LPM Interference and Cherenkov-like Gluon Bremsstrahlung in Dense Matter

Details LPM Interference and Cherenkov-like Gluon Bremsstrahlung in Dense Matter LPM Interference and Cherenkov-like Gluon Bremsstrahlung in Dense Matter

2005-07-26

arxiv.org/abs/nucl-th/0507062v3

Phys.Rev. C73 (2006) 051901

Physics

Nuclear Physics

Nuclear Theory

4 pages in RevTEx with 1 postscript figure

Scientific paper

10.1103/PhysRevC.73.051901

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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