dorsal/arxiv
View SchemaKaon squeeze-out in heavy ion reactions
| Authors | Z. S. Wang, C. Fuchs, Amand Faessler, T. Gross-Boelting |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9809043 |
| URL | https://arxiv.org/abs/nucl-th/9809043 |
| Journal | Eur.Phys.J. A5 (1999) 275-283 |
Abstract
The squeeze-out phenomenon of $K^+$ and $K^-$ mesons, i.e. the azimuthal asymmetry of $K^+$ and $K^-$ mesons emitted at midrapidity in heavy ion reactions, is investigated for beam energies of 1-2 A.GeV. It is found that the squeeze-out signal is strongly affected by in-medium potentials of these mesons. The repulsive $K^+$-nucleus potential gives rise to a pronounced out-of-plane emission of $K^+$'s at midrapidity. With the $K^+$ potential we reproduce well the experimental data of the $K^+$ azimuthal distribution. It is found that the attractive $K^-$-nucleus potential cancels to a large extent the influence of rescattering and reabsorption of the $K^-$ mesons on the projectile and target residuals (i.e. shadowing). This results in an azimuthally isotropic emission of the midrapidity $K^-$ mesons with transverse momentum up to 0.8 GeV/c. Since it is well accepted that the shadowing alone would lead to a significant out-of-plane preference of particle emission, in particular at high transverse momenta, the disappearance of the out-of-plane preference for the $K^-$ mesons can serve as an unambiguous signal of the attractive $K^-$ potential. We also apply a covariant formalism of the kaon dynamics to the squeeze-out phenomenon. Discrepancies between the theory and the experiments and possible solutions are discussed.
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"abstract": "The squeeze-out phenomenon of $K^+$ and $K^-$ mesons, i.e. the azimuthal\nasymmetry of $K^+$ and $K^-$ mesons emitted at midrapidity in heavy ion\nreactions, is investigated for beam energies of 1-2 A.GeV. It is found that the\nsqueeze-out signal is strongly affected by in-medium potentials of these\nmesons. The repulsive $K^+$-nucleus potential gives rise to a pronounced\nout-of-plane emission of $K^+$\u0027s at midrapidity. With the $K^+$ potential we\nreproduce well the experimental data of the $K^+$ azimuthal distribution. It is\nfound that the attractive $K^-$-nucleus potential cancels to a large extent the\ninfluence of rescattering and reabsorption of the $K^-$ mesons on the\nprojectile and target residuals (i.e. shadowing). This results in an\nazimuthally isotropic emission of the midrapidity $K^-$ mesons with transverse\nmomentum up to 0.8 GeV/c. Since it is well accepted that the shadowing alone\nwould lead to a significant out-of-plane preference of particle emission, in\nparticular at high transverse momenta, the disappearance of the out-of-plane\npreference for the $K^-$ mesons can serve as an unambiguous signal of the\nattractive $K^-$ potential. We also apply a covariant formalism of the kaon\ndynamics to the squeeze-out phenomenon. Discrepancies between the theory and\nthe experiments and possible solutions are discussed.",
"arxiv_id": "nucl-th/9809043",
"authors": [
"Z. S. Wang",
"C. Fuchs",
"Amand Faessler",
"T. Gross-Boelting"
],
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"nucl-th"
],
"journal_ref": "Eur.Phys.J. A5 (1999) 275-283",
"title": "Kaon squeeze-out in heavy ion reactions",
"url": "https://arxiv.org/abs/nucl-th/9809043"
},
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