What question did this study set out to answer?

This work aims to calculate next-to-leading open charm production in gamma-proton collisions using a specific formalism.

March 5, 2026Open Access

Charm Photoproduction via Fragmentation

Key Points

This work aims to calculate next-to-leading open charm production in gamma-proton collisions using a specific formalism.
Utilized the Perturbative Fragmentation Function formalism for calculations.
Allowed for the resummation of log terms relating to transverse momentum over mass.
Compared results to fixed order next-to-leading order (NLO) calculations.
Analyzed the impact of renormalization and factorization scales on results.
Results align with fixed order NLO calculations in the larger transverse momentum (pT) region.
Minor discrepancies appear for very large pT values and phase space qualities.
Resummation leads to reduced sensitivity to scale choices compared to previous methods.

Abstract

The next-to-leading open charm production in γp collitions is calculated within the Perturbative Fragmentation Function formalism, to allow resummation of αₛ log⁡ (pT²/m²) terms. In the large pT region (pT > m) the result is consistent with the fixed order NLO calculation, small discrepancies being found for very large pT and the age of phase space. the two approaches differ in the definition and the relative contribution of the direct and resolved terms, but essentially agree of their sum. The resummation is found to lead to a reduced sensitivity to the choice of the renormalization/factorization scale.

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