dorsal/arxiv
View SchemaLPM Interference and Cherenkov-like Gluon Bremsstrahlung in Dense Matter
| Authors | A. Majumder, Xin-Nian Wang |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0507062 |
| URL | https://arxiv.org/abs/nucl-th/0507062 |
| DOI | 10.1103/PhysRevC.73.051901 |
| Journal | Phys.Rev.C73:051901,2006 |
Abstract
Gluon bremsstrahlung induced by multiple parton scattering in a finite dense medium has a unique angular distribution with respect to the initial parton direction. A dead-cone structure with an opening angle $\theta^2_0 \approx 2(1-z)/(zLE)$ for gluons with fractional energy $z$ arises from the Landau-Pomeranchuck-Migdal (LPM) interference. In a medium where the gluon's dielectric constant is $\epsilon >1$, the LPM interference pattern is shown to become Cherenkov-like with an increased opening angle determined by the dielectric constant $\cos^2\theta_c=z+(1-z)/\epsilon$. For a large dielectric constant $\epsilon \gg 1+2/z^2LE$, the corresponding total radiative parton energy loss is about twice that from normal gluon bremsstrahlung. Implications of this Cherenkov-like gluon bremsstrahlung to the jet correlation pattern in high-energy heavy-ion collisions is discussed.
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"abstract": "Gluon bremsstrahlung induced by multiple parton scattering in a finite dense\nmedium has a unique angular distribution with respect to the initial parton\ndirection. A dead-cone structure with an opening angle $\\theta^2_0 \\approx\n2(1-z)/(zLE)$ for gluons with fractional energy $z$ arises from the\nLandau-Pomeranchuck-Migdal (LPM) interference. In a medium where the gluon\u0027s\ndielectric constant is $\\epsilon \u003e1$, the LPM interference pattern is shown to\nbecome Cherenkov-like with an increased opening angle determined by the\ndielectric constant $\\cos^2\\theta_c=z+(1-z)/\\epsilon$. For a large dielectric\nconstant $\\epsilon \\gg 1+2/z^2LE$, the corresponding total radiative parton\nenergy loss is about twice that from normal gluon bremsstrahlung. Implications\nof this Cherenkov-like gluon bremsstrahlung to the jet correlation pattern in\nhigh-energy heavy-ion collisions is discussed.",
"arxiv_id": "nucl-th/0507062",
"authors": [
"A. Majumder",
"Xin-Nian Wang"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.73.051901",
"journal_ref": "Phys.Rev.C73:051901,2006",
"title": "LPM Interference and Cherenkov-like Gluon Bremsstrahlung in Dense Matter",
"url": "https://arxiv.org/abs/nucl-th/0507062"
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