In this paper, we investigate the effects of the radion on γγ → γγ processes. From these, we point out a few remarkable properties of this process at high energy, which should allow one to search for effects of radion interactions. Interestingly, the cross-section with radion effect should be about 10 20 times larger than the one without radion effects.A warped extra dimension model proposed by Randall and Sundrum 1 predicts an extra scalar particle beyond the Standard Model which is called a radion. Very recently, in Refs. 2 and 3 the authors have studied production and decay of the radion in a photon collider, which has been proposed as an option for the e + e − linear collider (ILC). They have shown that a photon collider has excellent potential to search for the radion in the low-mass region.In Refs. 4 and 5 the photon-photon scattering via unparticle exchanges has been considered.In this paper, we investigate the effects of the radion on γγ → γγ process. This scattering is described by the Feynman diagrams presented in Fig. 1.The interaction vertex of γ(p 1 , μ) − γ(p 2 , ν) − φ is given byWe can write the amplitude for the process as† Corresponding author 1550095-1
In this paper, we investigate the possible unparticle signatures through Bhabha scattering. The numerical results show that the angular distribution with unparticle effects can be up to 42% of the one that is confirmed by Born QED and Born + 1-loop QED calculation and the total cross section with unparticle effects are about 0.04-4.24 pico barn. This could have important implications for unparticle searches and for the measurement of the cross section of the Bhabha scattering.
Randal-Sundrum models have an interesting feature that an effective physical scale can be generated from a much larger one of the underlying theory. In this paper, we investigate a model of supersymmetry in the Randall-Sundrum spacetime with a low cutoff scale. Due to the warp factor, the Kaluza-Klein scale is warped down to \(\mathcal{O}\)(100) TeV. With the MSSM superfields living in the bulk, the soft SUSY breaking terms of the 4D effective theory are derived from the original 5D Lagrangian by integrating out the extra-dimension. We examine the constraint of the Higgs boson mass measurement on the model. As a result, the viable parameter space with the ability to reproduce a 125 GeV Higgs mass is identified. The constraint rules out parameter regions with the stop masses larger than 20 TeV. Therefore, the parameter space of the model can be explored in a future 100 TeV collider.
Germanene is a two-dimensional system made of germanium atoms, its configuration is hexagonal honeycomb. Germanene nanoribbons (GNRs) are one-dimensional systems made from germanene with hydrogen-modified edges. The GNRs configuration studied here consists of 12 germanium atoms and 4 hydrogen atoms per unit cell. This work investigated the doping of two boron atoms into the unit cell of GNRs. Changing the different doping sites produces different configurations, the configurations been studied as meta-configuration, para-configuration, and ortho-configuration. By using density functional theory (DFT), the formation energies, energy band structures, and density of states of the configurations are studied. The ortho-configuration for the formation energy is the smallest, so this configuration is the most stable. The appearance of an external electric field changes the band gap and the energy band structure of the system.
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