2016/08/31 by STAR Collaboration, L. Adamczyk, J. K. Adkins +348
Engineering · Mathematics · Physics and Astronomy · #Charge (physics) #Computer science #High-Energy Particle Collisions Research #Materials science #Mathematics #Nuclear reactor physics and engineering #Particle physics #Physics #Quantum Chromodynamics and Particle Interactions #Statistics #nucl-ex
paper · pdf · doi:10.1103/physrevlett.118.012301
published as Phys. Rev. Lett. 118, 012301 (2017) · 8 pages, 4 figures, Accepted for publication in Phys. Rev. Lett
arxiv created 2016/12/12 · openalex publication_date 2017/01/05 · arxiv updated 2017/01/11 · openalex created_date 2020/05/13 · openalex updated_date 2026/08/05
We present the first measurement of charge-dependent directed flow in Cu+Au collisions at sqrt[sNN]=200 GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics model, which suggests that most of the electric charges, i.e., quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1 fm/c.