Speaker
Description
The virtual prompt photons are produced at the initial stage of heavy-ion collisions and are sensitive to the extremely strong magnetic field produced in non-central heavy-ion collisions. At LHC energies, this magnetic field can reach intensities of $10^{15}$ - $10^{16}$ T. In the presence of this magnetic field, the dilepton decayed from a virtual photon can be polarized in response to the direction of the magnetic field because the vacuum fermion fluctuation links photons to the magnetic field [1]. We define this phenomenon as the virtual photon polarization and propose the virtual photon polarization as a probe of the magnetic field.
We will present the first numerical calculation results on the intensity of virtual photon polarization in Pb-Pb at $\sqrt{s_ {NN}}=2.76$ TeV, specifically for the decay channel $\gamma^{*}\rightarrow\mu\mu$. These calculations are crucial for evaluating the feasibility of observing this effect with the ALICE experiment. The magnetic field intensity is calculated using magnetohydrodynamics [2], and we have determined the polarization intensity at each time step. This allows us to estimate the inclusive polarization in Pb-Pb collisions.
[1] Ken-Ichi Ishikawa, Daiji Kimura, Kenta Shigaki, Asako Tsuji, Int.J.Mod.Phys.A 28 (2013) 1350100
[2] Nakamura, Miyoshi, Nonaka, and Takahashi, Phys.Rev.C 107, 034912 (2023)
| Category | Theory |
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