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clacke (clacke@libranet.de)'s status on Friday, 06-Oct-2023 21:29:59 JST clacke

Woah, awesome.
> When two ions passed by each other without colliding, some of their virtual photons interacted and turned into real photons with very high energy. These photons then collided with each other and produced electron-positron pairs, which were detected by the STAR detector at RHIC. The scientists analyzed more than 6,000 such pairs and found that their angular distribution matched the theoretical prediction for matter creation from light.

news.thesci-universe.com/2023/…
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  Sci & Universe
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  CynAq :audhd: 🤘 (cynaq@neurodifferent.me)'s status on Saturday, 07-Oct-2023 12:37:05 JST CynAq :audhd: 🤘
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  @clacke cue some nut job claiming this is “proof of god” because the Bible says god says “let there be light”
  
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  Ari Auntiefa 🏳️‍🌈🌞♾️ (arisummerland@mstdn.social)'s status on Saturday, 07-Oct-2023 12:37:06 JST Ari Auntiefa 🏳️‍🌈🌞♾️
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  @clacke This is COOL! Thank you for posting it. ✨
  
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  Mystery Babylon :aheartdrawn: (erosdiscordia@inkdrop.space)'s status on Saturday, 07-Oct-2023 12:37:08 JST Mystery Babylon :aheartdrawn:
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  @clacke 😍
  
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  l'empathie mécanique (dpwiz@qoto.org)'s status on Saturday, 07-Oct-2023 12:37:10 JST l'empathie mécanique
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  @clacke
  
  When two lions passed by each other
  Lions, nice. What about them?
  
  without colliding,
  … yeah, right …
  
  some of their virtual photons
  .. huh?
  
  interacted and turned into real photons with very high energy…
  wait, what?..
  
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  AkaSci 🛰️ (akasci@fosstodon.org)'s status on Saturday, 07-Oct-2023 21:26:00 JST AkaSci 🛰️
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  - Andreea Font
  @clacke @andreeafont
  FYI - this result was reported in July 2021 in this article titled "Collisions of Light Produce Matter/Antimatter from Pure Energy" at https://www.bnl.gov/newsroom/news.php?a=119023
  The referenced paper was published on 27 July 2021 - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.052302
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    Measurement of ${e}^{+}{e}^{\ensuremath{-}}$ Momentum and Angular Distributions from Linearly Polarized Photon Collisions
    
    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 $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. The measurements reveal a large fourth-order angular modulation of $\mathrm{cos}4\mathrm{\ensuremath{\Delta}}\ensuremath{\phi}=(16.8\ifmmode\pm\else\textpm\fi{}2.5)%$ and smooth invariant mass distribution absent of vector mesons ($\ensuremath{\phi}$, $\ensuremath{\omega}$, and $\ensuremath{\rho}$) at the experimental limit of $\ensuremath{\le}0.2%$ of the observed yields. The differential cross section as a function of ${e}^{+}{e}^{\ensuremath{-}}$ pair transverse momentum ${P}_{\ensuremath{\perp}}$ peaks at low value with $\sqrt{⟨{P}_{\ensuremath{\perp}}^{2}⟩}=38.1\ifmmode\pm\else\textpm\fi{}0.9\text{ }\text{ }\mathrm{MeV}$ 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.
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