dorsal/arxiv
View SchemaAzimuthal flow of decay photons in relativistic nuclear collisions
| Authors | Biswanath Layek, Rupa Chatterjee, Dinesh K. Srivastava |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0605019 |
| URL | https://arxiv.org/abs/nucl-th/0605019 |
| DOI | 10.1103/PhysRevC.74.044901 |
| Journal | Phys.Rev. C74 (2006) 044901 |
Abstract
An overwhelming fraction of photons from relativistic heavy ion collisions has its origin in the decay of $\pi^0$ and $\eta$ mesons. We calculate the azimuthal asymmetry of the decay photons for several azimuthally asymmetric pion distributions. We find that the $k_T$ dependence of the elliptic flow parameter$v_2$ for the decay photons closely follows the elliptic flow parameter $v_2^{\pi^0}$ evaluated at $p_T \approx k_T+\delta$, where $\delta\approx$ 0.1 -- 0.2 GeV, for typical pion distributions measured in nucleus-nucleus collisions at relativistic energies. Similar results are obtained for photons from the 2-$\gamma$ decay of $\eta$ mesons. Assuming that the flow of $\pi^0$ is similar to those for $\pi^+$ and $\pi^-$ for which independent measurements would be generally available, this ansatz can help in identifying additional sources for photons. Taken along with quark number scaling suggested by the recombination model, it may help to estimate $v_2$ of the parton distributions in terms of azimuthal asymmetry of the decay photons at large $k_T$.
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"abstract": "An overwhelming fraction of photons from relativistic heavy ion collisions\nhas its origin in the decay of $\\pi^0$ and $\\eta$ mesons. We calculate the\nazimuthal asymmetry of the decay photons for several azimuthally asymmetric\npion distributions. We find that the $k_T$ dependence of the elliptic flow\nparameter$v_2$ for the decay photons closely follows the elliptic flow\nparameter $v_2^{\\pi^0}$ evaluated at $p_T \\approx k_T+\\delta$, where\n$\\delta\\approx$ 0.1 -- 0.2 GeV, for typical pion distributions measured in\nnucleus-nucleus collisions at relativistic energies. Similar results are\nobtained for photons from the 2-$\\gamma$ decay of $\\eta$ mesons. Assuming that\nthe flow of $\\pi^0$ is similar to those for $\\pi^+$ and $\\pi^-$ for which\nindependent measurements would be generally available, this ansatz can help in\nidentifying additional sources for photons. Taken along with quark number\nscaling suggested by the recombination model, it may help to estimate $v_2$ of\nthe parton distributions in terms of azimuthal asymmetry of the decay photons\nat large $k_T$.",
"arxiv_id": "nucl-th/0605019",
"authors": [
"Biswanath Layek",
"Rupa Chatterjee",
"Dinesh K. Srivastava"
],
"categories": [
"nucl-th",
"hep-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.74.044901",
"journal_ref": "Phys.Rev. C74 (2006) 044901",
"title": "Azimuthal flow of decay photons in relativistic nuclear collisions",
"url": "https://arxiv.org/abs/nucl-th/0605019"
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