Rapidity-even dipolar flow in relativistic heavy-ion collisions

@misc{magdy2026rapidityeven,
  title = {{Rapidity-even dipolar flow in relativistic heavy-ion collisions}},
  author = {Niseem Magdy},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2607.17449},
  eprint = {2607.17449},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.17449},
}

TY  - UNPB
TI  - Rapidity-even dipolar flow in relativistic heavy-ion collisions
AU  - Niseem Magdy
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2607.17449
UR  - https://arxiv.org/abs/2607.17449
AB  - Rapidity-even directed flow, v_1^even, provides a sensitive probe of fluctuation-driven dipolar asymmetry in relativistic heavy-ion collisions, but its extraction is complicated by strong first-harmonic non-flow correlations, particularly those associated with global momentum conservation (GMC). In this study, v_1^even and its multi-particle correlations are investigated in Au+Au collisions at √(s_NN)=200GeV using the AMPT and HIJING models. An η-dependent weighting procedure is applied to suppress the leading GMC contribution. The GMC-suppressed HIJING results are strongly reduced for most v_1-related observables, while AMPT reproduces the characteristic sign-changing p_T dependence of v_1^even and exhibits clear sensitivity to the partonic transport setting. The non-normalized mixed-harmonic correlations show a stronger transport dependence, whereas the normalized observables are substantially less sensitive to the absolute final-state response. Comparison with the initial-state eccentricity correlations shows that these normalized observables retain the underlying dipolar, elliptic, and triangular correlation structure after modification by the medium. These results demonstrate that GMC-suppressed rapidity-even dipolar flow correlations provide complementary constraints on initial-state fluctuations and their transformation during the final-state evolution.
ER  -