R-parity violation effect on the top-quark pair production at linear colliders

Abstract

We investigate in detail the effects of the R-parity lepton number violation in the minimal supersymmetric standard model (MSSM) on the top-quark pair production via both $e^{-}-e^{+}$ and $\gamma -\gamma$ collision modes at the linear colliders. We find that with the present experimental constrained $\text{/}R$ parameters, the effect from $\text{/}R$ interactions on the processes $e^{+}{e}^{-}\to t\bar{t}$ and $e^{+}{e}^{-}\to \gamma \gamma \to t\bar{t}$ could be significant and may reach -30% and several percent, respectively. Our results show that the $\text{/}R$ effects are sensitive to the c.m.s. energy and the relevant $\text{/}R$ parameters. However, they are not sensitive to squark and slepton masses when $m_{\tilde{q}}\ge 400GeV$ (or $m_{\tilde{l}}\ge 300GeV$) and are almost independent on the $\tan \beta$

Comments: Accepted by Phys.Rev.D