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# Distinguishing two dark matter component particles at $$e^+e^-$$ colliders

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### Abstract

In this work we demonstrate that a distorted double hump like missing energy ($$\slashed{E}$$) or missing transverse momentum ($$\slashed{E}_T$$) or missing mass ($$\slashed{M}$$) distribution at $$e^+e^-$$ colliders may hint towards the presence of multipartite dark sector. We illustrate the phenomena using a two component dark matter (DM) model involving an inert scalar doublet stabilised under a $$\mathcal{Z}_2$$ symmetry providing a scalar DM, one vector like fermion doublet and a right handed fermion singlet both stabilised under a different $$\mathcal{Z}^{'}_2$$ providing a fermion DM. We indicate the region of parameter space where the production of the heavy charged particles and their subsequent decay to DM yield double peak behaviour in $$\slashed{E}$$ spectrum after satisfying DM constraints. Importantly, we illustrate why and how $$\slashed{E}$$ serves as a better variable than $$\slashed{E}_T$$ in distinguishing two component DM frameworks and therefore how International Linear Collider (ILC) does better than the ongoing Large Hadron Collider (LHC). We also chalk out a set of criteria to identify and segregate the second peak in $$\slashed{E}$$ spectrum, after a careful analysis of the corresponding Standard Model (SM) background contribution, which plays a crucial role.

### Author and article information

###### Journal
24 February 2022
###### Article
2202.12097
377b139a-c4ea-4151-a945-24e633da8430

http://creativecommons.org/publicdomain/zero/1.0/