Search for Top Squarks at Tevatron Inspired by Dark Matter and Electroweak Baryogenesis

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dc.creatorBhattacharyya, Nabanita
dc.creatorDatta, Amitava
dc.creatorMaity, Manas
dc.date2008-07-07
dc.date.accessioned2026-07-07T11:52:20Z
dc.date.available2026-07-07T11:52:20Z
dc.descriptionThe search for the top squark ($\widetilde{t}_{1}$) within the kinematic reach of Tevatron Run II is of great contemporary interest. Such a $\widetilde{t}_{1}$ can explain the baryon asymmetry of the universe provided $120 ~GeV/c^{2} \leq m_{\widetilde{t}_{1}} \leq m_t$. Moreover if $Δm \equiv m_{\widetilde{t}_{1}}$ - $m_{\widetildeχ_1^0}$ is small, where $\widetildeχ_1^0$ is the LSP, the dark matter relic density as obtained from the WMAP data may be explained via $\widetilde{t}_{1}$- LSP coannihilation. In this scenario the decay $\widetilde{t}_{1} \to c \widetildeχ_1^0$ is likely to occur with 100 % branching ratio but for small $Δm$ the conventional di-jet + $\not E_T$ signal becomes unobservable. We propose a new search strategy based on the $2j + \not E_T$ signature accompanied by an isolated cluster of energy which arises from a decaying heavy particle with characteristic decay length. Our preliminary simulations with PYTHIA indicate that for $100 ~GeV/c^{2} \le m_{\widetilde{t}_{1}} \le 130 ~GeV/c^{2}$ this signal may be observable while somewhat lager $m_{\widetilde{t}_{1}}$ may still provide hints of new physics.
dc.description14 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0807.0994
dc.identifierhttp://arxiv.org/abs/0807.0994
dc.identifierPhys.Lett.B669:311-316,2008
dc.identifierdoi:10.1016/j.physletb.2008.10.015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204198
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSearch for Top Squarks at Tevatron Inspired by Dark Matter and Electroweak Baryogenesis
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