Issue |
EPJ Web Conf.
Volume 316, 2025
The 21st International Conference on Strangeness in Quark Matter (SQM 2024)
|
|
---|---|---|
Article Number | 06007 | |
Number of page(s) | 4 | |
Section | Bulk Matter Phenomena, QCD Phase Diagram and Critical Point | |
DOI | https://doi.org/10.1051/epjconf/202531606007 | |
Published online | 27 January 2025 |
https://doi.org/10.1051/epjconf/202531606007
Extracting the dependence of directed flow differences on conserved charges
1 Department of Physics, East Carolina University, Greenville, NC, 27858, USA
2 Department of Physics, Panchayat College, Sambalpur University, Bargarh 768028, Odisha, India
3 Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China
* e-mail: linz@ecu.edu
Published online: 27 January 2025
Recently, seven produced hadron species have been used to construct multiple hadron sets with given differences in the net electric charge (∆q) and strangeness (∆S) between the two sides. A nonzero directed flow difference △v1 has been proposed as a consequence of the electromagnetic field produced in relativistic heavy ion collisions. Previously, we have shown with quark coalescence that Av1 and the slope difference △v′1 depend linearly on both △q and ∆S with zero intercept. Here we emphasize that a two-dimensional function or fit is necessary for extracting the △q- and △S-dependences of △v1. On the other hand, a one-dimensional fit gives a different value for the slope parameter of the ∆q- or ∆S-dependence. Furthermore, a one-dimensional fit is incorrect because its slope parameter depends on the arbitrary scaling factor of a hadron set and is thus ill-defined. We use test data of △v1 to explicitly demonstrate these points.
© The Authors, published by EDP Sciences, 2025
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