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IXPE is a Small Explorer mission that was launched at the end of 2021 tomeasure the polarization of X-ray emission from tens of astronomical sources.Its focal plane detectors are based on the Gas Pixel Detector, which measuresthe polarization by imaging photoelectron tracks in a gas mixture andreconstructing their initial directions. The quality of the single track, andthen the capability of correctly determining the original direction of thephotoelectron, depends on many factors, e.g., whether the photoelectron isemitted at low or high inclination with respect to the collection plane or theoccurrence of a large Coulomb scattering close to the generation point. Thereconstruction algorithm used by IXPE to obtain the photoelectron emissiondirection, also calculates several properties of the shape of the tracks whichcharacterize the process. In this paper we compare several such properties andidentify the best one to weight each track on the basis of the reconstructionaccuracy. We demonstrate that significant improvement in sensitivity can beachieved with this approach and for this reason it will be the baseline forIXPE data analysis.

A weighted analysis to improve the X-ray polarization sensitivity of IXPE