Dihadron Tomography of High-Energy Nuclear Collisions inNext-to-Leading Order Perturbative QCD

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Back-to-back dihadron spectra in high-energy heavy-ioncollisions are studied within the next-to-leading order (NLO)perturbative QCD parton model with jet quenching incorporated viamodified jet fragmentation functions due to radiative parton energy lossin dense medium. The experimentally observed appearance of back-to-backdihadron sat high p_T is found to originate mainly from jet pairsproduced close and tangential to the surface of the dense matter.However, a substantial fraction of observed high p_T dihadrons also comesfrom jets produced at the center of the medium after losing finite amountof energy. Consequently, the suppression factor of such high-p_T hadronpairs is foundto be more sensitive to the initial gluon density ... continued below

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Zhang, Hanzhong; Owens, Joseph F.; Wang, Enke & Wang, Xin-Nian January 17, 2007.

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Back-to-back dihadron spectra in high-energy heavy-ioncollisions are studied within the next-to-leading order (NLO)perturbative QCD parton model with jet quenching incorporated viamodified jet fragmentation functions due to radiative parton energy lossin dense medium. The experimentally observed appearance of back-to-backdihadron sat high p_T is found to originate mainly from jet pairsproduced close and tangential to the surface of the dense matter.However, a substantial fraction of observed high p_T dihadrons also comesfrom jets produced at the center of the medium after losing finite amountof energy. Consequently, the suppression factor of such high-p_T hadronpairs is foundto be more sensitive to the initial gluon density than thesingle hadron spectra that are dominated by surface emission. Asimultaneous chi2-fit to both the single and dihadron spectra can beachieved within an arrow range of the energy loss parametersepsilon_0=1.6-2.1 GeV/fm. Because of the flattening of the initial jetproduction spectra, high p_T dihadrons at the LHC energy are found to bemore robust as probes of the dense medium.

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  • Journal Name: Physical Review Letters; Journal Volume: 98; Related Information: Journal Publication Date: 25 May 2007

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  • Report No.: LBNL--62151
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevLett.98.212301 | External Link
  • Office of Scientific & Technical Information Report Number: 923204
  • Archival Resource Key: ark:/67531/metadc895528

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  • January 17, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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Zhang, Hanzhong; Owens, Joseph F.; Wang, Enke & Wang, Xin-Nian. Dihadron Tomography of High-Energy Nuclear Collisions inNext-to-Leading Order Perturbative QCD, article, January 17, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc895528/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.