Effects of an induced electric field on π^{-}/π^{+} ratio in heavy-ion collisions

Abstract

Using an isospin- and momentum-dependent transport model, we examine the effects of an electric field induced by a variable magnetic field on the π^{-}/π^{+} ratio in central to peripheral heavy-ion collisions at beam energies of 400 and 1500MeV/nucleon. It is shown that while the induced electric field does not affect the total multiplicities of both ${\pi }^{-}$ and ${\pi }^{+}$ mesons at both the lower beam energy of 400MeV/nucleon and the higher beam energy of 1500MeV/nucleon, it reduces (enhances) the emission of ${\pi }^{-}$ (${\pi }^{+}$) mesons in midrapidity, but enhances (reduces) the emission of ${\pi }^{-}$ (${\pi }^{+}$) mesons in forward and backward rapidities especially for the more peripheral collisions at the lower beam energy because of the rapidly transient variable magnetic field at more peripheral collisions and longer reaction duration time at the lower beam energy. These findings indicate that the total π^{-}/π^{+} ratio is still a precisely reliable probe of symmetry energy at both the lower and higher beam energies, but one should consider the induced electric field when using the differential π^{-}/π^{+} ratio to probe the symmetry energy especially for the lower beam energy and more peripheral collisions. Finally, the relative suppression factor based on the ratio of π^{-}/π^{+} in different rapidities is proposed to be an effective probe of the induced electric field generated in heavy-ion collisions due to its maximizing effects of induced electric fields on the differential π^{-}/π^{+} ratio but minimizing effects of some uncertainty factors in heavy-ion collisions.

arXiv comment7 pages, 15 figures, Accepted for publication in Physical Review C

References in corpus (24)

• Recent Progress and New Challenges in Isospin Physics with Heavy-Ion Reactions
• Event-by-event generation of electromagnetic fields in heavy-ion collisions
• Reaction Dynamics with Exotic Beams
• Determination of the stiffness of the nuclear symmetry energy from isospin diffusion
• Circumstantial evidence for a soft nuclear symmetry energy at supra-saturation densities
• Electromagnetic fields and anomalous transports in heavy-ion collisions --- A pedagogical review
• Momentum dependence of symmetry potential in asymmetric nuclear matter for transport model calculations
• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Systematics of central heavy ion collisions in the 1A GeV regime
• Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisions
• Momentum dependence of the symmetry potential and nuclear reactions induced by neutron-rich nuclei at RIA
• Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions
• Symmetry Energy of Nucleonic Matter With Tensor Correlations
• Subthreshold pion production within a transport description of central Au+Au collisions
• Search for Chiral Magnetic Effects in High-Energy Nuclear Collisions
• The impact of energy conservation in transport models on the ${\pi }^{-}/{\pi }^{+}$ multiplicity ratio in heavy-ion collisions and the symmetry energy
• Magnetic effects in heavy-ion collisions at intermediate energies
• Effects of short-range correlation reduced kinetic symmetry energy in heavy-ion collisions at intermediate energies
• Charge asymmetry dependency of ${\pi }^{+}/{\pi }^{-}$ elliptic flow in Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Influence of neutron-skin thickness on ${\pi }^{-}/{\pi }^{+}$ ratio in Pb+Pb collisions
• Symmetry potential of $\Delta (1232)$ resonance and its effects on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions near the pion production threshold
• Effects of pion potential and nuclear symmetry energy on the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions at beam energies around the pion production threshold
• Effect of Delta potential on the pion-/pion+ ratio in heavy-ion collisions at intermediate energies
• Charge-dependent Azimuthal Correlations in Relativistic Heavy-ion Collisions and Electromagnetic Effects

Cited by in corpus (2)

• Effects of retarded electrical fields on observables sensitive to the high-density behavior of nuclear symmetry energy in heavy-ion collisions at intermediate energies
• Magnetic field effects in peripheral heavy-ion collisions around 1 GeV/nucleon