Study of dielectron production in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">C</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">C</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mn>1</mml:mn><mml:mspace width="0.2em" /><mml:mi>A</mml:mi><mml:mtext> </mml:mtext><mml:mtext>GeV</mml:mtext></mml:math>

Agakishiev, G.; Agodi, C.; Álvarez‐Pol, H.; Bałanda, A.; Bassini, R.; Bellia, G.; Belver, D.; Belyaev, A.; Blanco, A.; Böhmer, M.; Bortolotti, A.; Boyard, J. L.; Braun‐Munzinger, P.; Cabanelas, P.; Castro, E.; Chernenko, S.; Christ, T.; Destefanis, M.; Díaz, Julio Pérez; Dohrmann, F.; Dybczak, A.; Eberl, T.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Fonte, P.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzón, J. A.; Gernhäuser, R.; Gil, A.; Gilardi, C.; Golubeva, M.; González-Díaz, D.; Grosse, E.; Guber, F.; Heilmann, Manuel; Heinz, T.; Hennino, T.; Holzmann, R.; Ierusalimov, A.; Iori, I.; Ivashkin, A.; Jurković, M.; Kämpfer, B.; Kajetanowicz, M.; Kanaki, K.; Karavicheva, T.; Kirschner, D.; Köenig, I.; Koenig, W.; Kolb, B. W.; Kötte, R.; Kożuch, A.; Krása, A.; Křížek, F.; Krücken, R.; Kühn, W.; Куглер, А.; Kurepin, A.; Lamas-Valverde, J.; Lang, S.; Lange, J. S.; Lapidus, K.; Lopes, L.; Maier, L.; Mangiarotti, A.; Marin, J. C.; Markert, J.; Metag, V.; Michalska, B.; Mishra, D.; Morinière, E.; Mousa, J.; Münch, M.; Müntz, C.; Naumann, L.; Novotny, R.; Otwinowski, J.; Pachmayer, Y.; Pałka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Cavalcanti, T. Pérez; Pietraszko, J.; Pleskač, R.; Pospíšil, V.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Roy‐Stéphan, M.; Rustamov, A.; Sadovsky, A.; Sailer, B.; Salabura, P.; Schmah, A.; Schröeder, C.; Schwab, E.; Simon, R. S.; Sobolev, Yu. G.; Spataro, S.; Spruck, B.; Ströbele, H.; Stroth, J.; Sturm, C.; Sudol, M.; Tarantola, A.; Teilab, K.; Tlustý, P.; Toia, A.; Traxler, M.; Trębacz, R.; Tsertos, H.; Veretenkin, I.; Wagner, V.; Weber, M.; Wen, Hao; Wiśniowski, M.; Wójcik, Tomasz; Wüstenfeld, J.; Yurevich, S.; Zanevsky, Y.; Zhou, Pei; Zumbruch, P.

doi:10.1016/j.physletb.2008.03.062

Cited by 92 publications

(65 citation statements)

References 28 publications

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“…A large di-electron "excess" over the hadronic cocktail was observed in C+C and Ca+Ca collisions. The excess of electron pairs in C+C collisions was investigated by the HADES experiment for beam energies of 1 and 2A G V [10,11]. It was demonstrated, that the yield measured by HADES and filtered with the DLS acceptance coincides with the DLS data for the collision system C+C at 1 A G V. Moreover, the beam energy dependence of the excess yield is found to be identical to the excitation function of pion production.…”

Section: Probing Compressed Nuclear Mater With Virtual Photonsmentioning

confidence: 99%

Investigating the microscopic properties of strongly interacting matter with HADES

Galatyuk¹,

Lorenz

2012

Open Physics

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Abstract:In the energy domain of 1-2 G V kinetic energy per nucleon, HADES has measured rare and penetrating probes in elementary and heavy ion collisions. Our results demonstrate that electron pair emission in C+C collisions can essentially be explained as a superposition of independent N+N collisions. HADES results on + − production in Ar+KCl collisions, however, show a strong enhancement of the dilepton yield relative to a reference spectrum obtained from elementary nucleon-nucleon reactions, signal the onset of medium effects beyond the superposition of individual N+N collisions. Intriguing results where also obtained from the reconstruction of hadrons with open and hidden strangeness. Analyses of the experimentally obtained hadronic yields measured in Ar+KCl allows to extract the chemical freeze-out conditions in the T -µ B phase diagram of strongly interacting matter. While the measured abundance of all reconstructed particles are well described assuming thermalization, the also reconstructed double strange baryon Ξ − appears about ten times more abundant than expected. This result will be discussed in the context of the exploration of the nuclear matter phase diagram in the region of finite density. Further investigations to search for significant medium effects, will be followed over the coming years with an upgraded HADES detector. PACS

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Section: Probing Compressed Nuclear Mater With Virtual Photonsmentioning

confidence: 99%

Investigating the microscopic properties of strongly interacting matter with HADES

Galatyuk¹,

Lorenz

2012

Open Physics

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“…As the former DLS experiment provided e + e − data for the p + p reaction at 2.09 GeV [13], we can make a direct comparison along the line already used to confront the DLS and HADES C + C data obtained at 1A GeV [10,17]. As the HADES geometrical acceptance is substantially broader than the DLS one such a comparison can be done by projecting the reconstructed HADES dielectron yields d 3 N/dM ee dP ⊥ dY through the DLS acceptance filter [17] (here P ⊥ and Y are the e + e − pair transverse momentum and rapidity, respectively).…”

Section: B Comparison With Dlsmentioning

confidence: 99%

“…In fact, because DLS applied to their p + p data additional cleaning cuts [13,18]-0.1 < M ee < 1.25 GeV/c 2 , P ⊥ < 1.2 GeV/c, 0.5 < Y < 1.7, and θ e > 21.5 • -an extrapolation of the HADES yield to rapidities above 1.9, as applied in Ref. [10], is not needed here. The result of this filtering procedure is shown in Fig.…”

Section: B Comparison With Dlsmentioning

confidence: 99%

“…The high acceptance dielectron spectrometer (HADES) experiment pursues a comprehensive program of dielectron emission studies in N + N [7,8], p + A [9], and A + A collisions [10][11][12]. Inclusive e + e − production in p + p and p + d reactions has formerly been studied in the range of [1][2][3][4][5] GeV by the dilepton spectrometer (DLS) experiment at the Bevalac facility [13] and has more recently been studied by the HADES experiment at 1.25 [7] and 3.5 GeV [8].…”

Section: Introductionmentioning

confidence: 99%

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Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy

Agakishiev¹,

Álvarez‐Pol²,

Bałanda³

et al. 2012

Phys. Rev. C

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Data on inclusive dielectron production are presented for the reaction p + p at 2.2 GeV measured with the high acceptance dielectron spectrometer (HADES). Our results supplemented data obtained earlier in this bombarding energy regime with the dilepton spectrometer (DLS) and HADES. The comparison with the 2.09 GeV DLS data is discussed. The reconstructed e + e − pair distributions are confronted with simulations, revealing an excess yield at invariant masses around 0.5 GeV/c 2 . Inclusive cross sections of neutral pion and η production are obtained.

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“…The like-sign pairs were subjected to the same selection criteria as the unlike-sign ones. Both, the unlike sign invariant-mass distribution and the CB, were corrected for the detector and reconstruction inefficiencies on a pair-by-pair basis, defined as a product of single-electron efficiencies deduced from dedicated Monte-Carlo events embedded into real events [7,8]. The geometrical pair acceptance of the HADES detector was obtained in a similar way through single-electron acceptances.…”

Section: Pp Data At 35 Gevmentioning

confidence: 99%

Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer

Rustamov¹,

Credé²,

Eugenio³

et al. 2010

AIP Conference Proceedings

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Abstract.We present the inclusive di-electron invariant-mass spectrum from p+p interactions at 3.5 GeV kinetic beam energy. It is a very important reference for the study of vector meson production off the nucleus, recently investigated by HADES in p+ 93 Nb reactions at the same beam energy. Up to invariant masses of 0.6 GeV/c 2 the main contributions to the e + e − spectrum are π 0 , η, ω and ∆ Dalitz decays. In the vector-meson region a clear peak corresponding to the ω direct decay is reconstructed with ≈2% mass resolution. Subtracting this peak from the spectrum allows to investigate additional sources, in particular the ρ meson. Indeed, the latest results from HSD and UrQMD calculations show different distributions for the shape of the ρ meson at these energies. Therefore it is important to experimentally understand the production mechanism of the ρ meson in elementary reactions. Besides the spectral shape of the mesons, their inclusive production cross sections are also not known at these energies. Due to the large and flat acceptance of the HADES spectrometer for e + e − masses above 0.2 GeV/c 2 and for P T < 1GeV/c, acceptance corrections are to a large extent model independent. This allows us to extract the preliminary inclusive cross section values for the meson productions at these energies.

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

Cited by 92 publications

References 28 publications

Investigating the microscopic properties of strongly interacting matter with HADES

Investigating the microscopic properties of strongly interacting matter with HADES

Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy

Inclusive meson production in 3.5 GeV pp collisions studied with the HADES spectrometer

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