Chen B.-TChung M.-ZYU-TIN HUANGTam M.K.2022-04-252022-04-25202110298479https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116272829&doi=10.1007%2fJHEP10%282021%29011&partnerID=40&md5=e678aa9196e9ddabd40d8e3f3bd837achttps://scholars.lib.ntu.edu.tw/handle/123456789/606843Recent studies have shown that minimal couplings for massive spinning particles, which in the classical limit reproduce the leading PM Kerr black hole dynamics, leads to an eikonal S-matrix exhibiting spin-entanglement suppression. In this paper we trace this phenomenon to the suppression of spin-flipping components in the S-matrix, known to be the hallmark of minimal coupling in the ultra-relativistic limit. We further generalize the consideration to charged and N = 4 blackholes, demonstrating that in both cases maximal suppression occurs at the extremal limit. ? 2021, The Author(s).Black Holes; Extended Supersymmetry; Scattering Amplitudes;journal article10.1007/JHEP10(2021)0112-s2.0-85116272829