dorsal/arxiv
View SchemaSystematic Study of High p_T Hadron Spectra in pp, pA and AA Collisions from SPS to RHIC Energies
| Authors | Xin-Nian Wang |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9812021 |
| URL | https://arxiv.org/abs/nucl-th/9812021 |
| DOI | 10.1103/PhysRevC.61.064910 |
| Journal | Phys.Rev.C61:064910,2000 |
Abstract
High-$p_T$ particle spectra in $p+p$ ($\bar p + p$), $p+A$ and $A+B$ collisions are calculated within a QCD parton model in which intrinsic transverse momentum, its broadening due to initial multiple parton scattering, and jet quenching due to parton energy loss inside a dense medium are included phenomenologically. The intrinsic $k_T$ and its broadening in $p+A$ and $A+B$ collisions due to initial multiple parton scattering are found to be very important at low energies ($\sqrt{s}<50$ GeV). Comparisons with $S+S$, $S+Au$ and $Pb+Pb$ data with different centrality cuts show that the differential cross sections of large transverse momentum pion production ($p_T>1$ GeV/$c$) in $A+B$ collisions scale very well with the number of binary nucleon-nucleon collisions (modulo effects of multiple initial scattering). This indicates that semi-hard parton scattering is the dominant particle production mechanism underlying the hadron spectra at moderate $p_T \stackrel{>}{\sim} 1$ GeV/$c$. However, there is no evidence of jet quenching or parton energy loss. Within the parton model, one can exclude an effective parton energy loss $dE_q/dx>0.01$ GeV/fm and a mean free path $\lambda_q< 7$ fm from the experimental data of $A+B$ collisions at the SPS energies. Predictions for high $p_T$ particle spectra in $p+A$ and $A+A$ collisions with and without jet quenching at the RHIC energy are also given. Uncertainties due to initial multiple scattering and nuclear shadowing of parton distributions are also discussed.
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"abstract": "High-$p_T$ particle spectra in $p+p$ ($\\bar p + p$), $p+A$ and $A+B$\ncollisions are calculated within a QCD parton model in which intrinsic\ntransverse momentum, its broadening due to initial multiple parton scattering,\nand jet quenching due to parton energy loss inside a dense medium are included\nphenomenologically. The intrinsic $k_T$ and its broadening in $p+A$ and $A+B$\ncollisions due to initial multiple parton scattering are found to be very\nimportant at low energies ($\\sqrt{s}\u003c50$ GeV). Comparisons with $S+S$, $S+Au$\nand $Pb+Pb$ data with different centrality cuts show that the differential\ncross sections of large transverse momentum pion production ($p_T\u003e1$ GeV/$c$)\nin $A+B$ collisions scale very well with the number of binary nucleon-nucleon\ncollisions (modulo effects of multiple initial scattering). This indicates that\nsemi-hard parton scattering is the dominant particle production mechanism\nunderlying the hadron spectra at moderate $p_T \\stackrel{\u003e}{\\sim} 1$ GeV/$c$.\nHowever, there is no evidence of jet quenching or parton energy loss. Within\nthe parton model, one can exclude an effective parton energy loss\n$dE_q/dx\u003e0.01$ GeV/fm and a mean free path $\\lambda_q\u003c 7$ fm from the\nexperimental data of $A+B$ collisions at the SPS energies. Predictions for high\n$p_T$ particle spectra in $p+A$ and $A+A$ collisions with and without jet\nquenching at the RHIC energy are also given. Uncertainties due to initial\nmultiple scattering and nuclear shadowing of parton distributions are also\ndiscussed.",
"arxiv_id": "nucl-th/9812021",
"authors": [
"Xin-Nian Wang"
],
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"doi": "10.1103/PhysRevC.61.064910",
"journal_ref": "Phys.Rev.C61:064910,2000",
"title": "Systematic Study of High p_T Hadron Spectra in pp, pA and AA Collisions from SPS to RHIC Energies",
"url": "https://arxiv.org/abs/nucl-th/9812021"
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