Mass reconstruction with $M_2$ under constraint in semi-invisible production at a hadron collider

Understand

The mass-constraining variable $M_2$, a $(1+3)$-dimensional natural successor of extremely popular $M_{T2}$, possesses an array of rich features having the ability to use on-shell mass constraints in semi-invisible production at a hadron collider.

• In this work, we investigate the consequence of applying a heavy resonance mass-shell constraint in the context of a semi-invisible antler decay topology produced at the LHC.
• Our proposed variable, under additional constraint, develops a new kink solution at the true masses.
• This enables one to determine the invisible particle mass simultaneously with the parent particle mass from these events.