Factorization breaking for higher moments of harmonic flow

We study correlations between harmonic flow vectors squared measured at different transverse momenta. One of the harmonics is taken a fixed momentum and correlated to momentum-averaged same order. Such four-particle correlators, dependent on momentum, have been recently experimentally. Factorization coefficients based ratio such correlators allow independent measurement vector magnitude factorization-breaking coefficient. Moreover, correlation angles as function can be extracted. Results are compared preliminary data ALICE Collaboration. also present predictions for momentum-dependent coefficient mixed harmonics. The with squares serve way independently measure vector, magnitude, angle could used gain additional information fluctuating initial state dynamics in heavy-ion collisions.