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Magnetic field induced hair structure in charmonium gluon-dissociation
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Magnetic field induced hair structure in charmonium gluon-dissociation
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We study electromagnetic field effect on charmonium gluon-dissociation in quark-gluon plasma. With the effective Hamiltonian derived from QCD multipole expansion under an external electromagnetic field, we first solve the two-body Schr\"odinger equation for a pair of charm quarks with mean field potentials for color and electromagnetic interactions and obtain the charmonium binding energies and wave functions, and then calculate the gluon-dissociation cross-section and decay width by taking the color electric and magnetic dipole interactions as perturbations above the mean field and employing Fermi's Golden Rule. Considering the charmonium deformation in magnetic field, the discrete Landau energy levels make the dissociation cross-section grow hair, and the electric dipole channel is significantly changed, especially for the $P-$wave states $\chi_{c0}$ and $\chi_{c\pm}$. From our numerical calculation, the magnetic field strength $eB=5~m_\pi^2$ already changes the gluon dissociation strongly, which may indicate measurable effects in high-energy nuclear collisions.
Forward citations
Cited by 4 Pith papers
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Radially excited charmonium masses fall sharply with magnetic field strength under lattice-inspired anisotropic confinement, while the ground state barely moves.
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A Landau-Zener Hamiltonian fitted to the static charmonium spectrum predicts that fast magnetic-field sweeps drive nonadiabatic transitions between charmonium states, with Stückelberg interference controlling final po...
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