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Landau–Yang theorem

Known as: Landau-Yang theorem 
In quantum mechanics, the Landau–Yang theorem is a selection rule for particles that decay into two photons. The theorem states that a massive… 
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Papers overview

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2018
2018
In this work we show how a double-cover (DC) extension of the Cachazo, He and Yuan formalism (CHY) can be used to provide a new… 
2012
2012
We calculate the Chern-Simons diffusion rate in a strongly coupled N=4 SUSY Yang-Mills plasma in the presence of a constant… 
2006
2006
In this paper we present different possibilities like QSSPC lifetime measurements, X-ray diffraction and defect etch to measure… 
2006
2006
Abstract A new Oriental fishfly genus, Sinochauliodesgen.n., is described, including four species: S. fujianensis ( Yang & Yang… 
2004
2004
We determine the exact vacuum structure of a marginal deformation of N = 4 SUSY Yang-Mills with gauge group U(N). The Coulomb… 
1999
1999
Based on closed orbit theory, we derive a simple analytic formula for the photodetachment cross section of H- in a gradient… 
1991
1991
Langmuir is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Large scale hexagonal… 
1991
1991
Connected components detection and labeling is an essential step in many image analysis techniques. The efficiency of the…