Dominance of electromagnetic effects in high energy hadron and photon induced reaction

SU(3)F analysis for beauty baryon decays

“…We see from the lattice results in Table VII that this is the case for θ m . Very generally, at high energy scales electromagnetic interactions will dominate over QCD ones [123].…”

Radiative Decay Width Measurements of Neutral Kaon Excitations Using the Primakoff Effect

“…We also use the K S π 0 channel to place the first upper limit on Γ r (K * (1410)) and a stringent upper limit on Γ r (K * 2 (1430)). For high particle energies and small production angles, the rate of exciting a K L to a K * in the Coulomb field of a nucleus A is given by [10] …”

Pion and sigma polarizabilities and radiative transitions

“…and the strong background cross section was 0.75 µb; which gives a signal to background ratio of 3. The hadronic cross section falls [12,28] as 1/E (factor=1/3.8), while the Primakoff cross section rises as ln(E) (factor = 1.3). In addition, the Primakoff cross section has a coefficient K, given by:…”

“…The sources of these backgrounds are the coherent process of pion elastic scattering accompanied by gamma emission [44], contributions of pion (or rho) rescattering [42,45], and higher cross section inelastic channels [27,46]. Available calculations and data show that these backgrounds are manageable, and that the signal to background improves [12,28,44] with increasing incident energy.…”

“…The SELEX t-resolution will be 10 times worse. The strong backgrounds are associated with particle exchange, and such cross sections are known [12,27,28,44] to fall rapidly with increasing energy. From this point of view, the t-resolution is therefore not a critical parameter for 600 GeV experiments.…”