Abstract
The effect of inverse magnetic catalysis (IMC) has been observed on the conserved charge fluctuations and the correlations along the chemical freeze-out curve in a hadron resonance gas model. The fluctuations and the correlations have been compared with and without charge conservations. The charge conservation plays an important role in the calculation of the fluctuations at nonzero magnetic field and for the fluctuations in the strange charge at zero magnetic field. The charge conservation diminishes the correlations $\chi_{BS}$ and $\chi_{QB}$, but enhances the correlation $\chi_{QS}$. The baryonic fluctuations (2nd order) at $B = 0.25$ ${GeV}^2$ increases more than two times compared to $B = 0$ at higher $\mu_{B}$. The fluctuations have been compared at nonzero magnetic field along the freeze-out curve i.e along fitted parameters of the chemical freeze-out temperature and chemical potentials, with the fluctuations at nonzero magnetic field along the freeze-out curve with the IMC effect, and the results are very different with the IMC effect. This is clearly seen in the products of different moments ${{\sigma}^2}/{M}$ and $S\sigma$ of net-kaon distribution.
Highlights
The ultimate goal of ultrarelativistic heavy ion collisions is to study the phase structure of a strongly interacting system in QCD at finite temperature T and finite baryon chemical potential μB
The basic features of the physical system created at the time of chemical freeze-out in heavy ion collisions are well described in terms of the hadron resonance gas (HRG) model [4,5]
There is an excellent agreement between experimental data on particle ratios in heavy ion collisions with corresponding thermal abundances calculated in the HRG model at appropriately chosen temperature and baryon chemical potential with different conserved charges taken into account
Summary
The ultimate goal of ultrarelativistic heavy ion collisions is to study the phase structure of a strongly interacting system in QCD at finite temperature T and finite baryon chemical potential μB. There is an excellent agreement between experimental data on particle ratios in heavy ion collisions with corresponding thermal abundances calculated in the HRG model at appropriately chosen temperature and baryon chemical potential with different conserved charges taken into account. The effect of magnetic field on the conserved charge fluctuations have been studied in the HRG model along the universal freeze-out curve and compared with the available experimental data [20]. It has been shown that the IMC effect arises in the presence of an external magnetic field in lattice QCD, in which the chiral transition temperature decreases [21]. One considers the IMC effect to lower the freeze-out temperature in the HRG model in the presence of the external magnetic field.
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