منابع مشابه
A Search for New Particles Produced by High Energy Photons*
A search for new particle s which might be produced by photons of energy up to 18 GeV is described. No new particles were found. Calculations of the Beth&-Heitler process are described which make it possible to state that this exper.iment would have detected non-strongly interacting particles whose mass and lifetime lay in a definite range, did they exist.
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In hadron-nucleus interactions, the stronger is nuclear shadowing in the total cross section the higher is the multiplicity of secondary hadrons. In deep inelastic scattering, nuclear shadowing at small x is associated with the hadronlike behaviour of photons as contrasted to the pointlike behaviour in the non-shadowing region of large x. In this paper we predict smaller mean multiplicity of se...
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Considering the propagation of off-shell particles in the framework of thermal field theory, we present the general formalism for the calculation of the production rate of soft photons and dileptons from a hot plasma. This approach is illustrated with an electrodynamic plasma. The photon production rate from strongly interacting quarks in the quark-gluon plasma, which might be formed in ultrare...
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There is an asymmetry between the mass of the electric charges, for example proton and electron, can understood by the asymmetrical Planck Distribution Law. This temperature dependent energy distribution is asymmetric around the maximum intensity, where the annihilation of matter and antimatter is a high probability event. The asymmetric sides are creating different frequencies of electromagnet...
متن کاملMassive Hidden Photons as Lukewarm Dark Matter
We study the possibility that a keV-MeV mass hidden photon (HP), i.e. a hidden sector U(1) gauge boson, accounts for the observed amount of dark matter. We focus on the case where the HP interacts with the standard model sector only through kinetic mixing with the photon. The relic abundance is computed including all relevant plasma effects into the photon’s self-energy, which leads to a resona...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2008
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.77.043813