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Charmed nuclei and exotic charmed meson production at CBM@FAIR and ALICE@LHC

Thanaporn Chimruang, Christoph Herold, Ayut Limphirat, Yupeng Yan, Jan Steinheimer, Benjamin Dönigus, Tom Reichert, Volodymyr Vovchenko, Marcus Bleicher

Abstract

We make predictions for the expected multiplicities of exotic charmed hadrons and charmed nuclei in Au+Au collisions at SIS100 and LHC beam energies, using input on light hadron and charm production from the UrQMD transport model, and applying the Thermal-FIST model. We demonstrate that the CBM experiment has the capability to explore these states with production rates of one per 3 seconds for $χ_{c0}(1P)$ and $χ_{c1}(1P)$, and one every 3 minutes for $X(3872)$ at the expected data taking rates. Due to the higher baryon density at CBM compared to the LHC, charmed nuclei, if they exist, will be equally abundant at CBM as at the LHC, even though the total charm production at CBM is much lower.

Charmed nuclei and exotic charmed meson production at CBM@FAIR and ALICE@LHC

Abstract

We make predictions for the expected multiplicities of exotic charmed hadrons and charmed nuclei in Au+Au collisions at SIS100 and LHC beam energies, using input on light hadron and charm production from the UrQMD transport model, and applying the Thermal-FIST model. We demonstrate that the CBM experiment has the capability to explore these states with production rates of one per 3 seconds for and , and one every 3 minutes for at the expected data taking rates. Due to the higher baryon density at CBM compared to the LHC, charmed nuclei, if they exist, will be equally abundant at CBM as at the LHC, even though the total charm production at CBM is much lower.
Paper Structure (7 sections, 5 equations, 7 figures, 2 tables)

This paper contains 7 sections, 5 equations, 7 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Methodology
  3. Thermal hadron yields
  4. Model inputs: Open and hidden charm yields
  5. Fit results - input and bulk
  6. Statistical model predictions for (exotic) charm states
  7. Summary and Discussion

Figures (7)

  • Figure 1: Input (symbols) and fitted (lines) light hadron multiplicities from the UrQMD simulations of Au+Au collisions at different centrality selections. For the fits only hadron multiplicities without light nuclei where used.
  • Figure 2: Input (symbols) and fitted (lines) light hadron multiplicities from the UrQMD simulations of Au+Au collisions at different centrality selections. For the fits hadron multiplicities including deuterons where used.
  • Figure 3: Input (symbols) and predicted charm hadron multiplicities in Au+Au collisions at different centralities as function of the beam energy.
  • Figure 4: Freeze out points from fits to UrQMD, in the ${T-\mu_B}$ phase diagram. Different centralities are shown as filled symbols with solid lines compared to world data (grey symbols) Cleymans:1998fqBecattini:2000jwCleymans:2005xvAndronic:2005ypHADES:2010wuaLorenz:2014ejaBecattini:2016xctLysenko:2024hqp and a parametrization of the freeze out line from Lysenko:2024hqp. The dashed line shows the fit for central collisions when the deuteron is included in the list of fitted particles.
  • Figure 5: Predicted (lines) exotic charmed hadron multiplicities in Au+Au collisions at different centralities as function of the beam energy.
  • ...and 2 more figures