A. Shahinyan, M. Commisso, C. E. Keppel, A. J. R. Puckett, Dipanwita Dutta, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, O. Rondon, J. Arrington, Bogdan Wojtsekhowski, X. Zheng, Emil Frlez, S. A. Wood, M. Veilleux, W.U. Boeglin, P. E. Reimer, S. Frullani, W. Luo, H. C. Fenker, William Bertozzi, Di. Kirillov, A. Mkrtchyan, L. Bimbot, Fatiha Benmokhtar, I. Albayrak, O. Moreno, E. J. Brash, H. Baghdasaryan, A. Daniel, Michael Kohl, S. Nedev, P. Carter, S. Covrig, D. S. Razin, W. Hinton, I. Sitnik, Z. Ye, David Hamilton, L. Y. Zhu, Y. Zhang, Rolf Ent, Tanja Horn, K. Shestermanov, L. Solovyev, J. Mulholland, M. Khandaker, C. F. Perdrisat, Ronald Ransome, Eric L. N. Jensen, V. A. Punjabi, D. G. Meekins, E. Piasetzky, A. Davidenko, A. Asaturyan, Y. Prok, Yu.M. Mel'nik, X. Zhang, Bi-Tao Hu, P. E. Bosted, J. Huang, K. Hafidi, W. Pierce, J. Reinhold, F. R. Wesselmann, Geoffrey Smith, P. Solvignon, H. Mkrtchyan, Y. Li, G. J. Kumbartzki, M. E. Christy, Yu.V. Zanevsky, G. Mbianda, Donal Day, Y. Matulenko, Nuruzzaman, Ronald Gilman, Andrei Afanasev, S. Danagoulian, S. P. Chernenko, C. Butuceanu, Amrendra Narayan, D. Gaskell, P. M. King, J. C. Cornejo, V. Kravtsov, A. Ahmidouch, Simon Širca, G. M. Huber, F. Garibaldi, M. Meziane, Lubomir Pentchev, R. Subedi, Shalev Gilad, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, and L. Smykov

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Multiplicative function, Estimator, Observable, Statistical fluctuations, Polarization (waves), 01 natural sciences, Weighting, 0103 physical sciences, 010306 general physics, Typographical error, Statistical hypothesis testing
Abstract

Subsequent to the release of our original paper, we discovered in the context of preparing our technical supplement [1] for journal publication that a typographical error had existed in the text file that the analysis program used to construct the beam polarization "database" for both the original analysis, published in Ref. [2], and our final analysis. The electron-beam polarization P e and the analyzing power A y cancel exactly in the ratio R , which is proportional to the ratio P t / P l of the transferred polarization components. On the other hand, the extraction of the relative e dependence of P l / P Born l relies on knowledge of the beam polarization. As such, data taking was interrupted roughly every two days during the GEp - 2 ? experiment to perform invasive measurements of the beam polarization using the Hall C Moller polarimeter [3]. The run range affected by the typographical error was entirely contained within the data collected at Q 2 = 2.5 GeV 2 with a beam energy of E e = 3.680 GeV during January 2008. The data from this configuration were combined with the data collected at E e = 3.548 GeV due to the nearly complete overlap of these two settings in terms of Q 2 and e acceptance. It is worth remarking that this typographical error went unnoticed for so long because it only affected a small fraction of the data (less than half of the combined data for ? e ? = 0.790 ) and the difference between the actually assigned beam polarization and the polarization that should have been assigned was comparable in magnitude to the point-to-point systematic uncertainty of the measurement itself. As such, its effect did not show up in various diagnostic plots and statistical tests, such as the time stability of the extracted P l / P Born l ratio. The data for both E e = 3.548 and E e = 3.680 GeV were reprocessed using the corrected beam polarizations to determine the effect of the typographical error on the combined physics results at ? e ? = 0.790 . Because the value of P e cancels in the ratio R , changes in the assumed beam polarization can only affect the results for R via statistical fluctuations due to changes in the relative weighting of different run ranges in the unbinned maximum-likelihood estimators for R . These effects are negligible on the scale of both the statistical and the systematic uncertainties of the data. More noticeable changes are expected in the ratio P l / P Born l since the extracted value of P l is inversely proportional to the assumed value of P e . Table I shows the effect of the corrected beam polarization database on the polarization transfer observables for the combined data for the ? e ? = 0.790 setting, the only measurement affected by the typographical error. The analyzing power did not need to be recalibrated since it was determined using the ? e ? = 0.153 data, which were not affected by the typographical error. As expected, the change in the ratio R is negligible. The value of P Born l , which is computed event by event from the global fit described in the Appendix of the original paper and does not depend on P e , is also unchanged. The magnitudes of P t , P l , and P l / P Born l are reduced by a common multiplicative factor, reflecting the fact that the beam polarization had been underestimated for the run range affected by the typographical error. The most important result of the corrected analysis is that the ratio P l / P Born l has decreased by 0.0024 from 1.0167 to 1.0143, a change comparable in magnitude to the statistical uncertainty but small compared to the total and point-to-point systematic uncertainties. The P l / P Born l result for the original publication [2] would be reduced by the same multiplicative factor as the final result. The physics conclusions of both publications are not materially changed by this correction. (Table Presented). (Figure Presented).

Published
2018

11. Study of the quasi-freenp→npπ+π−reaction with a deuterium beam at 1.25 GeV/nucleon

Author

S. Spataro, I. Fröhlich, J. Wüstenfeld, D. González-Díaz, J. S. Díaz, R. Holzmann, M. Böhmer, J. Markert, P. Cabanelas, A. Mangiarotti, Laura Fabbietti, P. Tlusty, B. Kämpfer, Kirill Lapidus, E. Schwab, A.P. Ierusalimov, T. Christ, A. Rustamov, V. P. Ladygin, A. Dybczak, Kathrin Göbel, Y. Parpottas, M. Gumberidze, Alexander Belyaev, T. Hennino, C. Sturm, T. Liu, S. Lang, A. Gil, J. L. Boyard, L. Lopes, Joachim Stroth, R. Krücken, Andrey Reshetin, A. K. Kurilkin, S. Yurevich, Y. C. Pachmayer, B. Michalska, A. B. Kurepin, M. Traxler, E. Morinière, I. Koenig, B. Ramstein, T. A. Vasiliev, O. V. Fateev, Tatiana Karavicheva, M. Lorenz, A. Schmah, W. Koenig, G. Agakishiev, Jehad Mousa, S. P. Chernenko, D. Belver, Volker Metag, P. Zhou, J. Michel, Paolo Finocchiaro, I. Iori, Witold Przygoda, O. Pechenova, H. Ströbele, A. Tarantola, Piotr Salabura, L. Naumann, L. Maier, V. Wagner, Yu.V. Zanevsky, J. Friese, T. Wojcik, F. Dohrmann, Wolfgang Kuhn, Fedor Guber, E. Castro, M. B. Golubeva, B. Spruck, C. Gilardi, A. Blanco, A. Balanda, P. Fonte, A. Ivashkin, R. Kotte, J. A. Garzón, V. Pechenov, Tetyana Galatyuk, R. Trebacz, J. S. Lange, Michael Weber, Roman Gernhäuser, A. Kugler, J. Pietraszko, M. Jurkovic, D. Kirschner, M. Destefanis, Yu. G. Sobolev, C. Müntz, A. Sadovsky, K. Teilab, Marek Palka, M. Wisniowski, H. Tsertos, Peter Braun-Munzinger, B. W. Kolb, J. Otwinowski, P. K. Kurilkin, and Filip Krizek

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Nuclear Theory, Resonance (particle physics), Nuclear physics, Deuterium, Isospin, Mass spectrum, Invariant mass, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The tagged quasi-free np→npπ+π- reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25 GeV/nucleon (s~2.42 GeV/c for the quasi-free collision). For the first time, differential distributions of solid statistics for π+π- production in np collisions have been collected in the region corresponding to the large transverse momenta of the secondary particles. The invariant mass and angular distributions for the np→npπ+π- reaction are compared with different models. This comparison confirms the dominance of the t-channel with δδ contribution. It also validates the changes previously introduced in the Valencia model to describe two-pion production data in other isospin channels, although some deviations are observed, especially for the π+π- invariant mass spectrum. The extracted total cross section is also in much better agreement with this model. Our new measurement puts useful constraints for the existence of the conjectured dibaryon resonance at mass M~2.38 GeV and with width Γ~70 MeV.

Published
2015

12. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5 GeV2

Author

L. Smykov, Bogdan Wojtsekhowski, H. Mkrtchyan, L. Bimbot, H. C. Fenker, V. Kravtsov, James A. Miller, H. Baghdasaryan, K. Shestermanov, W. Hinton, Y. Matulenko, D. J. Margaziotis, Y. Li, M. H. Shabestari, S. Danagoulian, James Maxwell, Ronald Gilman, M. Commisso, E. Tomasi-Gustafsson, C. E. Keppel, X. Zheng, W. Pierce, X. Zhang, I. Albayrak, A. Asaturyan, Simon Širca, G. M. Huber, F. Garibaldi, A. Davidenko, Andrei Afanasev, Emil Frlez, G. Mbianda, S. Dhamija, J. Mulholland, O. Moreno, B. Moffit, S. Covrig, Yu.M. Mel'nik, Y. Goncharenko, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, J. Huang, Di. Kirillov, L. Solovyev, S. A. Wood, M. Veilleux, P. E. Reimer, Fatiha Benmokhtar, A. Daniel, Donal Day, Andrew Puckett, S. Frullani, William Bertozzi, Michael Kohl, S. Nedev, P. Carter, B. S. Hu, F. R. Wesselmann, S. P. Chernenko, E. J. Brash, V. A. Punjabi, David Hamilton, D. S. Razin, Y. Prok, M. Khandaker, C. Butuceanu, Amrendra Narayan, D. Gaskell, I. Sitnik, Nuruzzaman, W. Luo, Dipangkar Dutta, J. Arrington, Yu.V. Zanevsky, V. Mamyan, Rolf Ent, R. Subedi, Y. Zhang, Andrey Vasiliev, A. Marsh, A. Shahinyan, P. M. King, Joerg Reinhold, J. C. Cornejo, Shalev Gilad, Ronald Ransome, Lubomir Pentchev, K. A. Aniol, C. F. Perdrisat, D. G. Meekins, Z. Ye, W. U. Boeglin, L. Zhu, O. Rondon, M. Meziane, G. J. Kumbartzki, M. E. Christy, P. Bosted, P. Solvignon, G. R. Smith, A. Ahmidouch, E. Piasetzky, K. Hafidi, A. Mkrtchyan, and T. Horn

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Scattering, Electron, Polarization (waves), 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, Born approximation, 010306 general physics, Nucleon
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Commisso, M; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J | Abstract: Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GEp/GMp of the proton's electric and magnetic form factors for momentum transfers Q21 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of GEp/GMp to the highest practically achievable Q2 given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic ∫ - p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic ∫ - p→∫ - scattering were measured at central Q2 values of 2.5, 5.2, 6.8, and 8.54 GeV2. At Q2=2.5GeV2, data were obtained for central values of the virtual photon polarization parameter ϵ of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ϵ=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q2 of GEp/GMp continues to Q2=8.5GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q2=8.5GeV2, GEp/GMp remains positive but is consistent with zero. At Q2=2.5GeV2, GEp/GMp derived from the polarization component ratio R-Pt/P shows no statistically significant ϵ dependence, as expected in the Born approximation. On the other hand, the ratio P""/P""Born of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ϵ=0.783 relative to ϵ=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels in the ratio R.

Published
2017

13. 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

14. pK+Λ final state: Towards the extraction of the ppK− contribution

Author

J. Wüstenfeld, C. Sturm, B. Ramstein, T. Hennino, Alexander Belyaev, B. Kämpfer, Tetyana Galatyuk, L. Lopes, M. Gumberidze, P. Cabanelas, Joachim Stroth, P. Huck, H. Schuldes, P. Tlusty, Kirill Lapidus, J. Friese, A. Sadovsky, K. Teilab, P. K. Kurilkin, J. Siebenson, G. Kornakov, W. Koenig, Y. Parpottas, R. Holzmann, J. Markert, A.P. Ierusalimov, A. Dybczak, D. Belver, J. C. Berger-Chen, T. A. Vasiliev, V. P. Ladygin, Yu.V. Zanevsky, R. Lalik, S. Lang, D. González-Díaz, C. Höhne, A. Krása, Tatiana Karavicheva, C. Behnke, S. P. Chernenko, A. Lebedev, Volker Metag, S. Spataro, I. Fröhlich, I. Koenig, J. Michel, M. B. Golubeva, Andrey Reshetin, A. B. Kurepin, A. Rustamov, H. Ströbele, M. Traxler, Marek Palka, M. Lorenz, Piotr Salabura, L. Naumann, O. V. Fateev, R. H. Munzer, O. Svoboda, A. K. Kurilkin, V. Wagner, L. Maier, B. W. Kolb, S. Harabasz, O. Pechenova, Laura Fabbietti, Fedor Guber, P. Strzempek, K. Gill, H. Kuc, L. Rehnisch, Grzegorz Korcyl, H. Tsertos, Michael Weber, Witold Przygoda, G. Agakishiev, E. Epple, S. Yurevich, A. Tarantola, E. Krebs, M. Böhmer, A. Mangiarotti, Yu. G. Sobolev, C. Müntz, A. Kugler, M. Jurkovic, J. A. Garzón, J. Pietraszko, V. Pechenov, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, Christoph Blume, T. Scheib, C. Wendisch, Filip Krizek, and C. Dritsa

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Hyperon, Lambda baryon, 01 natural sciences, Resonance (particle physics), 0103 physical sciences, Bound state, 010306 general physics, Nucleon
Abstract

The reaction p ( @ 3.5 GeV ) + p → p + Λ + K + can be studied to search for the existence of kaonic bound states like p p K − leading to this final state. This effort has been motivated by the assumption that in p + p collisions the Λ ( 1405 ) resonance can act as a doorway to the formation of the kaonic bound states. The status of this analysis within the HADES Collaboration, with particular emphasis on the comparison to simulations, is shown in this work and the deviation method utilized by the DISTO Collaboration in a similar analysis is discussed. The outcome suggests the employment of a partial wave analysis do disentangle the different contributions to the measured p K + Λ final state.

Published
2013

15. 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

16. Production of in reactions at 3.5 GeV beam energy

Author

J. Otwinowski, P. Tlusty, Kirill Lapidus, A. Dybczak, J. C. Berger-Chen, A. Krása, Burkhard Kampfer, B. Spruck, A. M. Schmah, E. Schwab, S. Lang, A.P. Ierusalimov, T. Christ, A. Rustamov, I. Iori, B. Michalska, Michael Weber, Tatiana Karavicheva, T. Hennino, H. Kuc, B. W. Kolb, R. Holzmann, J. Markert, H. Ströbele, S. Yurevich, A. Tarantola, I. Koenig, C. Wendisch, Filip Krizek, V. Pechenov, Laura Fabbietti, V. Wagner, Y. C. Pachmayer, M. Gumberidze, M. Böhmer, A. Mangiarotti, S. P. Chernenko, Tetyana Galatyuk, J. S. Lange, A. Sadovsky, Andrey Reshetin, M. Lorenz, Volker Metag, Witold Przygoda, J. Michel, G. Agakishiev, W. Kühn, Marek Palka, Yu. G. Sobolev, R. H. Munzer, Fedor Guber, O. V. Fateev, C. Müntz, Y. Parpottas, Paolo Finocchiaro, O. Pechenova, K. Teilab, M. Destefanis, J. Friese, Yu.V. Zanevsky, D. González-Díaz, J. Pietraszko, D. Belver, T. Heinz, M. B. Golubeva, A. Balanda, C. Gilardi, Roman Gernhäuser, A. Kugler, A. Blanco, J. A. Garzón, M. Jurkovic, W. Koenig, L. Naumann, R. Trebacz, L. Maier, P. Fonte, K. Kanaki, A. Ivashkin, Jehad Mousa, R. Kotte, E. Castro, P. Salabura, Alexander Belyaev, F. Dohrmann, Eliane Epple, A. B. Kurepin, C. Sturm, B. Ramstein, J. Wüstenfeld, P. Cabanelas, J. Siebenson, J. L. Boyard, L. Lopes, Joachim Stroth, R. Krücken, E. Morinière, S. Spataro, I. Fröhlich, M. Traxler, R. Lalik, T. Liu, and H. Tsertos

Subjects
Physics, Nuclear and High Energy Physics, Angular distribution, 010308 nuclear & particles physics, 0103 physical sciences, Resonance, Production (computer science), Atomic physics, 010306 general physics, Kinetic energy, 01 natural sciences, Beam energy
Abstract

We study the production of Σ ± π ∓ p K + particle quartets in p + p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report evaluates the contribution of resonances like Λ ( 1405 ) , Σ ( 1385 ) 0 , Λ ( 1520 ) , Δ ( 1232 ) , N ⁎ and K ⁎ 0 to the Σ ± π ∓ p K + final state. The resulting simulation model is compared to the experimental data in several angular distributions and it shows itself as suitable to evaluate the acceptance corrections properly.

Published
2012

17. Strange baryon resonances in pp collisions measured with HADES

Author

O. V. Fateev, I. Koenig, A. Kozuch, T. Hennino, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, A. Sadovsky, H. Kuc, Witold Przygoda, L. Naumann, V. Metag, K. Teilab, A.P. Ierusalimov, V. P. Ladygin, A. Dybczak, M. Lorenz, A. Krása, B. Michalska, R. Holzmann, Yvonne Chiara Pachmayer, Alexander Belyaev, A. Rustamov, J. Markert, M.B. Golubeva, W. Koenig, P. Tlusty, Grzegorz Korcyl, H. Ströbele, H. Tsertos, J. Friese, S. P. Chernenko, P. Cabanelas, Yu. G. Sobolev, F.F. Guber, P. Huck, Kirill Lapidus, G. Kornakov, Marek Palka, J. Michel, S. Spataro, I. Fröhlich, M. Böhmer, T. A. Vasiliev, V. Wagner, A. Kugler, A. Mangiarotti, C. Sturm, P. Salabura, A. M. Schmah, J. Siebenson, J. Wüstenfeld, B. Kämpfer, B. W. Kolb, C. Müntz, S. Lang, S. Yurevich, L. Lopes, M. Gumberidze, M. Traxler, Andrey Reshetin, R. Krücken, Yiannis Parpottas, G. Agakishiev, E. Epple, Alexey Kurepin, D. González-Díaz, Paolo Finocchiaro, A. Tarantola, J. A. Garzón, B. Ramstein, O. Pechenova, J. Stroth, M. Jurkovic, J. Pietraszko, Tatiana Karavicheva, Laura Fabbietti, T. Liu, Yu.V. Zanevsky, R. Trebacz, V. Pechenov, A. K. Kurilkin, Marc Weber, T. Galatyuk, L. Maier, W. Kühn, D. Belver, Filip Krizek, and P. K. Kurilkin

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Hyperon, Physical and Theoretical Chemistry, Condensed Matter Physics, Kinetic energy, Beam energy, Atomic and Molecular Physics, and Optics
Abstract

We present an analysis of the hyperons Λ(1405) and Σ(1385) + for p+p reactions at 3.5 GeV kinetic beam energy. The data were taken with the High Acceptance Di-Electron Spectrometer (HADES). A Λ(1405) signal could be reconstructed in both charged decay channels Λ(1405)→Σ± π ∓ . The obtained statistics of the Σ(1385) + signal allows also differential studies.

Published
2011

18. The MPD detector at the NICA heavy-ion collider at JINR

Author

O.M. Listratenko, K. I. Davkov, E.I. Litvinenko, P. Polozov, V.M. Slepnev, V. Peresedov, A. Raportirenko, I. A. Tyapkin, M. Protsenko, Kyrill A. Bugaev, F.F. Guber, N. Gorbunov, L.V. Kravchuck, I.A. Polenkevich, V.S. Alfeev, M. Merkin, I.N. Goncharov, Vitaly Pronskikh, Sergei Afanasiev, V.N. Zrjuev, V. I. Davkov, A. Ivashkin, V. I. Kolesnikov, V.M. Lucenko, I. Tymchuk, L. I. Sarycheva, V. Jejer, E. E. Boos, I. Geshkov, N. Krahotin, M.S. Prokudin, A. Guskov, V. B. Dunin, V.A. Babkin, V. M. Lysan, Hamlet Khodzhibagiyan, O.P. Gavrischuk, S.V. Sergeev, M. Kadykov, D. Madigozhin, V.M. Golovatyuk, Vladimir Borisov, S.P. Lobastov, M.B. Golubeva, O.A. Denisovskaia, David Blaschke, Z. Sadygov, Liudmila Malinina, V. I. Yurevich, A.V. Shabunov, S. Razin, A.G. Litvinenko, Grigory Trubnikov, Andrey Reshetin, S. P. Chernenko, V. D. Toneev, L. G. Efimov, A.A. Savenkov, K. Mikhailov, E. Egorov, D.E. Donetz, Nikolai Shumeiko, B.G. Shchinov, Viktor Matveev, I. Stamenov, D. Drnojan, V. F. Chepurnov, N. Anfimov, S.V. Volgin, Gennady Zinovjev, V. Zherebchevskiy, Alexander Sorin, D.N. Bogoslovsky, Oleg Teryaev, V. Mialkovski, B. Grinyov, A. Stavinskiy, Konstantin K. Gudima, Yu.V. Zanevsky, Igor Meshkov, O. Rogachevsky, Tatiana Karavicheva, V.V. Chalyshev, A. V. Friesen, S.N. Igolkin, I. Slepnev, Anatoly Sidorin, S. Ya. Sychkov, I.V. Boguslavski, V.V. Tichomirov, I.E. Chirikov-Zorin, Vladimir Kekelidze, V. Lazarev, N.M. Vladimirova, I.I. Migulina, V. A. Nikitin, Alexander Malakhov, T.M. Solovjeva, N. A. Molokanova, Yu.I. Fedotov, G.J. Musulmanbekov, G. Sharkov, J. Lukstins, D.A. Bliznyuk, Vladimir Peshekhonov, A. Yukaev, A.I. Zinchenko, F. Zazulia, S.N. Bazylev, Vl.F. Chepurnov, P. Zhmurin, D. A. Arkhipkin, G. A. Feofilov, Yu. Potrebenikov, Alexey Kurepin, S. Petrushanko, D.K. Dryablov, V.N. Borshchov, A. N. Sissakian, Andrey Butenko, R.Ya. Zul'karneev, Vladimir Korotkikh, Alexander Snigirev, Yu. Murin, Alexander Kovalenko, Yu.T. Kiryushin, G. D. Kekelidze, G.A. Cheremukhina, S. A. Movchan, A. G. Olshevski, V.I. Voskoboinik, N.A. Kuz’min, D.D. Emelyanov, Yu.R. Zulkarneeva, P. Zh. Aslanyan, Kh.U. Abraamyan, S.S. Tolstoukhov, M. I. Baznat, R. Lednitsky, A. A. Voronin, Viatcheslav Stolin, A.O. Kechechyan, Alla Maevskaya, Igor Lokhtin, A. Sadovsky, Yu. A. Gornushkin, Z. Krumshtein, D.V. Peshekhonov, A. Yu. Isupov, and O. V. Fateev

Subjects
Physics, Nuclear and High Energy Physics, Nuclotron, Particle physics, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking system, Tracking (particle physics), Particle identification, law.invention, Nuclear physics, Electromagnetic calorimeter, law, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, business, Collider, Instrumentation
Abstract

The MultiPurpose Detector (MPD) is designed to study heavy-ion collisions at the Nuclotron-based heavy Ion Collider fAcility (NICA) at JINR, Dubna. Its main components located inside a superconducting solenoid are a tracking system composed of a silicon microstrip vertex detector followed by a large volume time-projection chamber, a time-of-flight system for particle identification and a barrel electromagnetic calorimeter. A zero degree hadron calorimeter is designed specifically to measure the energy of spectators. In this paper, all parts of the apparatus are described and their tracking and particle identification (PID) parameters are discussed in some detail.

Published
2011

19. Study of dielectron production in C+C collisions at 1A GeV

Author

M. Roy-Stephan, R.S. Simon, P. Tlusty, Laura Fabbietti, J. S. Lange, E. Schwab, Tetyana Galatyuk, O. Pechenova, J. Pietraszko, A. B. Kurepin, M. Traxler, Filip Krizek, C. Sturm, A.P. Ierusalimov, A. M. Schmah, M. Weber, A. Gil, S. Spataro, R. Holzmann, J. Markert, E. Morinière, Y. Parpottas, Yu. G. Sobolev, D. Mishra, C. Müntz, H. Wen, Alexander Belyaev, D. González-Díaz, J. S. Díaz, Y. C. Pachmayer, S. Lang, Tatiana Karavicheva, Thomas Eberl, K. Lapidus, T. Christ, A. Dybczak, R. Novotny, Jehad Mousa, B. Michalska, P. Cabanelas, J. Lamas-Valverde, H. Alvarez-Pol, A. Rustamov, A. Krása, Andrey Reshetin, D. Belver, T. Perez Cavalcanti, Witold Przygoda, I. Koenig, A. Kozuch, A. Kugler, M. Sudol, T. Heinz, B. Spruck, R. Pleskac, P. Zhou, T. Hennino, C. Gilardi, Yu.V. Zanevsky, J. L. Boyard, M. Destefanis, A. Blanco, P. Fonte, V. Pospíšil, F. Dohrmann, A. Ivashkin, Paolo Finocchiaro, R. Kotte, A. Toia, A. Bortolotti, M. B. Golubeva, A. Balanda, S. Yurevich, J. Friese, T. Wojcik, Piotr Salabura, L. Lopes, L. Maier, V. Pechenov, Joachim Stroth, R. Krücken, E. Grosse, J. A. Garzón, I. Iori, B. Kämpfer, H. Ströbele, V. Wagner, B. W. Kolb, J. Otwinowski, B. Ramstein, B. Sailer, R. Trebacz, J. Marín, Kalliopi Kanaki, M. Münch, D. Kirschner, C. Schroeder, P. Zumbruch, E. Castro, O. V. Fateev, C. Agodi, R. Bassini, M. Heilmann, Roman Gernhäuser, M. Kajetanowicz, M. Jurkovic, Wolfgang Kuhn, H. Tsertos, Peter Braun-Munzinger, G. Bellia, I. Veretenkin, Fedor Guber, I. Fröhlich, A. Tarantola, M. Böhmer, A. Mangiarotti, S. P. Chernenko, Volker Metag, J. Wüstenfeld, G. Agakishiev, W. Koenig, L. Naumann, A. Sadovsky, K. Teilab, Marek Palka, and M. Wisniowski

Subjects
Excitation function, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Incident energy, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The emission of e+ e- pairs from C + C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the π0-Dalitz to the ρ / ω invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment. © 2008 Elsevier B.V. All rights reserved.

Published
2008

20. K*(892)+production in proton-proton collisions atEbeam=3.5GeV

Author

Filip Krizek, V. Metag, M. Lorenz, F.F. Guber, P. Tlusty, R. Holzmann, J. Markert, Kirill Lapidus, M. Böhmer, A. Mangiarotti, P. Cabanelas, B. W. Kolb, T. Hennino, J. L. Boyard, A. Lebedev, V. Pechenov, O. Svoboda, A. M. Schmah, S. P. Chernenko, J. Michel, Kathrin Göbel, J. Siebenson, E. Schwab, J. Friese, J. Wüstenfeld, Roman Gernhäuser, G. Kornakov, A. Sadovsky, A. Blanco, T. A. Vasiliev, M. Traxler, A. Kugler, P. Fonte, A. Ivashkin, A.P. Ierusalimov, H. Tsertos, R. Kotte, T. Kunz, A. Dybczak, V. P. Ladygin, B. Kämpfer, Oliver Werner Arnold, J. C. Berger-Chen, W. Kühn, H. Kuc, O. Pechenova, L. Naumann, M.B. Golubeva, H. Ströbele, M. Weber, O. V. Fateev, J. A. Garzón, A. Krása, A. Rustamov, Andrey Reshetin, C. Wendisch, Yu.V. Zanevsky, M. Gumberidze, M. Jurkovic, D. Belver, J. Pietraszko, V. Wagner, R. H. Munzer, D. M. Mihaylov, I. Koenig, S. Yurevich, Yiannis Parpottas, Yu. G. Sobolev, Alexey Kurepin, D. González-Díaz, L. Maier, C. Müntz, W. Koenig, C. Sturm, Witold Przygoda, T. Heinz, A. Tarantola, S. Spataro, I. Fröhlich, J. Stroth, G. Korcyl, R. Lalik, L. Lopes, R. Krücken, G. Agakishiev, Paolo Finocchiaro, Tatiana Karavicheva, P. Salabura, Laura Fabbietti, B. Spruck, I. Iori, Tetyana Galatyuk, Eliane Epple, Alexander Belyaev, Marek Palka, K. Teilab, Yvonne Chiara Pachmayer, and B. Ramstein

Subjects
Physics, Excitation function, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, 7. Clean energy, 01 natural sciences, Resonance (particle physics), Spectral line, Nuclear physics, Cross section (physics), Excited state, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Spin-½
Abstract

We present results on the K∗(892)+ production in proton-proton collisions at a beam energy of E=3.5 GeV, which is hitherto the lowest energy at which this mesonic resonance has been observed in nucleon-nucleon reactions. The data are interpreted within a two-channel model that includes the three-body production of K∗(892)+ associated with the Λ or Σ hyperon. The relative contributions of both channels are estimated. Besides the total cross section σ(p+p→K∗(892)++X)=9.5±0.9-0.9+1.1±0.7μb, which adds a new data point to the excitation function of the K∗(892)+ production in the region of low excess energy, transverse momenta and angular spectra are extracted and compared with the predictions of the two-channel model. The spin characteristics of K∗(892)+ are discussed as well in terms of the spin-alignment.

Published
2015

21. SubthresholdΞ−Production in Collisions ofp(3.5 GeV)+Nb

Author

S. P. Chernenko, Volker Metag, T. Heinz, J. Michel, O. Pechenova, J. Pietraszko, Laura Fabbietti, Yu.V. Zanevsky, D. González-Díaz, M. B. Golubeva, A. Balanda, Piotr Salabura, L. Naumann, P. Tlusty, Y. Parpottas, C. Wendisch, Kirill Lapidus, C. Müntz, A. Tarantola, L. Maier, Filip Krizek, B. Spruck, Eliane Epple, R. Müntzer, Yu. G. Sobolev, T. Hennino, H. Tsertos, A. M. Schmah, S. Yurevich, Y. C. Pachmayer, Kathrin Göbel, A. Lebedev, W. Kühn, G. Kornakov, P. Cabanelas, J. Stroth, B. Ramstein, Witold Przygoda, S. Lang, I. Koenig, V. Pechenov, D. Belver, Andrey Reshetin, M. Lorenz, H. Kuc, Tatiana Karavicheva, A. B. Kurepin, M. Traxler, Alexander Belyaev, T. A. Vasiliev, B. W. Kolb, J. Friese, O. V. Fateev, Tetyana Galatyuk, J. Siebenson, M. Böhmer, A. Mangiarotti, C. Sturm, W. Koenig, E. Schwab, A.P. Ierusalimov, B. Kämpfer, A. Rustamov, J. Wüstenfeld, R. Lalik, T. Liu, J. L. Boyard, L. Lopes, M. Gumberidze, Roman Gernhäuser, R. Krücken, R. Holzmann, J. Markert, G. Agakishiev, Paolo Finocchiaro, A. Kugler, V. P. Ladygin, B. Michalska, S. Spataro, I. Fröhlich, A. Dybczak, J. C. Berger-Chen, A. Krása, J. A. Garzón, A. Blanco, P. Fonte, M. Jurkovic, A. Ivashkin, R. Kotte, Fedor Guber, Oliver Werner Arnold, Michael Weber, R. Trebacz, I. Iori, H. Ströbele, V. Wagner, K. Teilab, Marek Palka, and A. Sadovsky

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Subthreshold conduction, Hyperon, General Physics and Astronomy, Heavy ion, 7. Clean energy, Beam energy
Abstract

Results on the production of the double strange cascade hyperon Ξ^{-} are reported for collisions of p(3.5 GeV)+Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Ξ^{-} production is observed in proton-nucleus interactions. Assuming a Ξ^{-} phase-space distribution similar to that of Λ hyperons, the production probability amounts to P_{Ξ^{-}}=[2.0±0.4(stat)±0.3(norm)±0.6(syst)]×10^{-4} resulting in a Ξ^{-}/(Λ+Σ^{0}) ratio of P_{Ξ^{-}}/P_{Λ+Σ^{0}}=[1.2±0.3(stat)±0.4(syst)]×10^{-2}. Available model predictions are significantly lower than the measured Ξ^{-} yield.

Published
2015

22. Electron/pion identification with ALICE TRD prototypes using a neural network algorithm

Author

Ken Oyama, Johanna Stachel, M. R. Stockmeier, N. Heine, C. Lippmann, A. Radu, H. Daues, W. Ludolphs, V. I. Yurevich, L. Smykov, T. Lehmann, O. Zaudtke, M. Inuzuka, Hideki Hamagaki, O. Busch, R. Santo, C. Adler, R.S. Simon, A. Sandoval, B. Vulpescu, D. Emschermann, W. Verhoeven, T. Mahmoud, Anton Andronic, A. Wilk, D. Bucher, Taku Gunji, I. Rusanov, Christoph Blume, Mihai Petrovici, G. Tsiledakis, Bernd Stefan Windelband, H. K. Soltveit, S. P. Chernenko, V. Angelov, Yu.V. Zanevsky, H. Appelshäuser, Rainer Martin Schicker, Y. Foka, Klaus Johannes Reygers, H. Gottschlag, Volker Lindenstruth, R. Glasow, D. Miskowiec, V. Catanescu, E. Kislov, N. Herrmann, O. V. Fateev, Peter Braun-Munzinger, C. Garabatos, Yu. Panebratsev, M. Ciobanu, A. Marin, H. Stelzer, V. Petracek, J. Hehner, Johannes Peter Wessels, and C. Baumann

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Artificial neural network, Physics::Instrumentation and Detectors, Nuclear Theory, Electron, Nuclear physics, Transition radiation detector, Identification (information), Pion, High Energy Physics::Experiment, Nuclear Experiment, Alice (programming language), Instrumentation, computer, computer.programming_language
Abstract

We study the electron/pion identification performance of the ALICE Transition Radiation Detector (TRD) prototypes using a neural network (NN) algorithm. Measurements were carried out for particle momenta from 2 to 6 GeV/c. An improvement in pion rejection by about a factor of 3 is obtained with NN compared to standard likelihood methods.

Published
2005

23. Di-electron measurements in C+C reactions at with HADES

Author

M. Jaskula, Y. C. Pachmayer, R. Holzmann, J. Markert, L.M. Pant, J. A. Garzón, C. Maiolino, Tatiana Karavicheva, V. T. Smolyankin, B. Ramstein, I. Iori, I. Fröhlich, J. Mousa, James Ritman, Jaroslav Bielcik, Joachim Stroth, R. Krücken, Roman Gernhäuser, M. Jurkovic, Paolo Finocchiaro, J. L. Boyard, O. V. Fateev, C. Agodi, F. Dohrmann, Piotr Salabura, B. Kämpfer, R. Novotny, Yu.V. Zanevsky, H. Alvarez-Pol, R. Djeridi, T. Pérez, G. Agakishiev, Piera Sapienza, S. Hlavac, A.P. Ierusalimov, R. Pleskac, Laura Fabbietti, M. Münch, G. Bellia, J. Novotný, Wolfgang Kuhn, R.S. Simon, M. Sánchez, I. Koenig, A. Toia, T. Christ, A. Rustamov, F. Guber, M. Wiśniowski, A. Sadovsky, P. Tlustý, V. Pospíšil, C. Sturm, S. P. Chernenko, Volker Metag, M. Roy-Stephan, M. B. Golubeva, N. Rabin, P. Zumbruch, T. Hennino, A. B. Kurepin, R. Kulessa, M. Böhmer, D. González-Díaz, A. Kugler, R. Coniglione, A. Balanda, R. Kotte, M. Traxler, B. Sailer, J. Kotulic-Bunta, V. Wagner, M. Sudol, J. Wüstenfeld, E. Grosse, B. W. Kolb, J. Otwinowski, Kalliopi Kanaki, Thomas Eberl, H. Tsertos, Peter Braun-Munzinger, W. Koenig, L. Naumann, V. Pechenov, H. Stroebele, C. Müntz, L. Smykov, I. Duran, J. Pietraszko, A. M. Schmah, S. Spataro, S. Lang, Andrey Reshetin, B. Spruck, J. Lehnert, J. Friese, T. Wojcik, D. Žovinec, and Witold Przygoda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, 010308 nuclear & particles physics, Hadron, Detector, Electron, Invariant (physics), Nuclear matter, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Analysis method
Abstract

The High Acceptance DiElectron Spectrometer HADES has been recently commissioned at GSI, Darmstadt. It has been designed for systematic studies of hadron properties inside nuclear matter. We report first preliminary results on invariant masses e + e - -pairs which were measured in 12 C + 12 C collisions at E kin = 2 GeV ⋅ A . The analysis methods are briefly outlined and a comparison with detailed Monte-Carlo simulations is shown.

Published
2005

24. Position reconstruction in drift chambers operated with Xe, (15%)

Author

L. Smykov, D. Emschermann, R. Santo, V. Petracek, Christoph Blume, O. V. Fateev, R.S. Simon, H. K. Soltveit, S. Radomski, Taku Gunji, Christian Lippmann, Johanna Stachel, V. I. Yurevich, C. Adler, Oliver Busch, T. Mahmoud, Anton Andronic, Rainer Martin Schicker, C. Garabatos, H. Appelshäuser, D. Bucher, Johannes Peter Wessels, M. Inuzuka, Panagiota Foka, B. Vulpescu, H. Stelzer, H. Daues, E. Kislov, M. Ivanov, Volker Lindenstruth, N. Herrmann, G. Tsiledakis, Andres Sandoval, I. Rusanov, Mihai Petrovici, Bernd Stefan Windelband, J. Bielcikova, O. Zaudtke, Yu.V. Zanevsky, Kilian Eberhard Schwarz, V. Caˇtaˇnescu, W. Ludolphs, Peter Braun-Munzinger, and M. Ciobanu

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Monte Carlo method, Electron drift, Computational physics, Nuclear physics, Transition radiation detector, Transition radiation, Position (vector), Perpendicular, Angular resolution, Absorption (electromagnetic radiation), Instrumentation
Abstract

We present measurements of position and angular resolution of drift chambers operated with a Xe, CO 2 (15%) mixture. The results are compared to Monte Carlo simulations and important systematic effects—in particular the dispersive nature of the absorption of transition radiation and non-linearities—are discussed. The measurements were carried out with prototype drift chambers of the ALICE Transition Radiation Detector, but our findings can be generalized to other drift chambers with similar geometry, where the electron drift is perpendicular to the wire planes.

Published
2005

25. Energy loss of pions and electrons of 1– in drift chambers operated with Xe,CO2(15%)

Author

O. V. Fateev, V. Cătănescu, R. Santo, L. Smykov, V. I. Yurevich, B. Vulpescu, H. Stelzer, D. Emschermann, G. Tsiledakis, V. Petracek, T. Mahmoud, Anton Andronic, W. Ludolphs, Taku Gunji, Volker Lindenstruth, M. Inuzuka, H. Appelshäuser, R.S. Simon, Johanna Stachel, Oliver Busch, Christoph Blume, H. K. Soltveit, C. Xu, Johannes Peter Wessels, H. Daues, E. Kislov, O. Zaudtke, N. Herrmann, C. Garabatos, D. Bucher, Rainer Martin Schicker, Peter Braun-Munzinger, Andres Sandoval, M. Ciobanu, Y. Foka, Yu.V. Zanevsky, I. Rusanov, Mihai Petrovici, and Bernd Stefan Windelband

Subjects
Physics, Nuclear and High Energy Physics, Energy loss, Physics::Instrumentation and Detectors, Detector, Electron, Nuclear physics, Transition radiation detector, Pion, Transition radiation, Particle, Atomic physics, Nuclear Experiment, Instrumentation, Fermi Gamma-ray Space Telescope
Abstract

We present measurements of the energy loss of pions and electrons in drift chambers (DC) operated with a Xe,CO 2(15%) mixture. The measurements are carried out for particle momenta from 1 to 6 GeV /c using prototype DC for the ALICE transition radiation detectors. Microscopic calculations are performed using input parameters calculated with GEANT3. These calculations reproduce well the measured average and most probable values for pions, but a higher Fermi plateau is required in order to reproduce our electron data. The widths of the measured distributions are smaller for data compared to the calculations. The electron/pion identification performance using the energy loss is also presented.

Published
2004

26. Development of low-mass drift chambers for the HADES spectrometer

Author

A Petrov, Yu.V. Zanevsky, Joachim Stroth, Manfred Sobiella, L. Smykov, W. Koenig, F. Dohrmann, P Zumbruch, S. P. Chernenko, J Kempter, O. V. Fateev, J. Wüstenfeld, E. Grosse, J. Pouthas, H. Daues, Wolfgang Enghardt, P. Rosier, C. Garabatos, J L Boyard, L. Naumann, C. Müntz, L. Glonti, H. Bokemeyer, H. Stelzer, V. F. Chepurnov, J. Hehner, T. Hennino, Institut de Physique Nucléaire d'Orsay (IPNO), 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
Physics, Nuclear and High Energy Physics, Particle physics, Toroid, Meson, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 7. Clean energy, 01 natural sciences, Charged particle, Particle detector, Nuclear physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Instrumentation, Event (particle physics), Beam (structure)
Abstract

The High Acceptance Di-Electron Spectrometer (HADES) is a detector arrangement combined with a superconducting toroid for lepton pair spectroscopy presently built up at GSI (Darmstadt). HADES is designed to cope with the high-multiplicity environment of heavy ion collisions at 1AGeV and intensities of up to 108 beam particles per second and central event rates of 105 s-1. The detector has a geometrical acceptance of almost 50% for e+e- pairs and a mass resolution of 0.8% for ρ and ω mesons. Four low-mass drift chamber systems, two before and two behind the magnet, serve for charged particle track reconstruction. Design aspects of the drift chambers and first results from beam tests are presented.

Published
2002

27. TPC status for MPD experiment of NICA project

Author

S.A. Zaporozhets, G.A. Cheremukhina, A. M. Korotkova, A. Pilyar, S. Vereschagin, A. V. Averyanov, Yu. Kiriushin, O. V. Fateev, V. Samsonov, A. Kolesnikov, S. A. Movchan, A. Ribakov, F. Levchanovsky, Yu.V. Zanevsky, V.V. Chepurnov, J. Lukstins, V. Zruev, V. F. Chepurnov, A. Bazhazhin, S. P. Chernenko, and S. Razin

Subjects
Physics, Nuclotron, Time projection chamber, Luminosity (scattering theory), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Readout electronics, Tracking (particle physics), 01 natural sciences, Particle identification, law.invention, Nuclear physics, law, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Collider, Instrumentation, Mathematical Physics
Abstract

In a frame of the JINR scientific program on study of hot and dense baryonic matter a new accelerator complex Ion Collider fAcility (NICA) based on the Nuclotron-M is under realization. It will operate at luminosity up to 1027 cm−2s−1 for Au79+ ions. Two interaction points are foreseen at NICA for two detectors which will operate simultaneously. One of these detectors, the Multi-Purpose Detector (MPD), is optimized for investigations of heavy-ion collisions. The Time-Projection Chamber (TPC) is the main tracking detector of the MPD central barrel. It is a well-known detector for 3-dimensional tracking and particle identification for high multiplicity events. The conceptual layout of MPD and detailed description of the design and main working parameters of TPC, the readout system based on MWPC and readout electronics as well as the TPC subsystems and tooling for assembling and integration TPC into MPD are presented.

Published
2017

28. AssociateK0production inp+pcollisions at 3.5 GeV: The role ofΔ(1232)++

Author

Yu. G. Sobolev, C. Müntz, G. Kornakov, I. Koenig, B. Spruck, B. Kämpfer, Filip Krizek, E. Schwab, T. Kunz, A. Sadovsky, Alexander Belyaev, I. Iori, A.P. Ierusalimov, H. Ströbele, M.B. Golubeva, A. Dybczak, M. Gumberidze, V. Wagner, J. L. Boyard, J. C. Berger-Chen, A. Krása, Andrey Reshetin, T. Heinz, A. Rustamov, R. H. Munzer, L. Lopes, R. Krücken, P. Tlusty, P. Cabanelas, Kirill Lapidus, V. P. Ladygin, B. W. Kolb, A. M. Schmah, Kathrin Göbel, Yiannis Parpottas, J. Siebenson, Alexey Kurepin, D. González-Díaz, C. Sturm, B. Ramstein, A. Tarantola, J. A. Garzón, Eliane Epple, M. Jurkovic, Marc Weber, V. Metag, T. A. Vasiliev, M. Lorenz, K. Teilab, G. Agakishiev, W. Kühn, H. Tsertos, Paolo Finocchiaro, J. Stroth, F.F. Guber, Roman Gernhäuser, M. Böhmer, A. Mangiarotti, A. Kugler, Yvonne Chiara Pachmayer, D. Belver, C. Wendisch, Marek Palka, J. Friese, T. Galatyuk, G. Korcyl, S. Yurevich, R. Lalik, L. Maier, P. Salabura, I. Fröhlich, O. V. Fateev, Witold Przygoda, T. Hennino, R. Holzmann, J. Markert, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, Tatiana Karavicheva, Laura Fabbietti, Oliver Werner Arnold, H. Kuc, L. Naumann, O. Pechenova, J. Pietraszko, S. P. Chernenko, V. Pechenov, J. Michel, A. Lebedev, J. Wüstenfeld, M. Traxler, W. Koenig, and Yu.V. Zanevsky

Subjects
Physics, Nuclear physics, Event selection, Nuclear and High Energy Physics, Angular distribution, Phase space, Mass spectrum, Invariant mass, Production (computer science), Atomic physics, Kinetic energy
Abstract

An exclusive analysis of the four-body final states Λ+p+π++K0 and Σ0+p+π++K0 measured with HADES for p+p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four-particle event selection (p,π+,π+,π-) to find cross sections of the different production channels, contributions of the intermediate resonances Δ++ and Σ(1385)+, and corresponding angular distributions. A dominant resonant production is seen, where the reaction Λ+Δ+++K0 has a cross section about ten times higher (29.45±0.08-1.46+1.67±2.06μb) than the analogous nonresonant reaction (2.57±0.02-1.98+0.21±0.18μb). A similar result is obtained in the corresponding Σ0 channels with 9.26±0.05-0.31+1.41±0.65μb in the resonant and 1.35±0.02-1.35+0.10±0.09μb in the nonresonant reactions. © 2014 American Physical Society.

Published
2014

29. [Untitled]

Author

V. V. Lauter, A. V. Petrenko, Yu. V. Nikitenko, H. Lauter, S. V. Kozhevnikov, O. V. Fateev, S. P. Chernenko, G.A. Cheremukhina, and Yu.V. Zanevsky

Subjects
Physics, Spectrometer, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutron temperature, Time of flight, Wavelength, Optics, Neutron, Nuclear Experiment, business, Instrumentation, Sensitivity (electronics), Image resolution
Abstract

A linear detector of thermal neutrons, developed at the Laboratory for High Energies (Joint Institute for Nuclear Research), is used in the polarized-neutron spectrometer of the aAe-2 reactor (JINR). The data are acquired in the regime of frame-by-frame survey to select neutrons with a wavelength λ = 1—12 A by the time of flight. The neutron-detection efficiency is ~70% for a wavelength of 2 A. The detector exhibits a low sensitivity to γ -rays, a dif- ferential nonlinearity of ~1.5%, and a spatial resolution of ~1.5 mm at counting rates of ~10 5 events/s.

Published
2001

30. Construction and testing of the ALICE TRD chambers at LHE, JINR

Author

Yu. Krasnov, S. P. Chernenko, Yu.V. Zanevsky, A. N. Zubarev, V. F. Chepurnov, S. Razin, V. Belyakov, N. Scherbakov, A. Moskovsky, and O. V. Fateev

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Radiation, Radiology, Nuclear Medicine and imaging, ALICE (propellant), Atomic and Molecular Physics, and Optics, Particle detector, Particle identification
Abstract

The current status of construction and testing of Transition Radiation Detectors (TRD) for ALICE at LHE, JINR, is presented. The main purpose of this detector is electron identification at intensive pion background. The whole ALICE TRD system is comprised of 540 wire chambers of total sensitive area ∼750 m2. Each chamber consists of drift and amplifying gaps and a radiator. One hundred such TRD chambers will be constructed at LHE, JINR.

Published
2008

31. X-ray detectors based on multiwire proportional chambers

Author

M. S. Dubrovin, Yu. G. Ukraintsev, Alexey Talyshev, G.A. Savinov, A.G. Khabakhpashev, V.V. Porosev, V.R. Groshev, Yu. S. Velikzhanin, E. L. Nekhanevich, E.A. Babichev, S.E. Baru, L. Smykov, L. Shekhtman, V.M. Titov, Yu.V. Zanevsky, and V.M. Aulchenko

Subjects
Physics, Nuclear and High Energy Physics, Wire chamber, business.industry, Detector, X-ray detector, Bremsstrahlung, Synchrotron radiation, Particle detector, Optics, business, Instrumentation, Image resolution, Storage ring
Abstract

The multiwire proportional chamber (MWPC), operating in a direct photon-counting mode, is used as the basis of 1D and 2D X-ray detectors. The 1D detector used in our scanning radiographic systems is serially produced. Its counting rate is about 200 MHz, its spatial resolution 0.6 mm, the number of channels is 640. The 2D detector, designed for diffraction structural researches on synchrotron radiation at the storage ring VEPP-3, is being commissioned now. Its characteristics are: 5 MHz, 1.5 mm, 65536 channels. The second 1D detector (10 MHz, 75 μm, 3300 channels, σ = 150 μm) is made for the same purposes. A third 1D detector with a registration angle of 60° (500 MHz, 0.6 mm, 1900 channels) is under development. All the detectors operate in a frame-by-frame mode and are free (except 2D) of parallax error.

Published
1997

32. Inclusive pion andηproduction inp+Nb collisions at 3.5 GeV beam energy

Author

M.B. Golubeva, B. Spruck, Yu.V. Zanevsky, J. A. Garzón, P. Tlusty, Kirill Lapidus, Andrey Reshetin, M. Jurkovic, A. M. Schmah, C. Wendisch, Kathrin Göbel, I. Koenig, Laura Fabbietti, A. Balanda, S. Lang, R. Trebacz, F.F. Guber, S. Spataro, H. Ströbele, K. Teilab, S. Yurevich, Yu. G. Sobolev, B. Kämpfer, I. Iori, G. Agakishiev, C. Sturm, I. Fröhlich, M. Böhmer, A. Mangiarotti, V. Wagner, C. Müntz, J. L. Boyard, V. Metag, M. Lorenz, T. Heinz, E. Epple, Paolo Finocchiaro, Yvonne Chiara Pachmayer, Alexander Belyaev, V. P. Ladygin, L. Maier, R. Holzmann, J. Markert, M. Gumberidze, B. W. Kolb, J. Stroth, J. Friese, T. Hennino, W. Koenig, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, Roman Gernhäuser, H. Kuc, G. Kornakov, O. V. Fateev, A. Kugler, Yiannis Parpottas, Tatiana Karavicheva, L. Naumann, V. Pechenov, P. Cabanelas, Alexey Kurepin, D. González-Díaz, Marc Weber, W. Kühn, P. Salabura, H. Tsertos, A. Tarantola, Tetyana Galatyuk, R. Lalik, T. Liu, A. Lebedev, B. Ramstein, L. Lopes, S. P. Chernenko, Filip Krizek, R. Krücken, A. Dybczak, D. Belver, J. Michel, J. C. Berger-Chen, J. Wüstenfeld, M. Traxler, A. Krása, J. Siebenson, T. A. Vasiliev, Witold Przygoda, O. Pechenova, Marek Palka, E. Schwab, A. Sadovsky, J. Pietraszko, A.P. Ierusalimov, B. Michalska, and A. Rustamov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Transport theory, Kinetic energy, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Production (computer science), Nuclear Experiment, 010306 general physics, Beam energy, Energy (signal processing)
Abstract

Data on inclusive pion and $\ensuremath{\eta}$ production measured with the dielectron spectrometer HADES in the reaction $p+{}^{93}\mathrm{Nb}$ at a kinetic beam energy of 3.5 GeV are presented. Our results, obtained with the photon-conversion method, supplement the rather sparse information on neutral-meson production in proton-nucleus reactions existing for this bombarding energy regime. The reconstructed ${e}^{+}{e}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}}$ transverse-momentum and rapidity distributions are confronted with transport-model calculations, which account fairly well for both ${\ensuremath{\pi}}^{0}$ and $\ensuremath{\eta}$ production.

Published
2013

33. New data on the differential cross section of dp-elastic scattering at 2.5 GeV with HADES Detector

Author

F.F. Guber, M. Böhmer, A. Mangiarotti, B. Kämpfer, J. A. Garzón, M. Gumberidze, A. Sadovsky, Yiannis Parpottas, P. Huck, H. Schuldes, M. Jurkovic, J. Friese, C. Höhne, A. K. Kurilkin, T. A. Vasiliev, A.P. Ierusalimov, Alexey Kurepin, D. González-Díaz, D. Belver, C. Wendisch, V. Pechenov, M.B. Golubeva, L. Lopes, C. Sturm, Yu.V. Zanevsky, P. K. Kurilkin, T. Galatyuk, Piotr Salabura, L. Maier, A. Rustamov, A. Lebedev, K. Gill, H. Kuc, Andrey Reshetin, S. Yurevich, R. Holzmann, L. Naumann, M. Weber, Filip Krizek, R. H. Munzer, J. Markert, O. Pechenova, B. Ramstein, L. Rehnisch, C. Dritsa, M. Traxler, V. Metag, J. Pietraszko, M. Lorenz, P. Cabanelas, A. Tarantola, H. Ströbele, S. P. Chernenko, K. Teilab, O. V. Fateev, V. Wagner, J. Michel, Yu. G. Sobolev, A. Kugler, S. Harabasz, E. Krebs, P. Tlusty, C. Müntz, J. Wüstenfeld, Kirill Lapidus, J. Siebenson, T. Scheib, H. Tsertos, J. Stroth, Marek Palka, O. Svoboda, G. Korcyl, W. Koenig, R. Lalik, Laura Fabbietti, S. Spataro, I. Fröhlich, S. Lang, G. Kornakov, Tatiana Karavicheva, C. Behnke, Eliane Epple, Alexander Belyaev, G. Agakishiev, T. Hennino, I. Koenig, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, P. Strzempek, Christoph Blume, A. Dybczak, J. C. Berger-Chen, A. Krása, B. W. Kolb, Witold Przygoda, and V. P. Ladygin

Subjects
Physics, Elastic scattering, Nuclear physics, Spectrometer, Deuterium, Scattering, Nuclear Theory, Detector, Center of mass, Nuclear Experiment, Wave function, Kinetic energy
Abstract

New results on the differential cross section in deuteron-proton elastic scattering are obtained at the deuteron kinetic energy of 2.5 GeV with the HADES spectrometer. The angular range of 69°-125° in the center of mass system is covered. The obtained results are compared with the relativistic multiple scattering model calculation using the CD-Bonn deuteron wave function. The data at fixed scattering angles in the c.m. are in qualitative agreement with the constituent counting rules prediction.

Published
2013

34. Time Projection Chamber for Multi-Purpose Detector at NICA

Author

S. Razin, S.A. Zaporozhets, V. Zruyev, A. Ribakov, A. Bajajin, S. P. Chernenko, G.A. Cheremukhina, V. Samsonov, S. A. Movchan, F. Levchanovskiy, A. M. Korotkova, A. Pilyar, Yu.V. Zanevsky, A. V. Averyanov, V.V. Chepurnov, J. Lukstins, S. Vereschagin, O. V. Fateev, Yu. Kiriushin, and V. F. Chepurnov

Subjects
Physics, Optics, Time projection chamber, business.industry, Detector, General Physics and Astronomy, business
Published
2016

35. Polarization components in π0 photoproduction at photon energies up to 5.6 GeV

Author

M. Commisso, C. E. Keppel, L. Y. Zhu, Emil Frlez, L. Solovyev, S. Frullani, V. A. Punjabi, I. Albayrak, G. Mbianda, D. G. Meekins, I. I. Strakovsky, P. Bosted, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, Y. Zhang, M. Meziane, E. Jensen, Donal Day, C. F. Perdrisat, A. Mkrtchyan, H. Mkrtchyan, A. Ahmidouch, P. E. Reimer, W. Hinton, H. C. Fenker, Nuruzzaman, E. J. Brash, Omar Moreno, S. Dhamija, P. M. King, Di. Kirillov, I. Sitnik, Y. Li, A. Asaturyan, A. Shahinyan, D. S. Razin, Fatiha Benmokhtar, Y. Matulenko, S. A. Wood, A. Daniel, E. Piasetzky, M. H. Shabestari, D. J. Margaziotis, S. Danagoulian, M. Veilleux, X. Zhang, V. Mamyan, E. Tomasi-Gustafsson, J. Huang, A. Davidenko, O. Ates, Dipanwita Dutta, L. Bimbot, Ronald Gilman, K. Hafidi, V. Kravtsov, Y. Goncharenko, J. Arrington, Yu.M. Mel'nik, Y. Prok, A. J. R. Puckett, Z. Ye, H. Baghdasaryan, F. R. Wesselmann, Bi-Tao Hu, William Bertozzi, Lubomir Pentchev, R. Subedi, S. P. Chernenko, Riad Suleiman, Simon Širca, G. M. Huber, F. Garibaldi, S. Covrig, David Hamilton, C. Butuceanu, Pete Markowitz, Amrendra Narayan, Rolf Ent, J. Mulholland, L. Smykov, D. Gaskell, Michael Kohl, S. Nedev, P. Carter, M. Khandaker, Tanja Horn, James A. Miller, G. J. Kumbartzki, M. E. Christy, James Maxwell, J. Reinhold, X. Zheng, O. Rondon, W. Luo, George Davey Smith, Ronald Ransome, Shalev Gilad, J. C. Cornejo, W. U. Boeglin, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, W. Pierce, Yu.V. Zanevsky, P. Solvignon, H. Kang, K. Shestermanov, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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
Quantum chromodynamics, Physics, Particle physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, General Physics and Astronomy, Perturbative QCD, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Photon energy, 01 natural sciences, 7. Clean energy, Helicity, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

We present new data for the polarization observables of the final state proton in the $^{1}H(\vec{\gamma},\vec{p})\pi^{0}$ reaction. These data can be used to test predictions based on hadron helicity conservation (HHC) and perturbative QCD (pQCD). These data have both small statistical and systematic uncertainties, and were obtained with beam energies between 1.8 and 5.6 GeV and for $\pi^{0}$ scattering angles larger than 75$^{\circ}$ in center-of-mass (c.m.) frame. The data extend the polarization measurements data base for neutral pion photoproduction up to $E_{\gamma}=5.6 GeV$. The results show non-zero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and $\pi^{0}$ scattering angle in c.m. frame. This indicates that HHC does not hold and that the pQCD limit is still not reached in the energy regime of this experiment., Comment: 6 pages and 2 figures

Published
2012

36. Baryonic resonances close to theK¯Nthreshold: The case ofΣ(1385)+inppcollisions

Author

T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, Marek Palka, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, B. Kämpfer, W. Kühn, L. Lopes, J. A. Garzón, I. Koenig, R. Krücken, Yu.V. Zanevsky, Tatiana Karavicheva, E. Schwab, M. Jurkovic, M. Gumberidze, Laura Fabbietti, D. Belver, A. Sadovsky, B. Ramstein, F. Dohrmann, R. Trebacz, V. Pechenov, Andrey Reshetin, Alexander Belyaev, C. Sturm, A.P. Ierusalimov, H. Kuc, A. Balanda, K. Teilab, J. S. Lange, R. H. Munzer, S. Spataro, I. Fröhlich, R. Holzmann, J. Markert, L. Naumann, M. Weber, H. Ströbele, B. Spruck, W. Koenig, Yvonne Chiara Pachmayer, A. Dybczak, T. Galatyuk, J. C. Berger-Chen, T. Christ, C. Wendisch, V. Wagner, Eliane Epple, Jehad Mousa, O. Pechenova, L. Maier, A. Krása, S. P. Chernenko, A. Rustamov, J. Michel, J. Pietraszko, M. Destefanis, T. Heinz, I. Iori, J. Wüstenfeld, J. Stroth, Yiannis Parpottas, Roman Gernhäuser, A. Kugler, S. Yurevich, E. Morinière, Yu. G. Sobolev, Alexey Kurepin, D. González-Díaz, P. Cabanelas, C. Müntz, Kalliopi Kanaki, H. Tsertos, V. Metag, O. V. Fateev, M. Traxler, M. Lorenz, R. Lalik, T. Liu, M.B. Golubeva, P. Tlusty, B. W. Kolb, Kirill Lapidus, J. Siebenson, A. M. Schmah, E. Castro, P. Salabura, Filip Krizek, S. Lang, J. L. Boyard, G. Agakishiev, Paolo Finocchiaro, J. Friese, B. Michalska, Witold Przygoda, F.F. Guber, M. Böhmer, A. Mangiarotti, and A. Tarantola

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hyperon, Sigma, 01 natural sciences, Baryon, Angular distribution, 0103 physical sciences, Production (computer science), Invariant mass, Atomic physics, 010306 general physics, Beam energy, Bar (unit)
Abstract

We present results of an exclusive measurement of the first-excited state of the $\ensuremath{\Sigma}$ hyperon, $\ensuremath{\Sigma}{(1385)}^{+}$, produced in $p+p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}+{K}^{+}+n$ at $3.5\phantom{\rule{0.28em}{0ex}}\mathrm{GeV}$ beam energy. The extracted data allow the detailed study of the invariant mass distribution of the $\ensuremath{\Sigma}{(1385)}^{+}$. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at ${m}_{0}=1383.2\ifmmode\pm\else\textpm\fi{}0.9\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$ and a width of $40.2\ifmmode\pm\else\textpm\fi{}2.1\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$. The exclusive production cross section comes out to be $22.27\ifmmode\pm\else\textpm\fi{}0.89\ifmmode\pm\else\textpm\fi{}1.{56}_{\ensuremath{-}2.10}^{+3.07}\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}b$. Angular distributions of the $\ensuremath{\Sigma}{(1385)}^{+}$ in different reference frames are found to be compatible with the hypothesis that $33%$ of $\ensuremath{\Sigma}{(1385)}^{+}$ result from the decay of an intermediate broad ${\ensuremath{\Delta}}^{++}$ excitation at about $2000\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/{c}^{2}$.

Published
2012

37. Probing properties of nuclear matter with HADES

Author

Yu.V. Zanevsky, S. P. Chernenko, J. Michel, T. A. Vasiliev, A. Sadovsky, J. Wüstenfeld, J. Friese, A.P. Ierusalimov, A. Dybczak, H. Kuc, B. Kämpfer, L. Naumann, M. Weber, A. Balanda, T. Galatyuk, R. Holzmann, J. Markert, A. Rustamov, A. Krása, Andrey Reshetin, M. Gumberidze, J. Stroth, L. Maier, Marek Palka, P. Cabanelas, A. Tarantola, O. V. Fateev, A. Kugler, K. Teilab, V. Pechenov, B. Michalska, J. Lamas-Valverde, A. K. Kurilkin, J. Siebenson, B. W. Kolb, W. Kühn, Yvonne Chiara Pachmayer, T. Liu, S. Yurevich, P. Tlusty, Kirill Lapidus, Tatiana Karavicheva, G. Agakishiev, R. Krücken, Grzegorz Korcyl, D. Belver, I. Koenig, A. Kozuch, V. Metag, A. M. Schmah, O. Pechenova, Paolo Finocchiaro, H. Tsertos, M. Lorenz, Witold Przygoda, L. Lopes, B. Ramstein, F.F. Guber, H. Ströbele, P. K. Kählitz, S. Lang, W. Koenig, M. Böhmer, A. Mangiarotti, Laura Fabbietti, V. Wagner, J. Roskoss, Ana M. Gil, J. Pietraszko, S. Spataro, I. Fröhlich, T. Hennino, Yiannis Parpottas, J. A. Garzón, Eliane Epple, M.B. Golubeva, Alexey Kurepin, D. González-Díaz, J. S. Díaz, M. Jurkovic, A. Blanco, P. Fonte, Yu. G. Sobolev, R. Trebacz, A. Ivashkin, R. Kotte, C. Müntz, Alexander Belyaev, M. Traxler, P. K. Kurilkin, Filip Krizek, E. Castro, P. Salabura, V. P. Ladygin, J. L. Boyard, G. Kornakov, C. Sturm, I. Iori, and P. Huck

Subjects
Physics, Nuclear physics, Particle physics, Nuclear matter
Abstract

G. Agakishiev6, A. Balanda3, D. Belver16, A. Belyaev6, A. Blanco2, M. Bohmer9, J. L. Boyard14, P. Cabanelas16, E. Castro16, S. Chernenko6, J. Diaz17, A. Dybczak3, E. Epple8, L. Fabbietti8, O. Fateev6, P. Finocchiaro1, P. Fonte2,b, J. Friese9, I. Frohlich7, T. Galatyuk7,c, J. A. Garzon16, A. Gil17, M. Golubeva12, D. Gonzalez-Diazd , F. Guber12, M. Gumberidze14, T. Hennino14, R. Holzmann4, P. Huck9, A. Ierusalimov6, I. Iori11, f , A. Ivashkin12, M. Jurkovic9, B. Kampfer5,e, T. Karavicheva12, I. Koenig4, W. Koenig4, B. W. Kolb4, G. Korcyl3, G. Kornakov16, R. Kotte5, A. Kozuch3,g, A. Krasa15, F. Krizek15, R. Krucken9, H. Kuc3,14, W. Kuhn10, A. Kugler15, A. Kurepin12, A. Kurilkin6, P. Kurilkin6, P. Kahlitz5, V. Ladygin6, J. Lamas-Valverde16, S. Lang4, K. Lapidus8, T. Liu14, L. Lopes2, M. Lorenz7, L. Maier9, A. Mangiarotti2, J. Markert7, V. Metag10, B. Michalska3, J. Michel7, C. Muntz7, L. Naumann5, Y. C. Pachmayer7, M. Palka7, Y. Parpottas13, V. Pechenov4, O. Pechenova7, J. Pietraszko7, W. Przygoda3, B. Ramstein14, A. Reshetin12, J. Roskoss10, A. Rustamov4, A. Sadovsky12, P. Salabura3, A. Schmaha, J. Siebenson8, Yu.G. Sobolev15, S. Spataroh, H. Strobele7, J. Stroth7,4, C. Sturm4, A. Tarantola7, K. Teilab7, P. Tlusty15, M. Traxler4, R. Trebacz3, H. Tsertos13, T. Vasiliev6, V. Wagner15, M. Weber9, J. Wustenfeld5, S. Yurevich4, Y. Zanevsky6 (HADES collaboration)

Published
2011

38. Search for Effects Beyond the Born Approximation in Polarization Transfer Observables ine→pElastic Scattering

Author

M. H. Shabestari, O. Ates, I. Albayrak, T. Horn, L. Pentchev, M. Commisso, H. Mkrtchyan, C. E. Keppel, Ronald Ransome, D. J. Margaziotis, W. Pierce, X. Zhang, Y. Matulenko, L. Y. Zhu, Emil Frlez, G. R. Smith, W. Hinton, John Arrington, D. G. Meekins, I. Sitnik, Ronald Gilman, A. Asaturyan, L. Bimbot, P. Solvignon, S. Covrig, E. Piasetzky, F. R. Wesselmann, Shalev Gilad, H. Baghdasaryan, W. U. Boeglin, J. Huang, P. M. King, Douglas Higinbotham, C. F. Perdrisat, M. K. Jones, N. M. Piskunov, P. Bosted, Z. Ye, L. Smykov, G. Mbianda, Y. Li, Kravtsov, K. A. Aniol, K. Hafidi, E. Jensen, Dipangkar Dutta, E. Tomasi-Gustafsson, William Bertozzi, James A. Miller, Y. Zhang, J. Reinhold, O. Moreno, David Hamilton, W. Luo, D. S. Razin, Pete Markowitz, M. Khandaker, Bogdan Wojtsekhowski, James Maxwell, P. E. Reimer, Donal Day, O. Rondon, Michael Kohl, S. Nedev, X. Zheng, P. Carter, S. P. Chernenko, D. Kirillov, Andrey Vasiliev, A. Marsh, C. Butuceanu, L. Solovyev, G. Kumbartzki, Marc Vanderhaeghen, Amrendra Narayan, Fatiha Benmokhtar, B. Hu, D. Gaskell, E. Christy, Yu.M. Mel'nik, Punjabi, S. A. Wood, A. Ahmidouch, M. Veilleux, A. Mkrtchyan, S. Frullani, J. Mulholland, R. Subedi, S. Dhamija, S. Danagoulian, B. Moffit, Yu.V. Zanevsky, Y. Prok, K. Shestermanov, M. Meziane, A. Davidenko, Mamyan, J. C. Cornejo, H. Kang, H. C. Fenker, Nuruzzaman, Rolf Ent, A. Shahinyan, Y. Goncharenko, Simon Širca, G. M. Huber, F. Garibaldi, A. J. R. Puckett, A. Daniel, R. Suleiman, and E. J. Brash

Subjects
Elastic scattering, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Momentum transfer, General Physics and Astronomy, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Magnetic form factor, High Energy Physics::Experiment, Born approximation, 010306 general physics, Nucleon
Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $$G_{E}/G_{M}$$, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange (TPEX) contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic $$H(\vec{e},e'\vec{p})$$ reaction for three different beam energies at a fixed squared momentum transfer $Q^2 = 2.5$ GeV$^2$, spanning a wide range of the virtual photon polarization parameter, $$\epsilon$$. From these measured polarization observables, we have obtained separately the ratio $R$, which equals $$\mu_p G_{E}/G_{M}$$ in the Born approximation, and the longitudinal polarization transfer component $$P_\ell$$, with statistical and systematic uncertainties of $$\Delta R \approx \pm 0.01 \mbox{(stat)} \pm 0.013 \mbox{(syst)}$$ and $$\Delta P_\ell/P^{Born}_{\ell} \approx \pm 0.006 \mbox{(stat)}\pm 0.01 \mbox{(syst)}$$. The ratio $R$ is found to be independent of $$\epsilon$$ at the 1.5% level, while the $$\epsilon$$ dependence of $$P_\ell$$ shows an enhancement of $$(2.3 \pm 0.6) %$$ relative to the Born approximation at large $$\epsilon$$.

Published
2011

39. Two-pion Bose-Einstein correlations inppcollisions ats=900 GeV

Author

F. Piuz, C. Baumann, Csaba Soos, L. K. Mangotra, M. Kutouski, Eleazar Cuautle, K. Mizoguchi, Y. Hori, A. Szanto de Toledo, Trine Spedstad Tveter, J. Kapitan, Chiara Zampolli, Sara Vallero, Vladimir Samsonov, C.W. Fabjan, T. Iwasaki, P. Pillot, I. Otterlund, Madan M. Aggarwal, S. Radomski, A. G. Asryan, I. Martashvili, Ken Oyama, Francesco Noferini, P. Jovanovic, Luciano Musa, Ante Bilandzic, T. Pawlak, G. O.V. de Barros, G. Bourdaud, J. F. Castillo Hernandez, Marta Verweij, Cynthia Marie Hadjidakis, V. Altini, E. Dénes, A. Uras, A. I. Pavlinov, A. B. Kaidalov, S. Lohn, J. Mlynarz, B. Polichtchouk, Enrichetta Maria Fiore, A. Borisov, D. Y.-U. Peressounko, Andrey Reshetin, A. Fernández Téllez, Ewa Gladysz-dziadus, Kyong Sei Lee, Jan Rak, Massimo Masera, Jean-Yves Grossiord, M. E. Cotallo, C. Pérez, C. Tagridis, Yu. V. Kharlov, S. Yasnopolskiy, Natalia Kondratyeva, Mateusz Andrzej Ploskon, Sang Un Ahn, V. Lafage, V. Lenti, B. Grinyov, Adela Kravcakova, Ulrich Fuchs, Siegfried Valentin Foertsch, Neetika Sharma, Kirill Voloshin, D. Hasch, N. Willis, V. Catanescu, J. Newby, N. Pitz, J. H. Kang, Federico Ronchetti, Andre Mischke, F. Painke, Marcello Lunardon, Stefan Kirsch, V. Chibante Barroso, V. Nikolic, A. Jacholkowski, Wisla Carena, Martino Gagliardi, Krzysztof Redlich, Raghunath Sahoo, W. W. Jung, P. Kaliňák, Peter Chochula, Christophe Pierre Suire, Marian Putis, I. Sgura, C. D. Anson, Z. Conesa del Valle, J. Dubuisson, V. Zycháček, Q. Wen, G. T. Jones, Shih-Chang Lee, V. Chambert, F. Lackner, Filippo Costa, V. I. Yurevich, Rosario Turrisi, Oliver Busch, Magdalena Malek, J. Zhu, Davide Falchieri, M. Cherney, S. Hu, Teodor Siemiarczuk, Subrata Pal, I. Hřivnáčová, Marian Ivanov, D. Di Bari, M. S. Ganti, Valerie Ramillien Barret, P. R. Pujahari, D. Hasegan, T. Kalliokoski, R. Kolevatov, G. Mazza, A. Di Mauro, Z. Fodor, M. Krus, H. Oeschler, N. Novitzky, E. Biolcati, A. Zepeda, Y. Okada, V. Angelov, L. Toscano, S. Prasad, L. Wallet, P. T. Hille, M. Szuba, S. Esumi, M. Irfan, Marco De Petris, A. Turvey, Gualtiero Volpe, Prithwish Tribedy, B. K. Srivastava, Nicolas Bock, Alberto Masoni, Martin Vala, Amalia Pop, Rachid Guernane, Chitrasen Jena, Imrich Szarka, Nicole Bastid, F. Furano, Federico Carminati, G. Luparello, P.A. Polozov, Bedangadas Mohanty, R. Glasow, C. Pajares, J. P. Coffin, Fiorella Fionda, Y. Mao, Ajay Kumar Dash, G. Stefanek, Meidana Huang, K. Aamodt, Paolo Giubellino, Philippe Crochet, Peter Braun-Munzinger, Sanjeev Singh Sambyal, L. Jirden, M. Kalisky, Roberta Ferretti, Oleg Karavichev, Benjamin Donigus, Rosario Nania, Junlee Kim, S. Gorbunov, A. J. Rubio-Montero, J. Bielcikova, Haavard Helstrup, Alberica Toia, Lijiao Liu, A. Klovning, Y. Maruyama, M. Rammler, S. Antinori, Paolo Pagano, S. De Pasquale, L. Montaño Zetina, B. Boyer, A. Abrahantes Quintana, R. Platt, J. S. Kim, Vladimir Nikulin, Maria Haiduc, Boris Hippolyte, T.M. Steinbeck, J. Ulery, G. Odyniec, Pietro Cortese, S. Senyukov, M. Morando, Bruno Espagnon, L. Cunqueiro, A. Rachevski, Premomoy Ghosh, Xing-Bo Yuan, Philippe Rosnet, T. S. Räihä, H. A. Gustafsson, Sven Gotovac, L. Manceau, B. V.K.S. Potukuchi, Atsushi Takahara, E. Chiavassa, M. Bombara, C. Cavicchioli, I. Makhlyueva, A. Pulvirenti, F. Yermia, N. Herrmann, E. Cattaruzza, M. De Gaspari, D. Krumbhorn, A. A. Vinogradov, R. Gemme, Frederick Kramer, T. Krawutschke, M. Tavlet, A. Tournaire, V. Petráček, Ruben Shahoyan, F. Formenti, Hyun-Chul Kim, L. V. Malinina, R. Janik, Iouri Belikov, Thomas Dietel, J. Bán, C. Hernández, Janka Vrlakova, V. Wagner, L. Vannucci, J. Pouthas, R. de Rooij, Alessandro Grelli, Z. L. Matthews, H.R. Gulkanyan, Marcel Araujo Silva Figueredo, Carlos A. Salgado, Roman Lietava, T. Horaguchi, A. Punin, Christophe Furget, S. Bablok, A. K. Dutta Majumdar, E. Fragiacomo, Jean Willy Andre Cleymans, Francesca Soramel, Thomas Michael Cormier, E. G. Ferreiro, R. Gómez Jiménez, Ralf Keidel, Sami Sakari Rasanen, F. Osmic, Dmitry Blau, C. Roy, J. Mercado Pérez, P. La Rocca, E. López Torres, Tatsuya Chujo, A. Kolojvari, Paul Constantin, R. A. Soltz, F. Tosello, Anju Bhasin, G. Conesa Balbastre, C. Lara, Peter Martin Jacobs, Arturo Alejandro Menchaca-Rocha, Jon Christopher Wikne, T. Tolyhy, A. M. Gago, Y. J. Kwon, A. Martínez Davalos, A. Hayrapetyan, D. Vranic, Vitaly Loginov, Ian Gardner Bearden, A. Matyja, Andrea Alici, E. Berdermann, Sergey Nazarenko, O. V. Fateev, K. J. Malagalage, Adrian Sevcenco, Lokesh Kumar, G. A. Feofilov, A. Baldit, Giacomo Bruno, G. P. Capitani, A. Nianine, Alexey Kuryakin, Filimon Roukoutakis, Pablo Saiz, Yongwook Baek, Peter Levai, D. Hatzifotiadou, Predrag Buncic, Kenneth Francis Read, I. Vetlitskiy, E. Kornaś, Valery Punin, M. I. Martínez Hernández, M. A. Braun, S. Kapusta, R. Bellwied, S.A. Zaporozhets, D. De Gruttola, D. T. Larsen, H. Tydesjö, J. Urban, Andrey Zarochentsev, I. Rusanov, J. de Cuveland, Mihai Petrovici, Yu.N. Pestov, Peter Strmen, Luciana Bianchi, Henning Kværnø, Ara Grigoryan, G. Sharkov, D. Elia, H. Taureg, M. Zhalov, Laszlo Boldizsar, J. Takahashi, C. Di Giglio, Andry Malala Rakotozafindrabe, A. Konevskih, A. Peters, M. Mastromarco, Leonid Vinogradov, D. M.M. Don, Vito Manzari, Latchezar Betev, J. J. Gaardhøje, Alexey Bogdanov, Raphaelle Marie Bailhache, Dai-Mei Zhou, Vladimir Vechernin, Franco Meddi, Dmitry Aleksandrov, C. Bortolin, Brigitte Cheynis, Franck Manso, Hannes Jung, Adriana Telesca, Ermanno Vercellin, I. S. Zgura, Podist Kurashvili, Panagiotis Christakoglou, Hans Rudolf Schmidt, Xuan Zhang, A. K. Bhati, A. Kamal, Y. P. Viyogi, G. Puddu, H. H. Gutbrod, Bernd Stefan Windelband, Varlen Grabski, Néstor Armesto, D. M. Madagodahettige-Don, I. Kraus, Michal Sumbera, A. Colla, Laurent Ducroux, M. Basile, M. A. Mazzoni, Jean-Pierre Cussonneau, B. Ghidini, T. J. Humanic, Hideki Hamagaki, Gunnar Løvhøiden, Anselmo Margotti, Giacomo Ortona, K. Šafařík, Cvetan Valeriev Cheshkov, M. Boccioli, Alexey Kurepin, Peter Glassel, Gyulnara Eyyubova, Mikolaj Krzewicki, Xing Long Li, Tomasz Traczyk, M. Botje, Andres Sandoval, Raffaele Grosso, Roberta Arnaldi, A. I. Zinchenko, G. Stefanini, Gergely Gabor Barnafoldi, Maya Hachiya Shimomura, A. Maire, Anton Jusko, Ivan Kralik, Ozgur Cobanoglu, Miroslav Pikna, Mario Sitta, R. Arceo, Rui Ma, N. van der Kolk, R. Kamermans, Eva Sicking, Dosatsu Sakata, Kristjan Herlache Gulbrandsen, Johannes Peter Wessels, M. Meoni, R. Tanabe, S. Jangal, D. Swoboda, Mikhail Malaev, E. Simili, M. Fragkiadakis, Johanna Stachel, H. S. Lee, R. N. Singaraju, E. S. Conner, Cristian Andrei, Nazeer Ahmad, Alexander Philipp Kalweit, C. Ivan, Olja Dordic, H. Ricaud, J. Peyré, Dong Jo Kim, F. Minafra, J. Wiechula, G.F. Segato, G. de Cataldo, I. Vassiliev, Juha Äystö, Isabel Dominguez, S. Coli, R. W. Fearick, Francesco Barile, L. V. Bravina, Giuseppe Viesti, Andrei Gheata, Y. Delgado, V. Pospíšil, Giacomo Contin, M. Pachr, Nicola Bianchi, E. Kang, C. Yang, J. Thäder, G.S. Shabratova, Shuaib Ahmad Khan, T. P. Sinha, D. Budnikov, Hanna Paulina Zbroszczyk, S. Navin, T. Breitner, M. A. Subieta Vásquez, Linda Vickovic, Silvia Arcelli, Y. G. Kim, E. Crescio, D. Fabris, M. Bach, R. Varma, L. Bosisio, Z. Vilakazi, N. Le Bris, B. von Haller, J. S. Real, A. Abramyan, Ki-Seok Choi, Motoi Inaba, F. Bossú, G. Russo, Alexander Kluge, Radiy Ilkaev, G. de Vaux, U. Abeysekara, F. Carena, A. G. Agocs, F. Blanco, Jacek Tomasz Otwinowski, J. Bohm, Bastian Bathen, Annalisa Mastroserio, Jan Fiete Grosse-Oetringhaus, G. D'Erasmo, Alina Gabriela Grigoras, G. Tröger, Seyong Kim, Alessandra Fantoni, E. Quercigh, Angela Badala, A.S. Vodopianov, P. Ostrowski, I. Cortés Maldonado, Taku Gunji, K. Watanabe, Joakim Nystrand, Ionut Cristian Arsene, M. C. S. Williams, Fatima Padilla, A. Dobrin, A. R. Reolon, G. Bruckner, R. Vernet, M. Heinz, Lee Stuart Barnby, L. Massacrier, Toru Sugitate, Markus Fasel, S. Serci, D. Miśkowiec, Giuseppe Simonetti, D. P. Kikola, V.A. Polyakov, Alexandre Alarcon Do Passo Suaide, Michele Floris, Arturo Tauro, Ralf Peter Averbeck, F.F. Guber, Zubayer Ahammed, Giacomo Vito Margagliotti, A. V. Kazantsev, Volker Lindenstruth, N. Miftakhov, C. Lazzeroni, S. Kalcher, C. Garabatos, Dominik Fehlker, Federico Cindolo, Xavier Bernard Lopez, Jaroslav Bielcik, Marco Monteno, S. Chattopadhyay, A. Zenin, K. Ma, L. Šándor, Jogender Saini, David Dobrigkeit Chinellato, M. G. Poghosyan, F. Navach, Anand Kumar Dubey, Y. Kucheriaev, D. Emschermann, S. Aguilar Salazar, Romualdo Santoro, Kyrre Skjerdal, A. Ramírez Reyes, K. Antipin, V. Dobretsov, Sergey Filchagin, Paolo Camerini, Sergey Voloshin, M. Kim, David Olle Rickard Silvermyr, Gilda Scioli, Barbara Guerzoni, C. Lal, H. Torii, Johan Alme, Luciano Ramello, R. López-Ramírez, H. Pereira, P. Saturnini, M. R. Dutta Majumdar, P. Zelnicek, W. Sommer, Vladislav Manko, Pascal Dupieux, Andrea Dainese, Sergey Fokin, Anton Andronic, Tatjana Susa, Federico Antinori, A. Casanova Díaz, I. Kisel, A. Nedosekin, R. De Remigis, D. Soyk, J. D. Tapia Takaki, G. Laurenti, Bogdan Vulpescu, H. Gottschlag, D. S. Hwang, Boris Batyunya, Stefan Rossegger, Sergio Vergara, S. Böttger, J. Symons, H. González Santos, Kathrin Koch, K. Kozlov, Paolo Martinengo, S. Bose, J. De Groot, L. Riccati, Michele Caselle, P. Petrov, L. Benhabib, Gerardus Nooren, R. Panse, A. Wilk, Peter Zahariev Hristov, Y. Li, Alessandro Ferretti, S. Lu, G. Tsiledakis, Peter Christiansen, S. Román López, Andrew Ivanov, D. P. Mahapatra, Stefania Beole, Vladimir Peskov, Bikash Sinha, Melinda Siciliano, I. K. Yoo, J. P. Revol, Claudiu Cornel Schiaua, M. Mohisin Khan, N. Grion, A. Palaha, Navneet Kumar, I. Berceanu, Borge Svane Nielsen, Richa Gupta, L. Díaz, M. Hartig, I. E. Yushmanov, R. Wan, T. Alt, S. Sharma, Mitali Mondal, Chiara Oppedisano, B. H. Han, O. Villalobos Baillie, T. Peitzmann, R. A. Ricci, Sergey Nikulin, O. Vikhlyantsev, Ombretta Pinazza, E. Siddi, Hiroki Yokoyama, K. Polák, V. P. Kondratiev, C. Torcato de Matos, A. Soloviev, X. Cai, B. Hicks, T. Malkiewicz, Alexei Khanzadeev, Sandra Moretto, Andrea Danu, Y. Zoccarato, E. Montes, F. Prino, P. Ladron de Guevara, Guillaume Batigne, A. De Caro, Adam Ryszard Kisiel, Gaute Øvrebekk, P. Di Nezza, T. C. Awes, Kyoichiro Ozawa, N. Abel, H. Bøggild, G. Tejeda Muñoz, D. S. Kim, A. Charpy, M. Sano, Sona Pochybova, P. G. Innocenti, Anik Gupta, G. S. Pappalardo, H. Delagrange, T. Dobrowolski, Vikas Singhal, Antonino Zichichi, Andrey Vasiliev, Gennady Zinovjev, R. Akimoto, J. Bartke, Y. Wang, Christian Holm Christensen, G. Torralba, Enrico Scomparin, Hans Muller, D. Tlusty, J. Pluta, Andreas Petridis, Evgeny Ryabinkin, J. Kral, Hans Hjersing Dalsgaard, M. Spyropoulou-Stassinaki, C. Pastore, F. Lefèvre, E. Stenlund, C. Nygaard, J. Sarkamo, P. G. Kuijer, Costin Grigoras, Leonardo Milano, M. Oldenburg, Wladyslaw Henryk Trzaska, S. Rath, J. Munoz, R. A. Fini, F. Poggio, Angelo Rivetti, Petra Riedler, M. Venaruzzo, B. S. Chang, R. Bala, G. Steyn, G. Anelli, J. Lehnert, Marcelo Gameiro Munhoz, A. Belogianni, D. Mayani, Satyajit Jena, Valeria Muccifora, A. Vacchi, Mihaela Gheata, Henner Buesching, Min Jung Kweon, E. Stan, R.J.M. Snellings, Tomoya Tsuji, P. L.M. Podesta Lerma, A. Silenzi, Alexander Mamonov, A. Pepato, Sanjib Muhuri, P. Roy, A. Glenn, A. Michalon, Dieter Røhrich, L. Molnar, Evgeny Karpechev, A. Anzo, Sébastien Gadrat, G. Aglieri Rinella, K. Shtejer, Vladimir Kaplin, L. Luquin, H. Snow, F. Staley, Tome Anticic, D. Antończyk, Christoph Blume, D. Semenov, Myunggeun Song, Eugen Mudnic, P. Rosinský, Jorn Henning Putschke, R. Kour, D. W. Kim, M. Zynovyev, H. León Vargas, D. Truesdale, J. Hamblen, F. Posa, G. Nazarov, Y. Vinogradov, L. Valencia Palomo, S. Zhou, Marek Kowalski, J. Castillo Castellanos, Y. Sibiriak, A. A. Rademakers, Altaf Ahmad, Andrzej Rybicki, R. Kupczak, M. A. Lisa, A. De Falco, R. Smakal, R. Salgueiro Domingues da Silva, Ciprian Mihai Mitu, Basanta Kumar Nandi, Svein Lindal, A.G. Fedunov, David H. Evans, E. Almaráz Aviña, Andrei Ionut Herghelegiu, S.A. Sadovsky, G. M. Urciuoli, M. Heide, A. Nyiri, Jurgen Schukraft, Magnus Mager, Christian Lippmann, Christian Claude Kuhn, Kristin Fanebust Hetland, Svetlana Kushpil, P. Mendez Lorenzo, W. J. Park, H. Appelshäuser, Ketil Røed, P. Cerello, A. Blanc, Sergey Nikolaev, P. Mereu, Pietro Antonioli, Luisa Cifarelli, M. Campbell, Steffen Schreiner, A. Frolov, W. Peryt, F. Rettig, F. Nendaz, Cristina Terrevoli, P. Vande Vyvre, A. Harutyunyan, M. Masetti, C. Søgaard, H. León, A. Hiei, Eugenio Scapparone, Julien Faivre, I. León Monzón, Konrad Tywoniuk, E. Nappi, I. Rashevskaya, Djuvsland, V. Demanov, H. K. Soltveit, L. Bimbot, J. Peschek, Rene Brun, Enrique Calvo, L. H. González-Trueba, H. Schindler, K. Okada, C. Cicalo, T. V. Moukhanova, Y. Schutz, Mikhail Ippolitov, Kai Schweda, Igor Pshenichnov, I. Das, Maria Vasileiou, A. M. Rossi, V. Paticchio, Jovan Milosevic, Alexandru Bercuci, A. Piccotti, B. Pommeresch, M. Estienne, M. R. Cosentino, Alberto Baldisseri, Guy Paic, M. Nicassio, Kalliopi Kanaki, Roberto Divia, G. Cara Romeo, Yvonne Chiara Pachmayer, A. Ochirov, Diego Stocco, B. S. Nilsen, Mohd Danish Azmi, Peter Malzacher, Dirk Hutter, M. Rodríguez Cahuantzi, M. Lenhardt, T.A. Pocheptsov, Sevil Salur, G. Dellacasa, S. Kniege, C. W. Son, C. Bombonati, M. López Noriega, P. A. Scott, Agneta Oskarsson, Branislav Sitar, Janusz Oleniacz, Y. Berdnikov, Ana Vargas, I. Maldonado Cervantes, Elena Bruna, Catia Petta, Kjetil Ullaland, N. De Marco, E. Belmont-Moreno, Francesco Riggi, Panagiota Foka, Lennart Osterman, Werner Riegler, Jennifer Lynn Klay, J. L. Charvet, K. Schossmaier, V. Fekete, Klaus Johannes Reygers, S. Rousseau, Alexander Akindinov, P. Gros, R. Santo, A. Enokizono, V. Canoa Roman, T. Aronsson, Nikolai Smirnov, R. Stock, Raphael Noel Tieulent, Sedat Altinpinar, T. K. Nayak, Alla Maevskaya, C.J. Schmidt, S. Schuchmann, Y. N. Gorbunov, Vladimir Ivanov, An. Zalite, G. L. Usai, C. Guerra, B.V. Zagreev, R. Romita, Petr Zavada, Evgeny Zabrodin, R. P. Scharenberg, Markku Oinonen, S. Kox, G. Hamar, D. Perrino, J. H. Kim, L. Leistam, Yasuo Miake, S. Evrard, C. Klein-Bösing, Davide Caffarri, A. Ortiz Velasquez, Stefano Bagnasco, Airton Deppman, Giuseppe Giraudo, A. Arend, Sylvain Chapeland, Rinaldo Rui, M. Fusco Girard, Boris Wagner, Chiara Bianchin, J. G. Contreras, Stefano Piano, A. Nyatha, S. Dash, Vardanush Papikyan, R. Alfaro Molina, Dagmar Adamová, Marian Krivda, Grzegorz Andrzej Wilk, T. Samanta, Matthias Richter, G. Herrera Corral, Lawrence Pinsky, Jochen Klein, A. Szostak, Sergey Kiselev, Andreas Morsch, A. Palmeri, M. Bregant, Uwe Westerhoff, A. Pesci, T. Virgili, H. Yang, J. W. Harris, Yu.V. Zanevsky, Mauro Gallio, A. Lozea Feijo Soares, Silvia Masciocchi, Kenta Shigaki, Michael Linus Knichel, Kilian Eberhard Schwarz, Cai Xu, E. Camacho, M. Bogolyubsky, Alexander Kurepin, Marie Germain, Leonid Serkin, Ulrich Michael Frankenfeld, Alexandr Tumkin, F. Chuman, M. Bondila, E. Tsilis, M. Kliemant, V. Basmanov, Raul Arteche Diaz, V. Kushpil, V. Grigoriev, J. Gebelein, Y. Corrales Morales, S. Sano, Evgeny Kryshen, S. Di Liberto, Toralf Bernhard Skaali, Marek Chojnacki, S. H. Kim, Laurent Bernard Aphecetche, G. Martínez García, Herve Borel, Roberto Preghenella, B. Pastirčák, P. González-Zamora, I. Ilkiv, Bruno Alessandro, E. Serradilla, Z. Buthelezi, H. Caines, Sudhir Raniwala, M. Dialinas, Tatiana Karavicheva, Y. Le Bornec, Bjarte Kileng, A. Marzari Chiesa, Peter Graham Jones, A. Musso, Smbat Grigoryan, Rainer Martin Schicker, P. Stolpovsky, Andrzej Deloff, D. Felea, Andre Augustinus, C. García Trapaga, Haaland, L. Jancurová, J.A. Mares, Matevz Tadel, D. Derkach, Mads Stormo Nilsson, Paraskevi Ganoti, M. van Leeuwen, Hyungsuk Son, J. Seo, S. K. Pal, Dmitry Mal'kevich, J. R. Lutz, Rainer Arno Ernst Renfordt, Petr Nomokonov, Juyeon Yi, Udo Kebschull, Rashmi Raniwala, Claude Andre Pruneau, Roberto Barbera, Zhongbao Yin, R. Grajcarek, Bruce Becker, S. Huber, R. Ichou, Fernando Scarlassara, Rajeev Singh, B. Fenton-Olsen, F. Orsini, Ana Maria Marin, Dayong Wang, D. Perini, and A. Devaux

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Tevatron, Particle accelerator, Bose–Einstein correlations, 01 natural sciences, law.invention, Nuclear physics, Pion, law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

We report on the measurement of two-pion correlation functions from pp collisions at root s = 900 GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the Hanbury Brown-Twiss radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear collisions. Conversely, the strong decrease of the radius with increasing transverse momentum, as observed at the Relativistic Heavy Ion Collider and at Tevatron, is not manifest in our data.

Published
2010

40. Λ−pfemtoscopy in collisions ofAr+KClat1.76A GeV

Author

Andrey Reshetin, V. Metag, M. Lorenz, Yvonne Chiara Pachmayer, M. Destefanis, J. A. Garzón, M. Jurkovic, R. Holzmann, J. Markert, R. Trebacz, A. Dybczak, Roman Gernhäuser, A. Kugler, P. Tlusty, Kirill Lapidus, Yiannis Parpottas, F.F. Guber, O. Pechenova, Alexey Kurepin, M. Böhmer, A. Mangiarotti, D. González-Díaz, J. S. Díaz, B. Michalska, A. M. Schmah, J. Pietraszko, B. Sailer, D. Kirschner, C. Wendisch, M. Sudol, B. Ramstein, S. Lang, J. L. Boyard, S. Yurevich, Witold Przygoda, M. Roy-Stephan, T. Hennino, C. Gilardi, O. V. Fateev, Jacek Tomasz Otwinowski, V. Pechenov, Marek Palka, M. Wisniowski, T. Galatyuk, B. W. Kolb, A. Blanco, P. Fonte, I. Koenig, A. Ivashkin, R. Kotte, B. Spruck, P. Zhou, M.B. Golubeva, L. Maier, Laura Fabbietti, S. P. Chernenko, J. S. Lange, A. Tarantola, M. Traxler, I. Iori, J. Friese, T. Wojcik, J. Michel, E. Morinière, Yu. G. Sobolev, H. Ströbele, B. Kämpfer, R. Bassini, J. Wüstenfeld, C. Müntz, P. Zumbruch, E. Castro, P. Salabura, V. Wagner, W. Koenig, Alexander Belyaev, W. Kühn, Jehad Mousa, Ana M. Gil, Filip Krizek, Tatiana Karavicheva, G. Agakishiev, Yu.V. Zanevsky, T. Eberl, L. Naumann, M. Weber, Paolo Finocchiaro, D. Belver, A. Balanda, F. Dohrmann, C. Sturm, P. Cabanelas, L. Lopes, R. Krücken, D. K. Mishra, J. Stroth, A. Sadovsky, T. Liu, S. Spataro, I. Fröhlich, T. Christ, A. Rustamov, Kalliopi Kanaki, H. Tsertos, Peter Braun-Munzinger, and K. Teilab

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Collision system, Radius, Lambda, 01 natural sciences, Nuclear physics, 0103 physical sciences, Experimental correlation, Nuclear Experiment, 010306 general physics, Beam energy, Energy (signal processing)
Abstract

Results on $\ensuremath{\Lambda}p$ femtoscopy are reported at the lowest energy so far. At a beam energy of $1.76A$ GeV, the reaction $\mathrm{Ar}+\mathrm{KCl}$ was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\ensuremath{\Lambda}$ sample was collected, allowing for the investigation of $\ensuremath{\Lambda}p$ correlations at low relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent of the $\ensuremath{\Lambda}p$ emission source. The $\ensuremath{\Lambda}p$ source radius is found to be slightly smaller than the $\mathit{pp}$ correlation radius for a similar collision system. The present $\ensuremath{\Lambda}p$ radius is significantly smaller than that found for $\mathrm{Au}+\mathrm{Au}/\mathrm{Pb}+\mathrm{Pb}$ collisions in the AGS, SPS, and RHIC energy domains but larger than that observed for electroproduction from He. Taking into account all available data, we find the $\ensuremath{\Lambda}p$ source radius to increase almost linearly with the number of participants to the power of one-third.

Published
2010

41. Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio toQ2=8.5 GeV2

Author

Y. Matulenko, Ronald Gilman, S. A. Wood, M. Veilleux, L. Solovyev, H. Mkrtchyan, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, M. Meziane, John Arrington, M. Commisso, C. E. Keppel, Z. Ye, R. Subedi, A. Ahmidouch, F. R. Wesselmann, Emil Frlez, M. H. Shabestari, D. J. Margaziotis, Y. Zhang, Fatiha Benmokhtar, V. Kravtsov, I. Albayrak, Nuruzzaman, E. Tomasi-Gustafsson, Y. Prok, L. Pentchev, A. Asaturyan, L. Smykov, G. R. Smith, T. Horn, Bogdan Wojtsekhowski, S. Covrig, Ronald Ransome, W. Pierce, X. Zhang, S. P. Chernenko, S. Frullani, Dipangkar Dutta, D. S. Razin, Andrey Vasiliev, L. Bimbot, A. Marsh, James A. Miller, P. E. Reimer, P. Solvignon, E. Christy, D. G. Meekins, J. Huang, E. J. Brash, C. Butuceanu, P. M. King, J. Reinhold, A. Davidenko, I. Sitnik, H. Baghdasaryan, Amrendra Narayan, Simon Širca, G. M. Huber, F. Garibaldi, D. Gaskell, James Maxwell, W. U. Boeglin, William Bertozzi, Y. Goncharenko, Y. Li, C. F. Perdrisat, A. J. R. Puckett, David Hamilton, B. Moffit, X. Zheng, G. Mbianda, Shalev Gilad, J. C. Cornejo, D. Kirillov, A. Daniel, M. Khandaker, K. A. Aniol, G. Kumbartzki, W. Luo, J. Mulholland, H. C. Fenker, Yu.M. Mel'nik, L. Zhu, O. Rondon, A. Shahinyan, Donal Day, O. Moreno, Yu.V. Zanevsky, V. Mamyan, K. Shestermanov, Rolf Ent, S. Danagoulian, P. Bosted, S. Dhamija, B. Hu, Michael Kohl, S. Nedev, P. Carter, V. A. Punjabi, W. Hinton, E. Piasetzky, K. Hafidi, and A. Mkrtchyan

Subjects
Physics, Quark, Particle physics, Proton, Nuclear Theory, Hadron, Momentum transfer, Strong interaction, General Physics and Astronomy, Elementary particle, Nuclear physics, Recoil, Nuclear Experiment, Nucleon
Abstract

Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon’s quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which GEp is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.

Published
2010

42. ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

Author

B. Spruck, I. Iori, J. Friese, T. Wojcik, C. Sturm, J. L. Boyard, Tatiana Karavicheva, V. Pechenov, O. V. Fateev, P. Cabanelas, P. Zhou, W. Kühn, Witold Przygoda, S. Spataro, D. Belver, J. S. Lange, T. Perez Cavalcanti, R. Holzmann, J. Markert, E. Schwab, I. Fröhlich, M. Roy-Stephan, A. Sadovsky, S. Yurevich, B. Kämpfer, A.P. Ierusalimov, P. Zumbruch, E. Castro, M. Traxler, Kalliopi Kanaki, H. Tsertos, T. Galatyuk, B. Michalska, Piotr Salabura, Marek Palka, M. Wisniowski, Peter Braun-Munzinger, L. Maier, Yu.V. Zanevsky, L. Lopes, T. Christ, A. Rustamov, W. Koenig, V. Metag, Yiannis Parpottas, Laura Fabbietti, Jehad Mousa, Ana M. Gil, Alexey Kurepin, D. González-Díaz, J. S. Díaz, R. Krücken, M.B. Golubeva, Andrzej Bałanda, D. Kirschner, M. Lorenz, O. Pechenova, H. Ströbele, Filip Krizek, B. Ramstein, J. Pietraszko, V. Wagner, K. Teilab, E. Morinière, Yu. G. Sobolev, Andrey Reshetin, C. Müntz, Yvonne Chiara Pachmayer, D. K. Mishra, J. Stroth, Alexander Belyaev, T. Liu, M. Sudol, M. Destefanis, B. Bannier, P. Tlusty, Kirill Lapidus, G. Agakishiev, T. Eberl, Paolo Finocchiaro, A. M. Schmah, S. Lang, B. W. Kolb, A. Dybczak, I. Koenig, S. P. Chernenko, J. Michel, R. Bassini, J. Wüstenfeld, F. Dohrmann, L. Naumann, M. Weber, B. Sailer, T. Heinz, A. Tarantola, F.F. Guber, M. Böhmer, A. Mangiarotti, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, A. Blanco, P. Fonte, A. Ivashkin, R. Kotte, M. Heilmann, Roman Gernhäuser, A. Kugler, J. A. Garzón, M. Jurkovic, and R. Trebacz

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson production, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, 7. Clean energy
Abstract

We gratefully acknowledge the useful discussions with H. Oeschler and K. Redlich. In particular we thank K. Redlich for providing the calculations by the statistical model. The HADES Collaboration gratefully acknowledges support from the following: BMBF Grants 06TM970I, 06GI146I, 06F-140, and 06DR135 (Germany); GSI (TMFR1, GI/ME3, OF/STR); Excellence Cluster of Universe (Germany); Grants GA AS CR IAA100480803 and MSMT LC 07050 (Czech Republic); Grant KBN 5P03B 140 20 (Poland); INFN (Italy); CNRS/IN2P3 (France);GrantsMCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain); Grant UCY-10.3.11.12 (Cyprus); INTAS Grant 06- 1000012-8861; and EU Contract RII3-CT-2004-506078.

Published
2009

43. New developments and investigations of PSD at JINR, LHE

Author

S. P. Chernenko, S.E. Vasilev, L. Smykov, A.B. Ivanov, T. Netusil, Yu.V. Zanevsky, S. A. Movchan, and G.A. Cheremukhina

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutron, macromolecular substances, Instrumentation, Ion
Abstract

The main parameters and test results of several position-sensitive detectors for investigations by means of soft X-rays, slow neutrons and ions are presented.

Published
1991

44. Dielectron Production inC12+C12Collisions at2A GeVwith the HADES Spectrometer

Author

B. W. Kolb, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, D. Magestro, R. Coniglione, A. Ivashkin, E. Schwab, A. Sadovsky, G. Bellia, R. Kotte, A.P. Ierusalimov, F. Dohrmann, Kalliopi Kanaki, J. Friese, T. Wojcik, T. Christ, A. Rustamov, P. Cabanelas, J. A. Garzón, M. Sudol, H. Tsertos, Tatiana Karavicheva, M. Jurkovic, O. V. Fateev, Alexey Kurepin, D. González-Díaz, J. S. Díaz, C. Agodi, M. Jaskula, W. Kühn, M. Suk, Peter Braun-Munzinger, Alberica Toia, Karl Zeitelhack, C. Sturm, C. Schröder, J. L. Boyard, P. Zumbruch, Yu.V. Zanevsky, Andrey Reshetin, H. J. Körner, B. Spruck, D. Vassiliev, W. Schön, V. Pechenov, H. Ströbele, A. Vazquez, T. Eberl, Paolo Finocchiaro, V. T. Smolyankin, M. Kagarlis, Adam Malarz, B. Sailer, A. Taranenko, V. Wagner, C. Fernandez, W. Koenig, I. Iori, Wolfgang Enghardt, Jehad Mousa, Piotr Salabura, M. Ploskon, Witold Przygoda, T. Pérez, E. Lins, A. Nekhaev, H. Alvarez-Pol, S. Lange, Laura Fabbietti, C. Müntz, R.S. Simon, A. Balanda, M. Roy-Stephan, M. Sánchez, D. Zovinec, Paul Kienle, V. Pospíšil, M.B. Golubeva, L. Kidon, Luigi Cosentino, G. Agakichiev, Paolo Sapienza, R. Holzmann, J. Markert, P. Tlusty, M. Traxler, B. Kämpfer, A. M. Schmah, E. Grosse, I. Duran, S. Hlavac, Yvonne Chiara Pachmayer, B. Fuentes, H. Schön, S. Lang, J. Pietraszko, Paolo Piattelli, M. Münch, J. Lehnert, W. Prokopowicz, H. Bokemeyer, B. Ramstein, Jaroslav Bielcik, R. Krücken, Władysław Waluś, S. Spataro, I. Fröhlich, R. Pleskac, J. Stroth, I. Koenig, M. Wiśniowski, J. Homolka, L. Naumann, Jan Novotny, L. Smykov, J. Ritman, S. P. Chernenko, J. Wüstenfeld, D. Bertini, F.F. Guber, M. Böhmer, C. Garabatos, C. Maiolino, Reinhard Kulessa, Roman Gernhäuser, A. Kugler, M. Kajetanowicz, A. Kastenmüller, and V. Metag

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, General Physics and Astronomy, Electron, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Particle decay, Pair production, Orders of magnitude (time), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The invariant-mass spectrum of e{sup +}e{sup -} pairs produced in {sup 12}C+{sup 12}C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the {pi}{sup 0}-Dalitz to the {rho}/{omega} invariant-mass region. Dalitz decays of {pi}{sup 0} and {eta} account for all the yield up to 0.15 GeV/c{sup 2}, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Published
2007

45. Dielectron production in C+C and p+p collisions with HADES

Author

R. Gernhóuser, H. Ströbele, B. Kämpfer, Peter Senger, Andrey Reshetin, V. Wagner, B. Spruck, T. Hennino, C. Gilardi, P. Zumbruch, E. Castro, B. Ramstein, P. Fonte, A. Ivashkin, M. Sudol, R. Pleskac, J. Marín, R. Kotte, G. Bellia, M. Heilmann, M. Destefanis, A.P. Ierusalimov, F. Dohrmann, I. Veretenkin, J. A. Garzón, I. Iori, R.S. Simon, M. Jurkovic, R. Holzmann, P. Tlusty, K. Teilab, D. González-Díaz, J. S. Díaz, J. Mousa, T. Christ, A. Rustamov, J. Markert, R. Trȩbacz, Yu.V. Zanevsky, G. Agakishiev, Paolo Finocchiaro, Joachim Stroth, M. Roy-Stephan, W. Koenig, A. Blanco, Tatiana Karavicheva, A. M. Schmah, Ch. Hadjivasiliou, R. Krücken, Wolfgang Kuhn, L. Lopez, Y. C. Pachmayer, S. Spataro, J. Lamas-Valverde, Thomas Eberl, I. Duran, S. Lang, A. B. Kurepin, M. Traxler, Fedor Guber, R. Novotny, J. Pietraszko, M. Böhmer, A. Mangiarotti, K.A. Shileev, J. L. Boyard, Alexander Belyaev, S. Lange, M. B. Golubeva, Marek Palka, I. Frhölich, B. Sailer, I. Koenig, E. Morinière, A. Balanda, L. Naumann, B. W. Kolb, J. Otwinowski, Laura Fabbietti, Eckart Grosse, C. Müntz, A. Kugler, M. Wiśniowski, H. Wen, S. P. Chernenko, Volker Metag, M. Münch, Kalliopi Kanaki, H. Tsertos, D. Belver, D. Kirschner, O. V. Fateev, C. Agodi, J. Wüstenfeld, V. Pospíšil, Peter Braun-Munzinger, C. Sturm, A. Sadovsky, T. Galatyuk, Piotr Salabura, T. Pérez, V. Pechenov, D. Mishra, Filip Krizek, J. Friese, T. Wojcik, Witold Przygoda, B. Michalska, and P. Cabanelas

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Rho meson, Spectrometer, Hadron, Nuclear Theory, Astronomy and Astrophysics, HEAVY-ION COLLISIONS, Nuclear matter, Dilepton production, Atomic and Molecular Physics, and Optics, Energies, Nuclear physics, Pion, heavy ion collisions, dilepton production, RING RECOGNITION, RHO-MESON, ρ-meson, Heavy ion collisions, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment, Ring Recognition
Abstract

9 pages.-- HADES Collaboration: et al., The High Acceptance Di-Electron Spectrometer HADES has been constructed at the SIS accelerator (GSI Darmstadt) to investigate electron-positron pairs produced in proton, pion and heavy ion induced reactions. The main goal of these studies is to explore properties of hadrons in nuclear matter. The apparatus and the experimental results from C+C at 2.0 AGeV and 1.0 AGeV and p+p at 2.2 GeV compared with Monte-Carlo events from a generator based on known cross-sections and branching ratios are presented.

Published
2007

46. Transition Radiation Spectra of Electrons from 1 to 10 GeV/c in Regular and Irregular Radiators

Author

Peter Braun-Munzinger, I. Rusanov, Mihai Petrovici, Taku Gunji, Yu. Panebratsev, Rainer Martin Schicker, S. Freuen, V. Catanescu, Christian Lippmann, Yu.V. Zanevsky, Andres Sandoval, Oliver Busch, V. I. Yurevich, N. Herrmann, H. K. Soltveit, D. Bucher, Johanna Stachel, Raphaelle Marie Bailhache, P. Christakoglou, Andreas Petridis, Y. Morino, H. Gottschlag, M. Hoppe, Volker Lindenstruth, M. Vassiliou, S. P. Chernenko, C. Baumann, Hideki Hamagaki, B. Vulpescu, H. Appelshäuser, Anton Andronic, O. V. Fateev, A. Wilk, Shinya Saito, H. Stelzer, Johannes Peter Wessels, and C. Garabatos

Subjects
Physics, Nuclear and High Energy Physics, Photon, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Other Fields of Physics, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), Electromagnetic radiation, Particle detector, Spectral line, Momentum, Nuclear physics, Transition radiation detector, Transition radiation, Atomic physics, Instrumentation
Abstract

We present measurements of the spectral distribution of transition radiation generated by electrons of momentum 1 to 10 GeV/c in different radiator types. We investigate periodic foil radiators and irregular foam and fiber materials. The transition radiation photons are detected by prototypes of the drift chambers to be used in the Transition Radiation Detector (TRD) of the ALICE experiment at CERN, which are filled with a Xe, CO2 (15 %) mixture. The measurements are compared to simulations in order to enhance the quantitative understanding of transition radiation production, in particular the momentum dependence of the transition radiation yield., Comment: 18 pages, 15 figures, submitted to Nucl. Instr. Meth. Phys. Res. A

Published
2005
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47. Azimuthal Anisotropy and Correlations at Large Transverse Momenta inp+pandAu+AuCollisions atsNN=200 GeV

Author

Lee Stuart Barnby, P. Seyboth, J. C. Dunlop, A. Urkinbaev, Zubayer Ahammed, M. J. LeVine, T. Dietel, Julien Faivre, T. J. Humanic, J. Speltz, M. R. Dutta Mazumdar, Mirko Planinic, A. V. Brandin, S. Chattopdhyay, I.A. Savin, N. T. Porile, O. V. Rogachevskiy, T. W. Henry, Michal Sumbera, A. A. P. Suaide, G. Renault, R. Varma, G. Eppley, S. K. Badyal, H. Bichsel, Yu A. Matulenko, G. Odyniec, W. A. Love, N. Xu, P. Filip, D. D. Koetke, E. Sugarbaker, H. Z. Huang, A. Stolpovsky, S. Vokal, B. Stringfellow, S. E. Vigdor, Y. Zoulkarneeva, M. Potekhin, J. Pluta, A. Billmeier, E. M. Kislov, G. D. Westfall, Christian Claude Kuhn, L. Kotchenda, S. Hepplemann, F. Meissner, C. Suire, J. G. Cramer, Y. Bai, L. S. Schroeder, V. V. Belaga, Malgorzata Anna Janik, M. Kramer, T. S. McShane, David Lynn, R. S. Longacre, P. Sorensen, S. V. Razin, V. S. Bhatia, J. Kiryluk, J. N. Marx, Madan M. Aggarwal, Fuqiang Wang, Y. P. Viyogi, Guo-Liang Ma, K. Schweda, V. Ghazikhanian, J. Castillo, Debasish Das, Raghunath Sahoo, M. Oldenburg, R. E. Tribble, D. A. Morozov, L. Gaudichet, S. W. Wissink, R. L. Ray, H. Zhang, J. C. Webb, M. A.C. Lamont, Gerald W Hoffmann, J. Engelage, M. Shao, G. Van Buren, Peter Graham Jones, E. Potrebenikova, A. Ridiger, Thorsten Sven Kollegger, V. I. Yurevich, Z. P. Zhang, A. S. Hirsch, J. L. Romero, A. Hamed, G. Igo, Jay Roberts, John N. Wood, J. H. Thomas, I. Sakrejda, J. G. Ma, V. A. Nikitin, K. Fomenko, V. Y. Khodyrev, F. Laue, A. Szanto de Toledo, Frank Simon, L. Martin, G. Wang, C. L. Kunz, L. K. Mangotra, P. Kravtsov, R. K. Kutuev, P. S. Sazhin, R. Fatemi, C. F. Moore, E. Finch, Premomoy Ghosh, J. M. Landgraf, V. Fine, C. Perkins, K. E. Shestermanov, Y. Panebratsev, D. Grosnick, S. M. Dogra, G. Rai, R. Manweiler, L. Didenko, J. Takahashi, J. Putschke, T. Ljubicic, Vitaly Okorokov, J. E. Draper, C. J. McClain, T. W. Ludlam, K. Krueger, Q. J. Liu, T. Pawlak, C. A. Whitten, J. W. Watson, Jeffrey G. Reid, T. Peitzmann, M. Strikhanov, H. Caines, Sudhir Raniwala, Bernd Surrow, J. M. Nelson, Z. Z. Xu, R. Picha, P.A. Zolnierczuk, J. P. Coffin, B. V.K.S. Potukuchi, B. Erazmus, A. M. Poskanzer, Y. Li, S. M. Guertin, D. P. Mahapatra, Yu Chen, S. R. Klein, G. S. Averichev, S. Lange, B. D. Anderson, Pawan Kumar Netrakanti, S. J. Lindenbaum, G. Sood, Christina Markert, J. Sandweiss, Z. Liu, A. K. Dubey, Souvik Das, R. Witt, Anik Gupta, R. V. Cadman, Jianhong Wu, Frank Jm Geurts, A. Ogawa, H. F. Chen, Shengli Huang, W. R. Edwards, J. Berger, W. Peryt, S. S. Shimanskiy, T. Tarnowsky, A. M. Vander Molen, Vladimir Petrov, P. Szarwas, E. Hjort, D. Cebra, C. A. Gagliardi, Andre Mischke, O. Barannikova, D. L. Olson, Anju Bhasin, M. Cherney, C-Q. Li, M. L. Miller, B. E. Bonner, Gregory Rakness, O. D. Tsai, M. Estienne, Z. Chajecki, J. W. Harris, Yu.V. Zanevsky, C. O. Blyth, W. J. Llope, S. Bharadwaj, Thomas Michael Cormier, V. B. Dunin, Yu Melnick, R. P. Scharenberg, O. G. Grebenyuk, S. Timoshenko, J. Carroll, D. Thein, J. Fedorisin, W. T. Waggoner, X. L. Wang, B. K. Srivastava, I. M. Vasilevski, S. K. Nayak, A. Rose, R. N. Singaraju, H. S. Matis, B. I. Bezverkhny, A. A. Derevschikov, A. P. Meschanin, R. Wells, S. Margetis, J. Gans, Marcelo Gameiro Munhoz, D. J. Prindle, M. Kopytine, O. A. Grachov, Yaguo Wang, Boris Hippolyte, M. van Leeuwen, X. Dong, F. Retiere, J. Fu, W. Q. Shen, M. Tokarev, W. Shao, H. M. Spinka, H. Long, M. A. Lisa, D. G. Underwood, M. S. Ganti, W. J. Dong, J. Porter, S. K. Pal, A. Bravar, N. G. Minaev, Manish Sharma, K. Kang, Adam Ryszard Kisiel, Y. P. Lu, N. Schmitz, Joseph Adams, E. Shahaliev, T. D. S. Stanislaus, V. Perevoztchikov, K. Filimonov, E. W. Hughes, E. Yamamoto, W. W. Jacobs, R.J.M. Snellings, H. J. Crawford, C. Mironov, Sevil Salur, E. G. Judd, T. J. Hallman, J. Cheng, T. J. M. Symons, H. H. Wieman, A. N. Zubarev, E. P. Sichtermann, D. Magestro, J. Balewski, S. C. Phatak, Rashmi Raniwala, Sergey Panitkin, J. Lauret, A. Tai, A. Lebedev, J. Amonett, Claude Andre Pruneau, M. M. de Moura, G. Skoro, Yinina Ma, J. Klay, T. Ullrich, Morton Kaplan, R. Zoulkarneev, V. Emelianov, A. K. Bhati, D. Keane, A. Kumar, F. Du, Y. Fisyak, Nikolai Smirnov, R. Stock, M. Vznuzdaev, X. Z. Cai, Sergey Voloshin, J. Mitchell, L. G. Efimov, P. Yepes, V. Eckardt, L. V. Nogach, S. Kabana, P. Fachini, T. K. Nayak, K. J. Foley, V. I. Kravtsov, L. Ruan, R. Lednicky, L. Molnar, Renaud Vernet, J. Baudot, S. Lehocka, A. H. Tang, H. Ward, J. E. Gonzalez, Bedangadas Mohanty, M. Botje, A. Stadnik, L. C. Bland, Y. Guo, M. Lopez-Noriega, M. Bystersky, Peter Martin Jacobs, A. Wetzler, A. A. Kuznetsov, S. B. Nurushev, Z. Milosevich, L. Liu, Olivier Ravel, M. Calderon De La Barca Sanchez, S. Mahajan, Q. Li, M. Heinz, J. Ulery, H. G. Ritter, C. Roy, R. Bellwied, A. Klyachko, P. Chaloupka, Z. J. Xu, S. Trentalange, A. Chikanian, D. K. Mishra, A. Boucham, D. Arkhipkin, S. Bekele, A. Ishihara, H. Jiang, Basanta Kumar Nandi, W. Christie, A. I. Kulikov, W. M. Zhang, Andrey Vasiliev, Janet Elizabeth Seger, D. Reichhold, A. I. Pavlinov, F. Liu, T. D. Gutierrez, D. Hardtke, R. D. Majka, J. Sowinski, Z. M. Wang, and J. Schambach

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Elliptic flow, General Physics and Astronomy, 01 natural sciences, Spectral line, Charged particle, Azimuth, Transverse plane, 0103 physical sciences, Atomic physics, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Jet quenching, Anisotropy
Abstract

Results on high transverse momentum charged particle emission with respect to the reaction plane are presented for Au + Au collisions at square root s(NN)=200 GeV. Two- and four-particle correlations results are presented as well as a comparison of azimuthal correlations in Au + Au collisions to those in p + p at the same energy. The elliptic anisotropy v(2) is found to reach its maximum at p(t) approximately 3 GeV/c, then decrease slowly and remain significant up to p(t) approximately 7-10 GeV/c. Stronger suppression is found in the back-to-back high-p(t) particle correlations for particles emitted out of plane compared to those emitted in plane. The centrality dependence of v(2) at intermediate p(t) is compared to simple models based on jet quenching.

Published
2004

48. Test results of the parallax-free X-ray area detector SD-1000 in the diffractometer CARD-7

Author

O. V. Fateev, Yu.V. Zanevsky, S. P. Chernenko, M. E. Andrianova, S.N. Sulianov, D.M. Kheiker, and G.A. Cheremukhina

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Detector, Solid angle, X-ray, Detective quantum efficiency, Optics, Area detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, business, Parallax, Instrumentation, Intensity (heat transfer), Diffractometer
Abstract

A parallax-free X-ray area detector with a spherical Be-window has been tested in a diffractometer. The detector provides a DQE of ∼80% (8–17 keV), a parallax-free solid angle of 50°, and accuracies of 1% for the intensity and of 0.025° for the angle.

Published
1995

49. Parallax-free X-ray area detector with high spatial resolution

Author

S.E. Vasiliev, M. E. Andrianova, S. P. Chernenko, O. V. Fateev, G.A. Cheremukhina, Yu.V. Zanevsky, L. Smykov, S.N. Sulianov, D.M. Kheiker, and D.E. Donets

Subjects
Nuclear and High Energy Physics, Materials science, business.industry, Pixel array, Detector, X-ray, Atomic and Molecular Physics, and Optics, Optics, Liquid crystal, Area detector, High spatial resolution, Parallax, business, Diffractometer
Abstract

The new parallax-free X-ray 2D detector (SD-1000) with the pixel array of 1024 × 1024 has been designed and tested. This detector is the basic element of the X-ray diffractometer which is constructed for the investigation of biological macromolecules, viruses, liquid crystals and powders. The first test results are presented.

Published
1995

50. X-ray detectors for structure investigations constructed at JINR

Author

D.M. Kheiker, O. V. Fateev, G.A. Cheremukhina, A. N. Popov, L. Smykov, S. P. Chernenko, Yu.V. Zanevsky, and S.E. Vasiliev

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Detector, X-ray detector, High resolution, High count rate, Optics, Software, Nuclear magnetic resonance, IBM PC compatible, Electronics, business, Instrumentation, Silicon microstrip detectors
Abstract

The performance characteristics of a few high resolution position-sensitive detectors constructed at JINR are presented. The detectors supplied with original software operate with an IBM PC/AT. One of these devices has been succesfully applied for protein molecule structure investigations and the other for studies of the structure-forming process during combustion. The preliminary parameters of the high count rate MWPC with parallel electronics and the testing results of the microstrip detector are given.

Published
1994

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