The lifetime of the strong magnetic field generated in relativistic heavy-ion collisions remains one of the major open questions in the study of the quark--gluon plasma. We propose heavy-quark spin precession as a probe to quantify the magnetic field and its profile in such collisions. We investigate the Larmor evolution of polarized charm and bottom quarks propagating through an expanding quark--gluon plasma in the presence of the magnetic field. We show that realistic magnetic-field strengths and lifetimes generate measurable accumulated precession phases prior to hadronization, leading to characteristic charge-dependent polarization splittings between $\Lambda_c^+$ and $\bar{\Lambda}_c^-$, as well as between $\Lambda_b^0$ and $\bar{\Lambda}_b^0$, through the mixing of transverse and longitudinal polarization components. The predicted signals exhibit distinctive transverse-momentum and quark-mass dependence, providing complementary sensitivity to the magnetic-field lifetime in the charm and bottom sectors. Our results suggest heavy-flavor polarization, especially in the charm sector, as a quantitative probe for the space--time evolution of magnetic fields in relativistic heavy-ion collisions.
We study how magnetic fields affect the onset of quark saturation, which limits the domain of applicability of a purely baryonic description. We consider matter composed of electrically neutral $ddu$ baryons, including neutron- and $\Delta^0$-like states. Using a simple constituent-quark model, we compute the baryon wa...
Heavy-quark spin dynamics in the quark-gluon plasma provides a potential probe of the interaction between heavy quarks and the medium. We develop a stochastic framework in which the random momentum kicks responsible for heavy-quark diffusion also induce spin rotation through Thomas precession. Starting from the Thomas-...
Ankit Kumar, Sourav Dey, Vinod Chandra et al.· 0 citations
Strong magnetic fields generated in non-central heavy-ion collisions break rotational symmetry and can imprint anisotropy on the produced quantum chromodynamics (QCD) matter. Within a hadron resonance gas framework in the presence of an external magnetic field, we investigate the resulting anisotropy in the equation of...
We extend a lattice-QCD determination of the response of the quark-gluon plasma to an external magnetic field using a Taylor expansion of the pressure at zero field. A zero-net-flux ``half-and-half''magnetic-field configuration permits continuous differentiation with respect to the field amplitude on gauge ensembles ge...
The dead-cone effect reflects the mass dependence of QCD radiation from heavy quarks. We investigate this phenomenon from charm and bottom to top quarks using two-dimensional angular distributions and single-particle inclusive momentum spectra. The angular distributions illustrate the depletion of radiation around the...
R. Pérez-Ramos, S. Kluth, Wolfgang Ochs· 0 citations
We calculate analytic expression for the cross section up to order $(eB)^2$ for the production of a heavy quark $(Q)$ of mass $m_Q$ through the gluon $(g)$ fusion process $g+g\to Q+\bar{Q}$ in the presence of a constant weak external magnetic field $(B)$ with strength $eB \ll m_Q^2$. This is done using the weak-field e...
S. Saha, Sandeep Chatterjee, U. Dey et al.· 0 citations
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