X(3872) Transport in Heavy-Ion Collisions

Abstract

The production of the $X(3872)$ particle in heavy-ion collisions has been contemplated as an alternative probe of its internal structure. To investigate this conjecture, we perform transport calculations of the $X(3872)$ through the fireball formed in nuclear collisions at the LHC. Within a kinetic-rate equation approach as previously used for charmonia, the formation and dissociation of the $X(3872)$ is controlled by two transport parameters, i.e., its inelastic reaction rate and thermal-equilibrium limit in the evolving hot QCD medium. While the equilibrium limit is controlled by the charm production cross section in primordial nucleon-nucleon collisions (together with the spectra of charm states in the medium), the structure information is encoded in the reaction rate. We study how different scenarios for the rate affect the centrality dependence and transverse-momentum ($p_T$) spectra of the $X(3872)$. Larger reaction rates associated with the loosely bound molecule structure imply that it is formed later in the fireball evolution than the tetraquark and thus its final yields are generally smaller by around a factor of two, which is qualitatively different from most coalescence model calculations to date. The $p_T$ spectra provide further information as the later decoupling time within the molecular scenario leads to harder spectra caused by the blue-shift from the expanding fireball.

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Cited by in corpus (22)

• The Present and Future of QCD
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• The nature of $X(3872)$ from high-multiplicity $pp$ collisions
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• $X(3872)$, $X(4014)$, and their bottom partners at finite temperature
• $D{\bar{D}}^{\ast }$ scattering and ${\chi }_{c1}(3872)$ in nuclear matter
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• Recombination of $B_c$ mesons in ultra-relativistic heavy-ion collisions
• Soft and hard scales of the transverse momentum distribution in the Color String Percolation Model
• Theoretical investigation of the molecular nature of $D_{s0}^{\ast }(2317)$ and $D_{s1}(2460)$ and the possibility of observing the $D\bar{D}K$ bound state $K_{c\bar{c}}(4180)$ in inclusive $e^{+}{e}^{-}\to c\bar{c}$ collisions
• Identifying an $\mathrm{X}(3872)$ tetraquark state versus a molecular state by formation time, velocity and temperature in relativistic nuclear collisions
• The study on the structure of exotic states ${\chi }_{c1}(3872)$ via beauty-hadron decays in $pp$ collisions at $\sqrt{s}=8\mathrm{TeV}$
• A potential approach to the $X(3872)$ thermal behavior
• Production of doubly charmed hadron ${\Xi }_{cc}^{++}$ and $T_{cc}^{+}$ in relativistic heavy ion collisions
• Probing the structure of $X(3872)$ in photoproduction
• Interaction of exotic states in a hadronic medium: the $Z_c(3900)$ case
• Charmonium, $B_c$ and X(3872) Transport at the LHC
• Production cross sections of tetraquark states in elementary hadronic collisions