Measurement of dielectron production in central Pb-Pb collisions at √sNN=2.76 TeV
The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √sNN=2.76TeV 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<mee<3.5GeV/c2. The ratio of data...
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 February 2019
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| In: |
Physical review
Year: 2019, Volume: 99, Issue: 2 |
| ISSN: | 2469-9993 |
| DOI: | 10.1103/PhysRevC.99.024002 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevC.99.024002 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.99.024002 
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| Author Notes: | S. Acharya et al. (ALICE Collaboration*) |
MARC
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| 246 | 3 | 0 | |a sqrt |
| 246 | 3 | 3 | |a Measurement of dielectron production in central Pb-Pb collisions at square root s NN = 2.76 TeV |
| 264 | 1 | |c 14 February 2019 | |
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| 500 | |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt | ||
| 500 | |a Gesehen am 30.07.2019 | ||
| 500 | |a S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, V.J.G Feuillard, P. Glässel, J. Kim, M. Kim, S. Klewin, M.K. Köhler, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, J. Stachel, D.F. Weiser, B. Windelband [und 1002 weitere] | ||
| 520 | |a The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √sNN=2.76TeV 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<mee<3.5GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15<mee<0.7GeV/c2, 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<mee<1GeV/c2 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 ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1<mee<0.3GeV/c2 and in the transverse-momentum intervals 1<pT,ee<2GeV/c and 2<pT,ee<4GeV/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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