On the General Theory of Collisions for Particles with Spin

Specific supersimple properties ofe−e+→γHat high energy

“…Since in this example, determined by (17,18), CP is also violated, the BSM contributions violate the restriction (9).…”

“…The scalar functions N i=1,3,4 (s, t), N ′ 1 (s, t) are obtained by computation of specific diagrams. One then gets the corresponding helicity amplitudes F λ,τ (s, θ) by usual expansion of the Dirac spinors appearing in the forms (4,5), using the standard Jacob-Wick conventions [18]; note that τ = ±1 and that…”

Neutralino-neutralino annihilation toγZin MSSM

“…Such a process could be studied in a future e ∓ γ Linear Collider, providing further constraints on neutralinos and DM. It is straightforward to get the amplitudes for (13), from those of the process (11), studied here. We hope to present results for this in the future.…”

“…Generally, the incoming neutralinos may be different. The corresponding helicity amplitudes, satisfying the standard Jacob-Wick conventions [13], are denoted as…”

“…scattering angle of the outgoing photon with respect to the incoming neutralinoχ 0 i . According to [13], the χ 0 i χ 0 j antisymmetry due to the fermionic nature of the neutralinos, obliges the helicity amplitudes to obey…”