Chernyshev, A.A., & Saleev, V.A. (2024). Single isolated photon production in the NLO${}^\star$ approximation of the Parton Reggeization Approach. arXiv:2410.06644v1 [hep-ph].
This research paper investigates the production of single isolated photons in high-energy collisions, aiming to improve theoretical predictions by incorporating next-to-leading order (NLO*) corrections within the framework of the Parton Reggeization Approach (PRA).
The authors employ the NLO* approximation of the PRA, which combines the resummation of large logarithmic corrections with fixed-order calculations. They introduce a modified Multi-Regge Kinematics (mMRK) subtraction scheme to address double-counting issues between real corrections and unintegrated parton distribution functions (uPDFs). Numerical calculations are performed using the Suave Monte-Carlo algorithm and compared with experimental data from various collaborations.
The NLO* PRA calculations, including the mMRK subtraction scheme, demonstrate good agreement with experimental data on isolated photon transverse momentum spectra across a wide energy range (√S = 2 - 13 TeV) up to pγT/√S ≃ 0.2 - 0.3. The authors also find that the NLO* corrections, specifically the Q ¯Q →γg subprocess, have a small impact after the subtraction procedure, highlighting the self-consistency of the PRA.
The study confirms the effectiveness of the NLO* approximation of the PRA in describing single isolated photon production at high energies. The proposed mMRK subtraction scheme successfully addresses double-counting issues, leading to improved accuracy in theoretical predictions. The findings have implications for understanding photon production mechanisms and for making reliable predictions for future high-energy experiments.
This research contributes to the field of high-energy physics by refining theoretical tools for calculating photon production, a crucial process for probing the structure of matter and fundamental forces. The improved accuracy of the NLO* PRA calculations enhances our understanding of QCD dynamics at high energies and provides valuable input for future experimental analyses.
The study primarily focuses on the transverse momentum spectra of isolated photons. Further investigations could explore other observables, such as angular correlations, to provide a more comprehensive picture of photon production. Additionally, extending the calculations to higher orders in perturbation theory would further improve the precision of the predictions.
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by Alexey Chern... at arxiv.org 10-10-2024
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