In the high-energy region, the photons have been absorbed again because the predominant interaction process is the pair production
. The EBF and EABF results of GAGCO and CMO observe sharp peaks at 20 and 60 keV which may be attributed to K-absorption edges of Mo and Gd, respectively.
4 Quark Annihilation and Pair Production
: Neutrino Oscillation
 ATLAS Collaboration, "Measurements of integrated and differential cross sections for isolated photon pair production
in pp collisions at [square root of s] = 8 TeV with the ATLAS detector," Physical Review D, vol.
 The ATLAS Collaboration, "Search for pair production
of Higgs bosons in the bbbb final state using proton-proton collisions at s =13 TeV with the ATLAS detector," ATLAS-CONF-049, 2016.
Ramalho, "Virtual excited neutrino exchange in W boson pair production
," Physical Review D, vol.
These processes include Higgs associating with T-even top partner pair production
[e.sup.+][e.sup.-] [right arrow] [T.sub.+][[bar.T].sub.+]H, Higgs associating with T-odd top partner pair production
[e.sup.+][e.sup.-] [right arrow] [T.sub.- ][[bar.T].sub.-]H, and Higgs associating with a top quark and a T-even top partner production [e.sup.+][e.sup.-] [right arrow] t[[bar.T].sub.+]H.
As shown in Figure 4, the charged Higgs pair production
may proceed through three types of diagrams.
In particular, it is necessary to generalize the pair production
threshold to the creation of a tachyonic neutrino-antineutrino pair.
When it is stretched to reach the pair production
threshold, a further pair is formed, and so on [31, 32].
In Figure 1, we show the top pair production
cross section times branching ratios of one top decays anomalously into q + g and another one decays leptonically (electron and muon) as well as the top pair production
cross section times the branching ratios of both tops decay anomalously into q + g.