Finite-t and target-mass corrections to deeply virtual compton scattering

Area of Science:

• High-energy particle physics
• Quantum chromodynamics
• Hadron structure physics

Background:

• Deeply Virtual Compton Scattering (DVCS) is a key process for probing the internal structure of hadrons.
• Previous quantum chromodynamics (QCD) predictions for DVCS at intermediate momentum transfers (Q^2) suffered from uncertainties.
• Kinematic power corrections were not fully calculated, limiting precision.

Purpose of the Study:

• To perform the first complete calculation of kinematic power corrections (~t/Q^2 and ~m^2/Q^2) to the helicity amplitudes of DVCS.
• To reduce uncertainties in QCD predictions for DVCS experiments.
• To provide essential corrections for accurate data analysis.

Main Methods:

• Calculation of higher-order kinematic power corrections.
• Analysis of helicity amplitudes in the context of DVCS.
• Integration of these corrections into QCD predictions.

Main Results:

• The first complete calculation of ~t/Q^2 and ~m^2/Q^2 corrections to DVCS helicity amplitudes is achieved.
• These corrections are found to be significant, particularly the finite-t corrections.
• An important source of uncertainty in QCD predictions for Q^2 ~ 1-10 GeV^2 is removed.

Conclusions:

• The calculated kinematic power corrections are essential for precise QCD predictions in DVCS.
• Future data analysis of DVCS experiments must incorporate these finite-t corrections.
• This work enhances the theoretical framework for understanding hadron structure through high-energy scattering.