Diffractive $\gamma \gamma$ production at hadron colliders

Soft Double–Diffractive Higgs Production at Hadron Colliders

We evaluate the non–perturbative contribution to the double–diffractive production of the Higgs boson, which arises due to the QCD scale anomaly if the mass of the Higgs MH is smaller than the mass of the top quark MT , MH < MT . The cross section appears to be larger than expected from perturbative calculations; we find σH = 0.019 ÷ 0.14 pbarn at the Tevatron energy, and σH = 0.01 ÷ 0.27 pbarn...

Gamma - Gamma , Gamma - Electron Colliders ∗

It is very likely that in 3-4 years the construction of one or two linear colliders with c.m.s energy up to 0.5–1.5 TeV will be started. Besides eecollisions, linear colliders give a unique possibility to study γγ and γe interactions at energies and luminosities comparable to those in ee collisions. High energy photons for γγ and γe collisions can be obtained using laser backscattering. These t...

Stop production at hadron colliders

Stop particles are expected to be the lightest squarks in supersymmetric theories and the search for these particles is an important experimental task. We therefore present the cross sections for the production processes pp̄/pp → t̃1t1 and t̃2t2 at Tevatron and LHC energies in next-to-leading order supersymmetric QCD. The corrections stabilize the theoretical predictions for the cross sections, an...

Bilepton Production at Hadron Colliders

We examine, as model-independently as possible, the production of bileptons at hadron colliders. When a particular model is necessary or useful, we choose the 3-3-1 model. We consider a variety of processes: qq̄ → Y Y −−, ud̄ → Y Y −, ūd → Y Y −−, qq̄ → Y ++e−e−, qq̄ → φ++φ−−, ud̄ → φ++φ−, and ūd → φ+φ−−, where Y and φ are vector and scalar bileptons, respectively. Given the present low-energy const...

Gamma - Gamma Colliders