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

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 $f{b}^{-1}$} 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 ${\tilde{t}}_1\overline{{\stackrel{~}{t}}_1}\to b\bar{b}\mu \tau \tilde{\nu }\tilde{\nu }$ and ${\tilde{t}}_1\overline{{\stackrel{~}{t}}_1}\to b\bar{b}\tau \tau \tilde{\nu }\tilde{\nu }$. 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.

Submitted to Phys. Lett. B

References in corpus (5)

• Design and Implementation of the New D0 Level-1 Calorimeter Trigger
• Search for scalar top quarks in the acoplanar charm jets and missing transverse energy final state in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Measurement of the ttbar production cross section in pbarp collisions at sqrt(s) = 1.96 TeV using secondary vertex b tagging
• Measurement of sigma(ppbar -> Z + X) Br(Z -> tau+tau-) at sqrt(s)=1.96 TeV
• Search for pair production of the scalar top quark in the electron-muon final state

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• Model-Independent Bounds on Squarks from Monophoton Searches
• Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at sqrt(s) = 8 TeV
• Performance and optimization of support vector machines in high-energy physics classification problems
• Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at sqrt(s) = 8 TeV
• Measurement of the $W+b$-jet and $W+c$-jet differential production cross sections in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV