Journal
PHYSICAL REVIEW LETTERS
Volume 127, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.052302
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Funding
- RCF at BNL
- NERSC Center at LBNL
- Open Science Grid consortium
- Office of Nuclear Physics within the U.S. DOE Office of Science
- U.S. National Science Foundation
- Ministry of Education and Science of the Russian Federation
- National Natural Science Foundation of China
- Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education
- National Research Foundation of Korea, Czech Science Foundation
- Ministry of Education, Youth and Sports of the Czech Republic
- Hungarian National Research
- Development and Innovation Office
- New National Excellency Programme of the Hungarian Ministry of Human Capacities
- Department of Atomic Energy
- Department of Science and Technology of the Government of India
- National Science Centre of Poland, the Ministry of Science,
- Education and Sports of the Republic of Croatia
- RosAtom of Russia and German Bundesministerium fur Bildung
- Wissenschaft
- Forschung
- Technologie (BMBF)
- Helmholtz Association
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The experimental investigation of the Breit-Wheeler process in ultra-peripheral Au + Au collisions revealed a large fourth-order angular modulation and smooth invariant mass distribution. Additionally, the differential cross section as a function of e(+)e(-) pair transverse momentum showed important features, such as peak values and centrality dependence.
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 root s(NN) = 200 GeV. The measurements reveal a large fourth-order angular modulation of cos4 Delta phi = (16.8 +/- 2.5)% and smooth invariant mass distribution absent of vector mesons (phi, omega, and rho) 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-perpendicular to peaks at low value with root < P-perpendicular to(2)> = 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.
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