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Double Prompt J/ψ Hadroproduction in the Parton Reggeization Approach with High-Energy Resummation.
Zhi-Guo He1, Bernd A Kniehl1, Maxim A Nefedov1,2
1II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Physical Review Letters
|November 9, 2019
Summary
This study presents new predictions for double prompt J/ψ hadroproduction. Incorporating initial-state radiation improves agreement with experimental data, especially at higher energies.
Area of Science:
- High Energy Physics
- Quantum Chromodynamics
- Particle Phenomenology
Background:
- Understanding heavy quarkonium production is crucial for probing the strong interaction.
- Previous models struggled to accurately describe double J/ψ hadroproduction data.
Purpose of the Study:
- To provide accurate theoretical predictions for double prompt J/ψ hadroproduction.
- To investigate the role of initial-state radiation in this process.
- To compare theoretical results with recent experimental measurements.
Main Methods:
- Utilizing the nonrelativistic-QCD factorization formalism.
- Employing the parton Reggeization approach for initial-state radiation.
- Implementing Balitsky-Fadin-Kuraev-Lipatov (BFKL) resummation for enhanced cross sections.
Main Results:
- Leading-order predictions show good agreement with ATLAS and CMS data for total cross sections and distributions.
- Discrepancies observed in large invariant mass and rapidity separation regions.
- BFKL resummation significantly improves agreement with data in these high-energy regions.
Conclusions:
- The parton Reggeization approach within nonrelativistic-QCD provides a robust framework for J/ψ hadroproduction.
- Initial-state radiation and BFKL resummation are essential for describing data across a wide kinematic range.
- Further theoretical refinements may be needed for complete data description.
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