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in the medium (the average distance between scattering sites) then the scatterings can no longer be treated as independent events, this is the LPM effect. The Bethe–Heitler spectrum for multiple scattering induced radiation assumes that the scatterings are independent, the quantum interference
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sites. From uncertainty as the longitudinal momentum transfer gets small the particles wavelength will increase, if the wavelength becomes longer than the
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between successive scatterings caused by the LPM effect leads to suppression of the radiation spectrum relative to that predicted by Bethe–Heitler.
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Landau, L.D.; Pomeranchuk, I. (1953). "Limits of applicability of the theory of bremsstrahlung electrons and pair production at high-energies".
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and interact with the medium also. Since the gluons are soft their rescattering will provide the dominant modification to the spectrum.
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energies are suppressed. In QED the rescattering of the high energy electron dominates the process, in QCD the emitted gluons carry
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A high energy particle undergoing multiple soft scatterings from a medium will experience interference effects between adjacent
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Anthony, P.L.; Becker-Szendy, R.; Bosted, P.E.; Cavalli-Sforza, M.; Keller, L.P.; Kelley, L.A.; Klein, S.R.; Niemi, G.;
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developed a formula applicable at high energies or high matter densities which accounted for these effects.
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Aurenche, P.; Gelis, F.; Zaraket, H. (2000). "Landau-Pomeranchuk-Migdal effect in thermal field theory".
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Migdal, A.B. (1956). "Bremsstrahlung and pair production in condensed media at high-energies".
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by neighboring atoms reduces the cross sections for pair production and bremsstrahlung.
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The suppression occurs in different parts of the emission spectrum, for
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at high energies or high matter densities. It is named in honor of
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experimentally confirmed the Landau–Pomeranchuk–Migdal effect.
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