dc.creator | Majumder, A. | |
dc.creator | Fries, Rainer J. | |
dc.creator | Mueller, B. | |
dc.date.accessioned | 2011-09-13T21:27:43Z | |
dc.date.available | 2011-09-13T21:27:43Z | |
dc.date.issued | 2008 | |
dc.identifier.citation | A. Majumder, Rainer J. Fries and B. Mueller. Phys.Rev.C 77 065209 2008. "Copyright (2008) by the American Physical Society." | en |
dc.identifier.uri | http://dx.doi.org/10.1103/PhysRevC.77.065209 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/127063 | |
dc.description | Journals published by the American Physical Society can be found at http://publish.aps.org/ | en |
dc.description.abstract | The photon bremsstrahlung rate from a quark jet produced in deep-inelastic scattering (DIS) off a large nucleus is studied in the collinear limit. The leading medium-enhanced higher twist corrections that describe the multiple scattering of the jet in the nucleus are re-summed to all orders of twist. The propagation of the jet in the absence of further radiative energy loss is shown to be governed by a transverse momentum diffusion equation. We compute the final photon spectrum in the limit of soft photons, taking into account the leading and next-to-leading terms in the photon momentum fraction y. In this limit, the photon spectrum in a physical gauge is shown to arise from two interfering sources: one where the initial hard scattering produces an off-shell quark, which immediately radiates the photon and then undergoes subsequent soft rescattering, and an alternative in which the quark is produced on-shell and propagates through the medium until it is driven off-shell by rescattering and radiates the photon. Our result has a simple formal structure as a product of the photon splitting function, the quark transverse momentum distribution coming from a diffusion equation, and a dimensionless factor that encodes the effect of the interferences encountered by the propagating quark over the length of the medium. The destructive nature of such interferences in the small-y limit is responsible for the origin of the Landau-Pomeranchuck-Migdal (LPM) effect. Along the way we also discuss possible implications for quark jets in hot nuclear matter. | en |
dc.language.iso | en | |
dc.publisher | American Physical Society | |
dc.subject | MULTIPLE PARTON SCATTERING | en |
dc.subject | RADIATIVE ENERGY-LOSS | en |
dc.subject | QUARK-GLUON PLASMA | en |
dc.subject | HEAVY-ION COLLISIONS | en |
dc.subject | NUCLEAR ENVIRONMENT | en |
dc.subject | HADRONIC SCATTERING | en |
dc.subject | TRANSVERSE-MOMENTUM | en |
dc.subject | POWER CORRECTIONS | en |
dc.subject | MATTER | en |
dc.subject | QCD | en |
dc.subject | Physics | en |
dc.title | Photon bremsstrahlung and diffusive broadening of a hard jet | en |
dc.type | Article | en |
local.department | Physics and Astronomy | en |