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Doubly heavy hadron production in ultraperipheral collisions

Jun Jiang, Hao Yang, Xiao Liang, Zong-Guo Si, Cong-Feng Qiao, Bing-Wei Long, Yan-Rui Liu, Shi-Yuan Li

TL;DR

This paper investigates the production of doubly heavy hadrons in heavy-ion ultraperipheral collisions via photon-photon fusion and photoproduction. It employs NRQCD factorization for pseudoscalar quarkonia and a diquark-fragmentation model for doubly heavy baryons and tetraquarks to predict cross sections and event yields. The results show substantial NLO corrections and indicate that $\eta_c$ and $\Xi_{cc}^{++}$ could be observed at the HL-LHC and FCC, with photoproduction yielding even larger rates for $\Xi_{cc}$ and related states and enabling $T_{cc}$ studies. Overall, UPCs provide a clean electromagnetic environment to probe heavy-quark dynamics and hadronization, offering complementary opportunities to central collisions.

Abstract

The inclusive production of pseudoscalar heavy quarkonia ($η_c,\, η_b,\, B_c$), double heavy baryons $Ξ_{QQ^\prime}$ ($Q^{(\prime)}=c,\,b$ quarks) and tetraquarks $T_{QQ}$ in heavy ion ultraperipheral collisions (UPCs) is studied. Numerical results indicate that the experimental investigation of $η_c,\, Ξ_{cc}$, and $T_{cc}$ is feasible at the upcoming HL-LHC and future FCC. Heavy ion UPCs open another avenue for studying the production of these doubly heavy hadrons.

Doubly heavy hadron production in ultraperipheral collisions

TL;DR

This paper investigates the production of doubly heavy hadrons in heavy-ion ultraperipheral collisions via photon-photon fusion and photoproduction. It employs NRQCD factorization for pseudoscalar quarkonia and a diquark-fragmentation model for doubly heavy baryons and tetraquarks to predict cross sections and event yields. The results show substantial NLO corrections and indicate that and could be observed at the HL-LHC and FCC, with photoproduction yielding even larger rates for and related states and enabling studies. Overall, UPCs provide a clean electromagnetic environment to probe heavy-quark dynamics and hadronization, offering complementary opportunities to central collisions.

Abstract

The inclusive production of pseudoscalar heavy quarkonia (), double heavy baryons ( quarks) and tetraquarks in heavy ion ultraperipheral collisions (UPCs) is studied. Numerical results indicate that the experimental investigation of , and is feasible at the upcoming HL-LHC and future FCC. Heavy ion UPCs open another avenue for studying the production of these doubly heavy hadrons.

Paper Structure

This paper contains 5 sections, 2 equations, 3 figures, 4 tables.

Table of Contents

  1. Why ultraperipheral collisions?
  2. Why doubly heavy hadrons?
  3. Heavy quarkonium production in UPCs
  4. Doubly heavy baryon and tetraquark production in UPCs
  5. Summary

Figures (3)

  • Figure 1: The differential transverse momentum distribution $d\sigma /dp_t$ of $\eta_c$ for the $\eta_c+c+\bar{c}$ production via photon-photon fusion in ultraperipheral Pb-Pb collision at $\sqrt{S_{\mathrm{NN}}}=$ 5.52 and 39.4 TeV. Here, $\mu=\sqrt{4m_c^2 + p_{t}^2}$ and the transverse momentum cut $1\ {\rm GeV} \le p_{t} \le 50$ GeV is employed.
  • Figure 2: The transverse momentum $p_T$ and rapidity y distributions for $\Xi_{cc}$ production via photon-photon fusion in UPCs. Here, for the $p_T$ distribution, y is cut to be $[-3,3]$; for the y distribution, $p_T$ is cut to be $1\hbox{-}30$ GeV.
  • Figure 3: The transverse momentum $p_T$ and rapidity y distributions for $\Xi_{cc}$ production via photoproduction in UPCs. Here, for the $p_T$ distribution, y is cut to be $[-3,3]$; for the y distribution, $p_T$ is cut to be $1\hbox{-}30$ GeV.