Search

We calculate the complete next-to-leading order (NLO) QCD corrections to the -odd mirror quark pair , , , production in the littlest Higgs model with -parity (LHT) at a high energy collider. We present the dependence of the leading order (LO) and NLO QCD corrected cross sections on the colliding energy . Our calculation includes the subsequent full weak decays of the final -odd mirror quarks by adopting the narrow width approximation and the exclusive 2-jet event selection criterion. We provide the LO and QCD NLO kinematic distributions of final particles. We find that the NLO QCD correction is phase space dependent and modifies the LO cross section evidently. The -factor increases noticeably when approaches the threshold of the on-shell -pair production. We conclude that it is possible to separate the signature of the -odd quark pair production from possible Standard Model (SM) background by taking proper kinematic cut. [ABSTRACT FROM AUTHOR]

In this paper, we investigated the neutronics performance of uranium carbide (UC), uranium nitride (UN) and uranium dioxide (UO2) monolith targets and granular targets by using GPU-based Monte Carlo particle transport program (GMT). Effects of the target thickness and diameter on leaked neutron yield of monolith targets irradiated by 1 GeV protons were studied; the leaked neutron yield and neutron spectra for the dense granular uranium compounds and UC-kernel TRISO type targets were presented. Results show that, with an optimal dimension ϕ 25 × 50 cm , uranium compounds target can produce 40% more leaked neutron yield than the tungsten target. Results also show that by 1 GeV protons incident on, our designed carbon and SiC layers coated UC-kernel TRISO type pellets target with about 70% kernel volume fraction can produce about 30% more leaked neutron yield than the granular tungsten target in their optimal diameters. [ABSTRACT FROM AUTHOR]