Search for pair production of the scalar top quark in muon+tau final states

TL;DR

This paper searches for pair production of scalar top quarks in muon+tau final states at the Fermilab Tevatron, setting limits on their masses based on data analysis with no significant excess observed.

Contribution

First search for scalar top quark pair production in muon+tau final states at the Tevatron, providing new exclusion limits on their masses.

Findings

No significant excess observed above background

Set exclusion limits on ($m_{\tilde{t}_1}$, $m_{\tilde{ u}}$) parameter space

Analyzed 7.3 fb^{-1} of data with the D0 detector

Abstract

We present a search for the pair production of scalar top quarks ($\tilde{t}_{1}$), the lightest supersymmetric partners of the top quarks, in $p\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of {7.3 $fb^{-1}$} collected with the \dzero experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\tilde{\nu}$). We investigate final states arising from $\tilde{t}_{1} \bar{\tilde{t}_{1}} \rightarrow b\bar{b}\mu\tau \tilde{\nu} \tilde{\nu}$ and $\tilde{t}_{1} \bar{\tilde{t}_{1}} \rightarrow b\bar{b}\tau\tau \tilde{\nu} \tilde{\nu}$. With no significant excess of events observed above the background expected from the standard model, we set exclusion limits on this production process in the ($m_{\tilde{t}_{1}}$,$m_{\tilde{\nu}}$) plane.