e + e--pair production in Pb-Au collisions at 158 GeV per nucleon

Agakichiev, G.; Appelshäuser, H.; Bielčíková, J.; Baur, Roland; Braun‐Munzinger, P.; Cherlin, A.; Damjanović, S.; Drees, A.; Esumi, S.; Faschingbauer, U.; Fraenkel, Z.; Gatti, E.; Glässel, P.; Hering, G.; Heros, C. Pérez de los; Holl, P.; Lenkeit, B.; Marı́n, A.; Messer, F.; Messer, M.; Miśkowiec, D.; Nix, O.; Pfeiffer, A.; Rak, J.; Ravinovich, I.; Razin, S. V.; Řehák, P.; Richter, Matthias; Sampietro, Marco; Sako, H.; Saveljić, N.; Schmitz, W.; Schukraft, J.; Seipp, W.; Shimanskiy, S. S.; Socol, E.; Specht, H.J.; Stachel, J.; Tel-Zur, G.; Tserruya, I.; Ullrich, T.; Voigt, Christiane; Voloshin, S.; Weber, C.; Wessels, J. P.; Wienold, T.; Wurm, J.P.; Yurevich, V. I.

doi:10.1140/epjc/s2005-02272-3

Cited by 124 publications

(17 citation statements)

References 105 publications

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“…The excess is described by a large variety of hydrodynamic and cascade models (see [518] for review), most of which assume the formation of a QGP phase. Also at the SPS, a modification of low-mass dilepton pairs in S-Au and Pb-Au collisions relative to the expectation of in-vacuum hadron decays was observed by CERES [519][520][521][522][523] and studied with high precision by NA60 in In-In collisions [524][525][526][527]. The data are consistent with an in-medium ρ spectral function that, driven by the coupling to baryons, melts and approaches the one from qq annihilation in the vicinity of the phase transition [528][529][530], which is compatible with chiral symmetry restoration [136,531].…”

Section: Thermal Radiation and In-medium Spectral Functionmentioning

confidence: 93%

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Citron,

Dainese,

Grosse-Oetringhaus

et al. 2018

Preprint

123

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The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus-nucleus) systems, the exploration of parton densities in nuclei in a broad (x, Q 2 ) kinematic range and the search for the possible onset of parton saturation. In order to address these scientific goals, high-luminosity Pb-Pb and p-Pb programmes are considered as priorities for Runs 3 and 4, complemented by high-multiplicity studies in pp collisions and a short run with oxygen ions. High-luminosity runs with intermediate-mass nuclei, for example Ar or Kr, are considered as an appealing case for extending the heavy-ion programme at the LHC beyond Run 4. The potential of the High-Energy LHC to probe QCD matter with newly-available observables, at twice larger center-of-mass energies than the LHC, is investigated.

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Section: Thermal Radiation and In-medium Spectral Functionmentioning

confidence: 93%

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Citron,

Dainese,

Grosse-Oetringhaus

et al. 2018

Preprint

123

View full text Add to dashboard Cite

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“…The role of the ρ 0 meson as a mediator in the processes which produce thermal dileptons in the hot hadronic gas had already been highlighted a few years before and most of the theoretical models predicted an enhancement of the ρ 0 , due to regeneration via π + π − → ρ 0 , but no in-medium effects. Theoretical models used to describe CERES data indicated two possible scenarios: a dropping of the ρ 0 pole mass or a broadening of its width [21][22][23]. Unfortunately, the mass resolution and statistical precision of the first CERES data did not provide a clear discrimination between these two possible scenarios, which both fitted the data similarly well.…”

Section: Introductionmentioning

confidence: 98%

Measurement of dielectron production in central Pb-Pb collisions at sNN=2.76TeV

Acharya¹,

Acosta²,

Adamová³

et al. 2019

Phys. Rev. C

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The first measurement of dielectron (e + e −) production in central (0-10%) Pb-Pb collisions at √ s NN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < m ee < 3.5 GeV/c 2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ 0 is measured in the invariant-mass range 0.15 < m ee < 0.7 GeV/c 2 , where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 (stat.) ± 0.08 (syst.) ± 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < m ee < 1 GeV/c 2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ 0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < m ee < 0.3 GeV/c 2 and in the transverse-momentum intervals 1 < p T,ee < 2 GeV/c and 2 < p T,ee < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties.

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“…For the normalization of dilepton invariant mass spectra, the measuring of the π 0 contribution is crucial. The cross section of the η is essential to determine the non-trivial enhancement of low-mass dileptons (M e + e − between 0.15 GeV /c 2 and 0.55 GeV /c 2 ), that was found by DLS [4] and HADES [5] at Bevalac/SIS18, CERES [6] and NA60 [7] at CERN, and STAR [8] and Phenix [9] at RHIC. This contribution will focus on the reconstruction of neutral π 0 and η with the HADES detector via conversion method.…”

Section: Heavy-ion Collisionsmentioning

confidence: 99%