The residual magnetic field in peripheral Au+Au collisions at 200 GeV induces a 2⟨cos2ϕ⟩ modulation of up to 0.2 for photoproduced rho0 mesons at pT~0.1 GeV/c, exceeding the polarization signal, so it must be corrected.
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Influence of the residual magnetic field on the azimuthal distribution of final-state particles in photon-nuclear processes
The residual magnetic field in peripheral Au+Au collisions at 200 GeV induces a 2⟨cos2ϕ⟩ modulation of up to 0.2 for photoproduced rho0 mesons at pT~0.1 GeV/c, exceeding the polarization signal, so it must be corrected.