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Title: Measurement of e + e - Momentum and Angular Distributions from Linearly Polarized Photon Collisions

Journal Article · · Physical Review Letters
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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 $$\sqrt{s_{NN}}$$ = 200 GeV. The measurements reveal a large fourth-order angular modulation of cos 4Δ$$\phi$$ = (16.8 ± 2.5)% and smooth invariant mass distribution absent of vector mesons ($$\phi$$, 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 $$\sqrt\langle$$$$P2\atop{⟂}$$$$\rangle$$ = 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704
OSTI ID:
1807956
Report Number(s):
BNL--221800-2021-JAAM
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 127; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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