Missing particle associated with two bottom quarks at the LHC: Mono-$b$ versus 2$b$ with razor variables

TL;DR

This paper compares mono-$b$+MET and 2$b$+MET signatures at the LHC for detecting missing particles from an extended Higgs sector, finding 2$b$ with razor variables is more effective than previously thought.

Contribution

It demonstrates that 2$b$+MET with razor analysis is as important as mono-$b$+MET for detecting dark sector particles at the LHC, especially for low mediator masses.

Findings

2$b$+MET with razor analysis is highly sensitive for low mediator masses.

2$b$ signature can outperform mono-$b$ in certain mass regions.

Razor variables enhance the detection sensitivity for missing particles.

Abstract

The extended Higgs sector, such as by a second Higgs doublet of type-II, provides portals to dark sector which contains missing particles at the LHC, e.g., dark matter (DM) particles. In this paper, working in the simplified model and taking into consideration the wide decay width effect of the mediator, we analyze the characteristic signatures of mono-$b$+MET and 2$b$+MET at the LHC. The latter signature was believed to be ineffective, while we found that, with the aid of razor shape analysis, it should be as important as the mono-$b$ signature. In the region of relatively low mediator mass (below a few hundred GeV), by requiring the signal to background ratio greater than a few percent, the 2$b$-tagged razor analysis has comparable sensitivity to the mono-$b$ search; it is even better for mediator lighter than $\sim 200$ GeV.