Neutralino pair production via photon-photon collisions at the ILC

Abstract

We provide complete one-loop predictions for the direct production of the neutralino pairs via photon-photon collisions which appears for the first time at one-loop level in the minimal supersymmetric standard model at the International Linear Collider. We present a comprehensive investigation of the dependence of total cross section on the center-of-mass energy and the tan$\beta$ for three different scenarios based on gaugino/Higgsino fractions of the neutralinos. Furthermore, by investigating the behavior with the most relevant parameters $\mu$ and $M_2$, we exhibit regions of the parameter space where the enhancement of the cross section is large enough to be detectable at linear colliders. Our analysis shows that the corresponding production cross section reaches its highest values when the lightest neutralino ${\tilde{\chi }}_1^0$ has a dominant Higgsino component and/or the next-to-lightest neutralino ${\tilde{\chi }}_2^0$ has a dominant gaugino component.

arXiv comment13 pages, 12 figures, 3 tables

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