Even anisotropic-flow harmonics are from Venus, odd ones are from Mars

Bachmann B, Borghini N, Feld N, Roch H. Even anisotropic-flow harmonics are from Venus, odd ones are from Mars. arXiv:2203.13306. 2022.We test the ability of the "escape mechanism" to create the anisotropic flow observed in high-energy nuclear collisions. We compare the flow harmonics vnv_nvn​ in the few-rescatterings regime from two types of transport simulations, with 2→22\to 22→2 and 2→02\to 02→0 collision kernels respectively, and from analytical calculations neglecting the gain term of the Boltzmann equation. We find that the even flow harmonics are similar in the three approaches, while the odd harmonics differ significantly