Buchumschlag

Dielectron production in central Pb-Pb collisions at √sNN=5.02 TeV

Weitere Versionen anzeigen (265)

The first measurement of the 𝑒+⁢𝑒− pair production at midrapidity and low invariant mass in central Pb-Pb collisions at √𝑠𝑁⁢𝑁=5.02TeV at the Large Hadron Collider is presented. The yield of 𝑒+⁢𝑒− pairs is compared with a cocktail of expected hadronic decay contributions in the invariant mass (𝑚𝑒⁢𝑒)...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Acharya, Shreyasi (VerfasserIn) , Angelov, Venelin (VerfasserIn) , Berdnikova, Anastasia (VerfasserIn) , Bergmann, Luisa (VerfasserIn) , Bórquez Cárcamo, Andrés G. (VerfasserIn) , Crkovská, Jana (VerfasserIn) , Danisch, Meike (VerfasserIn) , Feuillard, Victor (VerfasserIn) , Fokin, Ilya D. (VerfasserIn) , Glässel, Peter (VerfasserIn) , Kroesen, Martin (VerfasserIn) , Nath, Abhishek (VerfasserIn) , Pachmayer, Yvonne C. (VerfasserIn) , Reygers, Klaus (VerfasserIn) , Schicker, Rainer (VerfasserIn) , Schlepper, Felix (VerfasserIn) , Seo, Jinjoo (VerfasserIn) , Skorodumovs, Georgijs (VerfasserIn) , Stachel, Johanna (VerfasserIn) , Stiefelmaier, Stephan (VerfasserIn) , Veen, Casper Arie van (VerfasserIn) , Völkl, Martin (VerfasserIn) , Windelband, Bernd (VerfasserIn) , Yüncü, Alperen (VerfasserIn) , Zanone, Federica (VerfasserIn)
Körperschaft: ALICE (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 18 November 2025
In: Physical review
Year: 2025, Jahrgang: 112, Heft: 5, Pages: 1-27
ISSN:2469-9993
DOI:10.1103/xl6m-vbqk
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/xl6m-vbqk
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/xl6m-vbqk
Volltext
Verfasserangaben:S. Acharya et al., (ALICE Collaboration)
Beschreibung
Zusammenfassung:The first measurement of the 𝑒+⁢𝑒− pair production at midrapidity and low invariant mass in central Pb-Pb collisions at √𝑠𝑁⁢𝑁=5.02TeV at the Large Hadron Collider is presented. The yield of 𝑒+⁢𝑒− pairs is compared with a cocktail of expected hadronic decay contributions in the invariant mass (𝑚𝑒⁢𝑒) and pair transverse momentum (𝑝T,𝑒⁢𝑒) ranges 𝑚𝑒⁢𝑒<3.5GeV/𝑐2 and 𝑝T,𝑒⁢𝑒<8GeV/𝑐. For 0.18<𝑚𝑒⁢𝑒<0.5GeV/𝑐2 the ratio of data to the cocktail of hadronic contributions amounts to 1.40±0.11⁢(stat.)±0.23⁢(syst.)±0.16⁢(cocktail) and 1.42±0.11⁢(stat.)±0.23(syst.)+0.24−0.29⁢(cocktail), including or not including medium effects in the estimation of the heavy-flavor background, respectively. It is consistent with predictions from two different models for an additional contribution of thermal 𝑒+⁢𝑒− pairs from the hadronic and partonic phases. In the intermediate-mass range (1.2<𝑚𝑒⁢𝑒<2.6GeV/𝑐2), the pair transverse impact parameter of the 𝑒+⁢𝑒− pairs (DCA𝑒⁢𝑒, where “DCA” denotes “distance of closest approach”) is used for the first time in Pb-Pb collisions to separate displaced dielectrons from heavy-flavor hadron decays from a possible (thermal) contribution produced at the interaction point. The data are consistent with a suppression of 𝑒+⁢𝑒− pairs from 𝑐⁢‾𝑐 and an additional prompt component. Finally, the first direct-photon measurement in the 10% most central Pb-Pb collisions at √𝑠𝑁⁢𝑁=5.02TeV is reported via the study of virtual direct photons in the transverse momentum range 1<𝑝T<5GeV/𝑐. A model including prompt photons, as well as photons from the preequilibrium and fluid-dynamic phases, can reproduce the result, while being at the upper edge of the data uncertainties.
Beschreibung:Im Titel steht "sNN" unter dem Wurzelsymbol, dabei ist "NN" tiefgestellt
The ALICE collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, A.G. Borquez Carcamo, J. Crkovská, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, M. Kroesen, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, J. Seo, G.Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, M.A. Völkl, B. Bindelband, A. Yuncu, F. Zanone und weitere 1031
Gesehen am 30.04.2026
Beschreibung:Online Resource
ISSN:2469-9993
DOI:10.1103/xl6m-vbqk

Ähnliche Einträge