The effect of Lorentz-like force on collective flows of K$^{+}$ in Au+Au collisions at 1.5 GeV/nucleon}{The effect of Lorentz-like force on collective flows of $K^{+}$ in Au+Au collisions at 1.5 GeV/nucleon

TL;DR

This paper investigates how the Lorentz-like force affects the collective flow of K$^{+}$ mesons in Au+Au collisions at 1.5 GeV/nucleon, demonstrating its crucial role in matching experimental flow data.

Contribution

The study introduces the Lorentz-like force into the kaon-nucleon potential within a quantum molecular dynamics model, highlighting its importance in accurately modeling kaon flow.

Findings

Lorentz-like force significantly influences K$^{+}$ flow patterns.

Inclusion of the force improves agreement with KaoS experimental data.

The model successfully reproduces directed and elliptic flow measurements.

Abstract

Producing kaon mesons in heavy-ion collisions at beam energies below their threshold energy is an important way to investigate the properties of dense nuclear matter. In this study, based on the newly updated version of the ultrarelativistic quantum molecular dynamics model, we introduce the kaon-nucleon (KN) potential, including both the scalar and vector (also dubbed Lorentz-like) aspects. We revisit the influence of the KN potential on the collective flow of K$^{+}$ mesons produced in Au+Au collisions at $E_{lab}$ = 1.5 GeV/nucleon and find that the contribution of the newly included Lorentz-like force is very important, particulary for describing the directed flow of K$^{+}$. Finally, the corresponding KaoS data of both directed and elliptic flows can be simultaneously reproduced well.