A global QCD study of direct photon production

PDF Version Also Available for Download.

Description

A global QCD analysis of the direct photon production process from both fixed target and collider experiments is presented. These data sets now completely cover the parton x range from 0.01 to 0.6, thereby providing a stringent test of perturbative QCD and parton distributions. Previous detailed studies of direct photons emphasized fixed target data. The authors find most data sets have a steeper p{sub t} distribution than the QCD prediction. Neither global fits with new parton distributions nor improved photon fragmentation functions can resolve this problem since the deviation occurs at different x values for experiments at different energies. A ... continued below

Physical Description

15 p.

Creation Information

Huston, J.; Lai, H.L.; Tung, W.K.; Kovacs, E.; Kuhlmann, S. & Owens, J.F. January 1, 1995.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Authors

Sponsors

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

A global QCD analysis of the direct photon production process from both fixed target and collider experiments is presented. These data sets now completely cover the parton x range from 0.01 to 0.6, thereby providing a stringent test of perturbative QCD and parton distributions. Previous detailed studies of direct photons emphasized fixed target data. The authors find most data sets have a steeper p{sub t} distribution than the QCD prediction. Neither global fits with new parton distributions nor improved photon fragmentation functions can resolve this problem since the deviation occurs at different x values for experiments at different energies. A more likely explanation is the need for additional broadening of the k{sub t} of the initial state partons. The magnitude and the possible physical origin of this effect are investigated and discussed.

Physical Description

15 p.

Notes

INIS; OSTI as DE97008524

Source

  • Other Information: PBD: Jan 1995

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE97008524
  • Report No.: ANL-HEP-PR--95-24
  • Report No.: MSU-HEP--41027
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/521630 | External Link
  • Office of Scientific & Technical Information Report Number: 521630
  • Archival Resource Key: ark:/67531/metadc690014

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • January 1, 1995

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • Aug. 23, 2016, 3:03 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 3

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Huston, J.; Lai, H.L.; Tung, W.K.; Kovacs, E.; Kuhlmann, S. & Owens, J.F. A global QCD study of direct photon production, report, January 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc690014/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.