Abstract
A feasibility study is presented for the search of the lightest bottom squark (sbottom) in a compressed scenario, where its mass difference from the lightest neutralino is 5 GeV. Two separate studies are performed: $(1)$ final state containing two VBF-like tagging jets, missing transverse energy, and zero or one $b$-tagged jet; and $(2)$ final state consisting of initial state radiation (ISR) jet, missing transverse energy, and at least one $b$-tagged jet. An analysis of the shape of the missing transverse energy distribution for signal and background is performed in each case, leading to significant improvement over a cut and count analysis, especially after incorporating the consideration of systematics and pileup. The shape analysis in the VBF-like tagging jet study leads to a $3\sigma$ exclusion potential of sbottoms with mass up to $530 \, (462)$ GeV for an integrated luminosity of $300$ fb$^{-1}$ at 14 TeV, with $5\%$ systematics and PU $= 0 \, (50)$.
Highlights
We find that the shape analysis, compared to a simple cut and count analysis, yields a significant improvement of the compressed sbottom mass reach after incorporating the effects of systematic uncertainty and pileup
We explored the sensitivity with two vector boson fusion (VBF)-like tagged jets and large missing transverse energy in the final state
It is clear that the performance is dominated by the zero b-tagged jet channel, due to the small mass difference of 5 GeV between the sbottom and χ01
Summary
The shape analysis in the VBF-like tagged jet study leads to a 3σ exclusion potential of sbottoms with mass up to 530 (462) GeV for an integrated luminosity of 300 fb−1 at 14 TeV, with 5% systematic uncertainty and PU = 0 (50). Weak-scale supersymmetry addresses the hierarchy problem, gives gauge coupling unification, and (in R-parity conserving models) provides a robust dark matter (DM) candidate, the lightest neutralino (χ01). As such, it is one of the most widely studied frameworks for physics beyond the Standard Model (SM). For comparable squark (q) and gluino (g) masses, the collider data exclude these particles up to approximately 1.5 TeV at 95% C.L. with 20 fb−1 of integrated luminosity [1,2,3,4,5]
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