Dihadron tomography of high-energy nuclear collisions in next-to-leading order perturbative QCD.


Journal Article

Dihadron spectra in high-energy heavy-ion collisions are studied within the next-to-leading order perturbative QCD parton model with modified jet fragmentation functions due to jet quenching. High-p(T) back-to-back dihadrons are found to originate mainly from jet pairs produced close and tangential to the surface of the dense matter. However, a substantial fraction also comes from jets produced at the center with finite energy loss. Consequently, high-p(T) dihadron spectra are found to be more sensitive to the initial gluon density than the single hadron spectra that are more dominated by surface emission. A simultaneous chi(2) fit to both the single and dihadron spectra can be achieved within a range of the energy loss parameter E(0)=1.6-2.1 GeV/fm. Because of the flattening of the initial jet production spectra at square root s=5.5 TeV, high p(T) dihadrons are found to be more robust as probes of the dense medium.

Full Text

Duke Authors

Cited Authors

  • Zhang, H; Owens, JF; Wang, E; Wang, X-N

Published Date

  • May 25, 2007

Published In

Volume / Issue

  • 98 / 21

Start / End Page

  • 212301 -

PubMed ID

  • 17677768

Pubmed Central ID

  • 17677768

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.98.212301


  • eng

Conference Location

  • United States