2007/01/31 by Han‐Zhong Zhang, Hanzhong Zhang, J. F. Owens +3 · 5 citations
Physics and Astronomy · #Gluon #Hadron #High-Energy Particle Collisions Research #Jet (fluid) #Jet quenching #Nuclear matter #Nuclear physics #Nucleon #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Parton #Perturbative QCD #Physics #QCD matter #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark–gluon plasma #Spectral line #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevlett.98.212301
published as Phys.Rev.Lett.98:212301,2007 · 4 pages in revtex with 5 figures, final version in PRL The numerical tables of the NLO single and dihadron spectra used in this manuscript can be downloaded from ftp://www-nsdth.lbl.gov/pub/xnwang/dihadron/
openalex publication_date 2007/05/25 · arxiv created 2007/05/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.