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High-resolution Single Particle Analysis from Electron Cryo-microscopy Images Using SPHIRE

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Published on: May 16, 2017

J/psi production at HERA.

P Artoisenet¹, J Campbell, F Maltoni

¹Center for Particle Physics and Phenomenology (CP3), Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.

Physical Review Letters

|April 28, 2009

Summary

This summary is machine-generated.

Next-to-leading order predictions for J/psi photoproduction at HERA show good agreement in shape but not rate. The color-singlet model alone cannot explain experimental J/psi yields and polarization data.

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Area of Science:

High-energy particle physics
Quantum chromodynamics
Collider physics

Background:

J/psi photoproduction is a key process for testing Quantum Chromodynamics (QCD) predictions.
Previous theoretical calculations have faced challenges in fully explaining experimental data, particularly regarding yields and polarization.
The ZEUS Collaboration at HERA has collected significant J/psi photoproduction data.

Purpose of the Study:

To compare next-to-leading order (NLO) color-singlet predictions with experimental J/psi photoproduction data from HERA.
To investigate the discrepancies in J/psi yield and polarization between theoretical predictions and experimental observations.
To assess the validity of the color-singlet model in describing J/psi production at high transverse momentum.

Main Methods:

Analysis of J/psi photoproduction data from the HERA ep collider.
Application of next-to-leading order (NLO) perturbative QCD calculations within the color-singlet model.
Comparison of theoretical predictions for transverse momentum and inelasticity distributions with experimental results.

Main Results:

The shapes of inclusive distributions in transverse momentum and inelasticity are well reproduced by the NLO color-singlet predictions.
The experimental J/psi production rates are observed to be larger than predicted by the color-singlet contribution alone.
NLO calculations predict predominantly longitudinal J/psi polarization at high transverse momentum, contrasting with preliminary ZEUS data trends.

Conclusions:

The color-singlet model, even at NLO, requires additional contributions beyond its own yield to fully account for the observed J/psi photoproduction rates at HERA.
Discrepancies in polarization trends suggest potential limitations of the current color-singlet framework or the need for alternative production mechanisms.
Further theoretical developments and experimental data are necessary to resolve the observed tensions in J/psi photoproduction.