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Automated Delivery of Microfabricated Targets for Intense Laser Irradiation Experiments

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

V M Braun¹, A N Manashov, B Pirnay

¹Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany.

Physical Review Letters

|February 2, 2013

Summary

This study presents the first complete calculation of kinematic power corrections for deeply virtual Compton scattering. These corrections are crucial for improving quantum chromodynamics predictions in experiments at intermediate momentum transfers.

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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.