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X-ray polarization is a powerful tool to investigate the geometry ofaccreting material around black holes, allowing independent measurements of theblack hole spin and orientation of the innermost parts of the accretion disk.We perform the X-ray spectro-polarimetric analysis of an X-ray binary system inthe Large Magellanic Cloud, LMC X-3, that hosts a stellar-mass black hole,known to be persistently accreting since its discovery. We report the firstdetection of the X-ray polarization in LMC X-3 with the Imaging X-rayPolarimetry Explorer, and find the average polarization degree of 3.2% +- 0.6%and a constant polarization angle -42 deg +- 6 deg over the 2-8 keV range.Using accompanying spectroscopic observations by NICER, NuSTAR, and the NeilGehrels Swift observatories, we confirm previous measurements of the black holespin via the X-ray continuum method, a ~ 0.2. From polarization analysis only,we found consistent results with low black-hole spin, with an upper limit of a< 0.7 at a 90% confidence level. A slight increase of the polarization degreewith energy, similar to other black-hole X-ray binaries in the soft state, issuggested from the data but with a low statistical significance.

First X-ray polarization measurement confirms the low black-hole spin in LMC X-3