Adam, J. ; Galatyuk, Tetyana ; Seck, Florian
Hrsg.: STAR Collaboration (2021)
Measurement of e+e⁻ Momentum and Angular Distributions from Linearly Polarized Photon Collisions.
In: Physical Review Letters, 127 (5)
doi: 10.1103/PhysRevLett.127.052302
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The Breit-Wheeler process which produces matter and antimatter from photon collisions is experimentally investigated through the observation of 6085 exclusive electron-positron pairs in ultraperipheral Au+Au collisions at √sNN=200 GeV. The measurements reveal a large fourth-order angular modulation of cos4Δϕ=(16.8±2.5)% and smooth invariant mass distribution absent of vector mesons (ϕ, ω, and ρ) at the experimental limit of ≤0.2% of the observed yields. The differential cross section as a function of e+e− pair transverse momentum P⊥ peaks at low value with √⟨P2⊥⟩=38.1±0.9 MeV and displays a significant centrality dependence. These features are consistent with QED calculations for the collision of linearly polarized photons quantized from the extremely strong electromagnetic fields generated by the highly charged Au nuclei at ultrarelativistic speed. The experimental results have implications for vacuum birefringence and for mapping the magnetic field which is important for emergent QCD phenomena.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Adam, J. ; Galatyuk, Tetyana ; Seck, Florian |
| Art des Eintrags: | Bibliographie |
| Titel: | Measurement of e+e⁻ Momentum and Angular Distributions from Linearly Polarized Photon Collisions |
| Sprache: | Englisch |
| Publikationsjahr: | 27 Juli 2021 |
| Verlag: | APS Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 127 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1103/PhysRevLett.127.052302 |
| Kurzbeschreibung (Abstract): | The Breit-Wheeler process which produces matter and antimatter from photon collisions is experimentally investigated through the observation of 6085 exclusive electron-positron pairs in ultraperipheral Au+Au collisions at √sNN=200 GeV. The measurements reveal a large fourth-order angular modulation of cos4Δϕ=(16.8±2.5)% and smooth invariant mass distribution absent of vector mesons (ϕ, ω, and ρ) at the experimental limit of ≤0.2% of the observed yields. The differential cross section as a function of e+e− pair transverse momentum P⊥ peaks at low value with √⟨P2⊥⟩=38.1±0.9 MeV and displays a significant centrality dependence. These features are consistent with QED calculations for the collision of linearly polarized photons quantized from the extremely strong electromagnetic fields generated by the highly charged Au nuclei at ultrarelativistic speed. The experimental results have implications for vacuum birefringence and for mapping the magnetic field which is important for emergent QCD phenomena. |
| Zusätzliche Informationen: | Art.No.: 052302 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Untersuchung von Quark-Materie mit virtuellen Photonen |
| Hinterlegungsdatum: | 09 Nov 2023 10:07 |
| Letzte Änderung: | 11 Dez 2023 11:08 |
| PPN: | 513966226 |
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