scholarly journals Dispersion relation for hadronic light-by-light scattering: two-pion contributions

2017 ◽  
Vol 2017 (4) ◽  
Author(s):  
Gilberto Colangelo ◽  
Martin Hoferichter ◽  
Massimiliano Procura ◽  
Peter Stoffer
2018 ◽  
Vol 2018 (10) ◽  
Author(s):  
Martin Hoferichter ◽  
Bai-Long Hoid ◽  
Bastian Kubis ◽  
Stefan Leupold ◽  
Sebastian P. Schneider

1986 ◽  
Vol 77 ◽  
Author(s):  
P. V. Santos ◽  
L. Ley ◽  
J. Mebert ◽  
J. Koblinger

ABSTRACTWe have investigated the Raman and the phonon transmission spectra of a-Si:H/a-SiNx:H super lattices. At low wavenumbers, the Raman spectrum shows sharp peaks corresponding to the excitation of modes from the folded branches of the dispersion relation for longitudinal acoustic phonons propagating perpendicular to the layers. Energy gaps in the folded phonon dispersion occur at the center and at the boundary of the mini-Brillouin zone due to the differences in the acoustic impedances of the layers. The size of the lowest gaps was determined by light scattering. The phonon transmission spectra show transmission minima that we attribute to the frequency gaps in the dispersion of transversal acoustic phonons. The position and width of these minima are compared with the dispersion obtained from the Raman data.


2016 ◽  
Vol 118 ◽  
pp. 01030 ◽  
Author(s):  
Massimiliano Procura ◽  
Gilberto Colangelo ◽  
Martin Hoferichter ◽  
Peter Stoffer

2016 ◽  
Author(s):  
Gilberto Colangelo ◽  
Peter Stoffer ◽  
Martin Hoferichter ◽  
Massimiliano Procura

2015 ◽  
Vol 2015 (9) ◽  
Author(s):  
Gilberto Colangelo ◽  
Martin Hoferichter ◽  
Massimiliano Procura ◽  
Peter Stoffer

1996 ◽  
Vol 88 (3) ◽  
pp. 683-691 ◽  
Author(s):  
P. KAATZ ◽  
D.P. SHELTON

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