dorsal/arxiv
View SchemaDihadron Tomography of High-Energy Nuclear Collisions in NLO pQCD
| Authors | Hanzhong Zhang, J. F. Owens, Enke Wang, Xin-Nian Wang |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0701045 |
| URL | https://arxiv.org/abs/nucl-th/0701045 |
| DOI | 10.1103/PhysRevLett.98.212301 |
| Journal | Phys.Rev.Lett.98:212301,2007 |
Abstract
Back-to-back dihadron spectra in high-energy heavy-ion collisions are studied within the next-to-leading order (NLO) perturbative QCD parton model with jet quenching incorporated via modified jet fragmentation functions due to radiative parton energy loss in dense medium. The experimentally observed appearance of back-to-back dihadrons at high $p_T$ is found to originate mainly from jet pairs produced close and tangential to the surface of the dense matter. However, a substantial fraction of observed high $p_T$ dihadrons also comes from jets produced at the center of the medium after losing finite amount of energy. Consequently, the suppression factor of such high-$p_T$ hadron pairs is found to be more sensitive to the initial gluon density than the single hadron spectra that are dominated by surface emission. A simultaneous $\chi^2$-fit to both the single and dihadron spectra can be achieved within a narrow range of the energy loss parameters $\epsilon_0=1.6-2.1$ GeV/fm. Because of the flattening of the initial jet production spectra, high $p_T$ dihadrons at the LHC energy are found to be more robust as probes of the dense medium.
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"abstract": "Back-to-back dihadron spectra in high-energy heavy-ion collisions are studied\nwithin the next-to-leading order (NLO) perturbative QCD parton model with jet\nquenching incorporated via modified jet fragmentation functions due to\nradiative parton energy loss in dense medium. The experimentally observed\nappearance of back-to-back dihadrons at high $p_T$ is found to originate mainly\nfrom jet pairs produced close and tangential to the surface of the dense\nmatter. However, a substantial fraction of observed high $p_T$ dihadrons also\ncomes from jets produced at the center of the medium after losing finite amount\nof energy. Consequently, the suppression factor of such high-$p_T$ hadron pairs\nis found to be more sensitive to the initial gluon density than the single\nhadron spectra that are dominated by surface emission. A simultaneous\n$\\chi^2$-fit to both the single and dihadron spectra can be achieved within a\nnarrow range of the energy loss parameters $\\epsilon_0=1.6-2.1$ GeV/fm. Because\nof the flattening of the initial jet production spectra, high $p_T$ dihadrons\nat the LHC energy are found to be more robust as probes of the dense medium.",
"arxiv_id": "nucl-th/0701045",
"authors": [
"Hanzhong Zhang",
"J. F. Owens",
"Enke Wang",
"Xin-Nian Wang"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevLett.98.212301",
"journal_ref": "Phys.Rev.Lett.98:212301,2007",
"title": "Dihadron Tomography of High-Energy Nuclear Collisions in NLO pQCD",
"url": "https://arxiv.org/abs/nucl-th/0701045"
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