Boosted di-boson from a mixed heavy stop

Abstract

The lighter mass eigenstate (${\tilde{t}}_1$) of the two top squarks, the scalar superpartners of the top quark, is extremely difficult to discover if it is almost degenerate with the lightest neutralino (${\tilde{\chi }}_1^0$), the lightest and stable supersymmetric particle in the R-parity conserving supersymmetry. The current experimental bound on ${\tilde{t}}_1$ mass in this scenario stands only around 200 GeV. For such a light ${\tilde{t}}_1$, the heavier top squark (${\tilde{t}}_2$) can also be around the TeV scale. Moreover, the high value of the higgs ($h$) mass prefers the left and right handed top squarks to be highly mixed allowing the possibility of a considerable branching ratio for ${\tilde{t}}_2\to {\tilde{t}}_{1}h$ and ${\tilde{t}}_2\to {\tilde{t}}_{1}Z$. In this paper, we explore the above possibility together with the pair production of ${\tilde{t}}_2$ ${\tilde{t}}_2^{\ast }$ giving rise to the spectacular di-boson + missing transverse energy final state. For an approximately 1 TeV ${\tilde{t}}_2$ and a few hundred GeV ${\tilde{t}}_1$ the final state particles can be moderately boosted which encourages us to propose a novel search strategy employing the jet substructure technique to tag the boosted $h$ and $Z$. The reconstruction of the $h$ and $Z$ momenta also allows us to construct the stransverse mass $M_{T2}$ providing an additional efficient handle to fight the backgrounds. We show that a 4--5$\sigma$ signal can be observed at the 14 TeV LHC for $\sim$ 1 TeV ${\tilde{t}}_2$ with 100 fb${}^{-1}$ integrated luminosity.

One reference added. To appear in Physical Review D

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