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Agakichiev, G.; Agodi, C.; Álvarez‐Pol, H.; Bałanda, A.; Bertini, D.; Bielčík, J.; Bellia, G.; Böhmer, M.; Bokemeyer, H.; Boyard, J. L.; Braun‐Munzinger, P.; Cabanelas, P.; Chernenko, S.; Christ, T.; Coniglione, R.; Coséntino, L.; Díaz, Julio Pérez; Dohrmann, F.; Durán, I.; Eberl, T.; Enghardt, W.; Fabbietti, L.; Fateev, O.; Fernández, C.; Finocchiaro, P.; Friese, J.; Fröhlich, I.; Fuentes, B.; Garabatos, C.; Garzón, J. A.; Gernhäuser, R.; Gilardi, C.; Golubeva, M.; González-Díaz, D.; Grosse, E.; Guber, F.; Hennino, T.; Hlaváč, S.; Holzmann, R.; Homolka, J.; Ierusalimov, A.; Iori, I.; Ivashkin, A.; Jaskuła, Marian; Jurković, M.; Kagarlis, M.; Kajetanowicz, M.; Kämpfer, B.; Kanaki, K.; Karavicheva, T.; Kastenmüller, A.; Kidoń, L.; Kienle, P.; Köenig, I.; Koenig, W.; Körner, H. J.; Kolb, B. W.; Kötte, R.; Krücken, R.; Куглер, А.; Kühn, W.; Kulessa, R.; Kurepin, A.; Lang, S.; Lange, S.; Lehnert, J.; Lins, E.; Magestro, D.; Maiolino, C.; Malarz, A.; Markert, J.; Metag, V.; Mousa, J.; Münch, M.; Müntz, C.; Naumann, L.; Nekhaev, A.; Novotný, Jiří; Otwinowski, J.; Pachmayer, Y.; Pechenov, V.; Perez, Tiago; Piattelli, P.; Pietraszko, J.; Pleskač, R.; Płoskoń, M.; Pospíšil, V.; Prokopowicz, W.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Ritman, J.; Roy‐Stéphan, M.; Rustamov, A.; Sadovsky, A.; Sailer, B.; Salabura, P.; Sánchez, M. Calderón De La Barca; Sapienza, P.; Schmah, A.; Schön, Helmut; Schön, Wolfgang; Schröder, Christian; Schwab, E.; Simon, R. S.; Smolyankin, V.; Smykov, L.; Spataro, S.; Spruck, B.; Ströbele, H.; Stroth, J.; Sturm, C.; Sudol, M.; Suk, M.; Taranenko, A.; Tlustý, P.; Toia, A.; Traxler, M.; Tsertos, H.; Vassiliev, Dmitri; Vázquez, A.; Wagner, V.; Waluś, W.; Wiśniowski, M.; Wójcik, Tomasz; Wüstenfeld, J.; Zanevsky, Y.; Zeitelhack, K.; Zovinec, D.; Zumbruch, P.

doi:10.1103/physrevlett.98.052302

Cited by 126 publications

(70 citation statements)

References 20 publications

(11 reference statements)

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“…3 reveals that also in Ar + KCl the contributions from η (and ω) Dalitz decays do not exhaust the measured pair yield at intermediate masses, that is, for M ee 0.15-0.5 GeV/c 2 . Just like in our previous C + C measurements [8,9], there is a strong excess over the cocktail of known long-lived sources. We know furthermore from our comparison [18] of dielectron production in free nucleon-nucleon and C + C reactions that in the light carbon-carbon system the excess yield N exc is of baryonic origin: decays and NN-that is, mostly pn-bremsstrahlung.…”

Section: B Intermediate-mass Excesssupporting

confidence: 71%

“…The excess of electron pairs observed by DLS in the η mass region has recently been reinvestigated with the HADES 1 detector [7] at SIS18 with carbon beams of 1A and 2A GeV bombarding carbon targets [8,9]. These new data fully confirmed the earlier DLS result and thereby rechallenged theory to come up with a proper description of pair production at low energies.…”

Section: Introductionmentioning

confidence: 53%

“…5, where the ratios of the following pair yields are shown: Ar + KCl/N + N , and C + C/N + N for 1A and 2A GeV. For this the C + C data were taken from [8,9] and transformed into the acceptance of the present experiment. The Ar + KCl/N + N ratio is very close to unity at low masses, dominated by the π 0 Dalitz pairs, but for M > 0.15 GeV/c 2 it rises to about 3, indicating the onset of processes not accounted for in the reference system.…”

Section: B Intermediate-mass Excessmentioning

confidence: 99%

“…To do so we have compiled in Fig. 6 the excess yields integrated over the mass region M ee = 0.15-0.5 GeV/c 2 from all available reaction systems [6,8,9]. For comparison, inclusive π 0 and η multiplicities measured in photon calorimetry with the TAPS detector [10,11] are plotted as well.…”

Section: B Intermediate-mass Excessmentioning

confidence: 99%

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Dielectron production in Ar + KCl collisions at 1.76AGeV

Agakishiev¹,

Bałanda²,

Belver³

et al. 2011

Phys. Rev. C

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We present results on dielectron production in 40 Ar + KCl collisions at 1.76A GeV. For the first time ω mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The ω multiplicity has been extracted and compared to the yields of other particles, in particular of the φ meson. At intermediate e + e − invariant masses, we find a strong enhancement of the pair yield over a reference spectrum from elementary nucleon-nucleon reactions, suggesting the onset of nontrivial effects of the nuclear medium. Transverse-mass spectra and angular distributions have been reconstructed in three invariant mass bins. In the former unexpectedly large slopes are found for high-mass pairs. The latter, in particular the helicity-angle distributions, are largely consistent with expectations for a pair cocktail dominated at intermediate masses by Dalitz decays.

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Section: B Intermediate-mass Excesssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 53%

Section: B Intermediate-mass Excessmentioning

confidence: 99%

Section: B Intermediate-mass Excessmentioning

confidence: 99%

See 2 more Smart Citations

Dielectron production in Ar + KCl collisions at 1.76AGeV

Agakishiev¹,

Bałanda²,

Belver³

et al. 2011

Phys. Rev. C

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“…Dilepton measurements have been a subject of experimental investigations since the early days of heavy ion collisions [7][8][9][10][11][12]. Of particular interest, measurements from CERES and NA60 ( ffiffiffiffiffiffiffi ffi s NN p ¼ 8.75-17.2 GeV) showed a clear enhancement in the mass region below ∼0.7 GeV=c 2 when compared to known hadronic sources.…”

mentioning

confidence: 99%

Dielectron Mass Spectra fromAu+AuCollisions atsNN=200 <

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2014

Phys. Rev. Lett.

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Dilepton production in pp and CC collisions with HADES

Fröhlich

Agakishiev

Agodi

et al.

The IVth International Conference on Quarks and Nuclear Physics

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Dilepton production has been measured with HADES, the "High Acceptance DiElectron Spectrometer". In pp collisions at 2.2GeV kinetic beam energy, exclusive η production and the Dalitz decay η → γe + e − has been reconstructed. The electromagnetic form factor is well in agreement with existing data. In addition, an inclusive e + e − spectrum from the 12 C+ 12 C reaction at 2AGeV is presented and compared with a thermal model. 2

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Dielectron Production inC12+C12Collisions at2A

Cited by 126 publications

References 20 publications

Dielectron production in Ar + KCl collisions at 1.76AGeV

Dielectron production in Ar + KCl collisions at 1.76AGeV

Dielectron Mass Spectra fromAu+AuCollisions atsNN=200 <

Dilepton production in pp and CC collisions with HADES

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