TY - JOUR
T1 - Measurement of e+e- Momentum and Angular Distributions from Linearly Polarized Photon Collisions
AU - Adam, J.
AU - Adamczyk, L.
AU - Adams, J. R.
AU - Adkins, J. K.
AU - Kabana, S.
AU - (STAR Collaboration)
N1 - Publisher Copyright:
©=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.
PY - 2021/7/30
Y1 - 2021/7/30
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85112679069
U2 - 10.1103/PhysRevLett.127.052302
DO - 10.1103/PhysRevLett.127.052302
M3 - Article
C2 - 34397228
AN - SCOPUS:85112679069
SN - 0031-9007
VL - 127
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 052302
ER -