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We perform the first broadband study of Mrk421 from radio to TeV gamma rayswith simultaneous measurements of the X-ray polarization from IXPE. The datawere collected within an extensive multiwavelength campaign organized betweenMay and June 2022 using MAGIC, Fermi-LAT, NuSTAR, XMM-Newton, Swift, andseveral optical and radio telescopes to complement IXPE. During the IXPEexposures, the measured 0.2-1 TeV flux is close to the quiescent state andranges from 25% to 50% of the Crab Nebula without intra-night variability.Throughout the campaign, the VHE and X-ray emission are positively correlatedat a $4\sigma$ significance level. The IXPE measurements unveil a X-raypolarization degree that is a factor of 2-5 higher than in the optical/radiobands; that implies an energy-stratified jet in which the VHE photons areemitted co-spatially with the X-rays, in the vicinity of a shock front. TheJune 2022 observations exhibit a rotation of the X-ray polarization angle.Despite no simultaneous VHE coverage being available during a large fraction ofthe swing, the Swift-XRT monitoring unveils an X-ray flux increase with a clearspectral hardening. It suggests that flares in high synchrotron peaked blazarscan be accompanied by a polarization angle rotation, as observed in some flatspectrum radio quasars. Finally, during the polarization angle rotation, NuSTARdata reveal two contiguous spectral hysteresis loops in opposite directions(clockwise and counter-clockwise), implying important changes in the particleacceleration efficiency on $\sim$hour timescales.

First characterization of the emission behavior of Mrk421 from radio to VHE gamma rays with simultaneous X-ray polarization measurements