Top-quark decay via R-parity violating interactions at the Tevatron

TL;DR

This paper investigates the potential to detect R-parity violating top-quark decays at the Tevatron collider, providing bounds on the coupling strength and exploring the observability of these exotic decay channels.

Contribution

It introduces a detailed analysis of R-parity violating top-quark decays and estimates the sensitivity of Tevatron data to these processes, extending current bounds.

Findings

Existing Tevatron data set a 95% CL upper bound on the coupling.

Tevatron Run II can improve bounds significantly with more data.

Potential to surpass current indirect limits on R-parity violating couplings.

Abstract

We consider the top-quark decay $t\to \tilde \tau b$ and $t\to \tau b \tilde{\chi}^0_1$ via explicit R-parity violating interactions in SUSY theories. We discuss the observability of those channels at the Fermilab Tevatron collider. The existing Tevatron data indicate a 95% confidence level upper bound on the coupling to be less than 0.94(0.63) for a long-lived (short-lived) $\tilde{\chi}^0_1$ with $m_{\tilde\tau}=70$ GeV. At Tevatron Run II with an integrated luminosity of 2 (10) fb$^{-1}$, one can obtain a 2$\sigma$ constraint as 0.38 (0.24) for a long-lived $\tilde{\chi}^0_1$ and 0.29(0.19) for a short-lived $\tilde{\chi}^0_1$, beyond the current indirect limit.