dorsal/arxiv
View SchemaProduction of strange particles at intermediate pT at RHIC
| Authors | Rudolph C. Hwa, C. B. Yang |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0602024 |
| URL | https://arxiv.org/abs/nucl-th/0602024 |
| DOI | 10.1103/PhysRevC.75.054904 |
Abstract
The recombination model is applied to the production of $K, \phi, \Lambda$ and $\Omega$ at all $p_T$ in central Au+Au collisions. The thermal-shower component of the recombination is found to be important for $K$ and $\Lambda$, but only in a minor way for $\phi$ and $\Omega$ in the intermediate to high $p_T$ region. The normalization and inverse slope of the thermal partons in the strange sector are determined by fitting the low-$p_T$ data. At higher $p_T$ the data of $K, \phi, \Lambda$ and $\Omega$ in the log scale are all well reproduced in our study that extends the thermal contribution and includes the shower contribution. The calculated result on the $\Lambda/K$ ratio rises to a maximum of around 2 at $p_T\approx 4$ GeV/c, arching over the data in linear scale. The production of $\phi$ and $\Omega$ are shown to arise mainly from the recombination of thermal partons, thus exhibiting exponential $p_T$ dependences in agreement with the data. Their ratio, $R_{\Omega/\phi}$, rises linearly to $p_T\approx 4$ GeV/c and develops a maximum at $p_T\approx 5.5$ GeV/c. It is argued that the $p_T$ spectra of $\phi$ and $\Omega$ reveal directly the partonic nature of the thermal source that characterizes quark-gluon plasma. Comments are made on the $\Omega$ puzzle due to the simultaneous observation of both the exponential behavior of the $\Omega$ spectrum in $p_T$ and the existence of low-$p_T$ particles associated with $\Omega$ as trigger.
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"abstract": "The recombination model is applied to the production of $K, \\phi, \\Lambda$\nand $\\Omega$ at all $p_T$ in central Au+Au collisions. The thermal-shower\ncomponent of the recombination is found to be important for $K$ and $\\Lambda$,\nbut only in a minor way for $\\phi$ and $\\Omega$ in the intermediate to high\n$p_T$ region. The normalization and inverse slope of the thermal partons in the\nstrange sector are determined by fitting the low-$p_T$ data. At higher $p_T$\nthe data of $K, \\phi, \\Lambda$ and $\\Omega$ in the log scale are all well\nreproduced in our study that extends the thermal contribution and includes the\nshower contribution. The calculated result on the $\\Lambda/K$ ratio rises to a\nmaximum of around 2 at $p_T\\approx 4$ GeV/c, arching over the data in linear\nscale. The production of $\\phi$ and $\\Omega$ are shown to arise mainly from the\nrecombination of thermal partons, thus exhibiting exponential $p_T$ dependences\nin agreement with the data. Their ratio, $R_{\\Omega/\\phi}$, rises linearly to\n$p_T\\approx 4$ GeV/c and develops a maximum at $p_T\\approx 5.5$ GeV/c. It is\nargued that the $p_T$ spectra of $\\phi$ and $\\Omega$ reveal directly the\npartonic nature of the thermal source that characterizes quark-gluon plasma.\nComments are made on the $\\Omega$ puzzle due to the simultaneous observation of\nboth the exponential behavior of the $\\Omega$ spectrum in $p_T$ and the\nexistence of low-$p_T$ particles associated with $\\Omega$ as trigger.",
"arxiv_id": "nucl-th/0602024",
"authors": [
"Rudolph C. Hwa",
"C. B. Yang"
],
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"doi": "10.1103/PhysRevC.75.054904",
"title": "Production of strange particles at intermediate pT at RHIC",
"url": "https://arxiv.org/abs/nucl-th/0602024"
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