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  • Letter
  • Open Access

Mono-X signal and two component dark matter: New distinction criteria

Subhaditya Bhattacharya1,*, Purusottam Ghosh2,†, Jayita Lahiri3,‡, and Biswarup Mukhopadhyaya4,§

  • 1Department of Physics, Indian Institute of Technology Guwahati, Assam-781039, India
  • 2School Of Physical Sciences, Indian Association for the Cultivation of Science, 2A and 2B, Raja S.C. Mullick Road, Kolkata 700032, India
  • 3II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
  • 4Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur—741246, India

  • *subhab@iitg.ac.in
  • †spspg2655@iacs.res.in
  • ‡jayita.lahiri@desy.de
  • §biswarup@iiserkol.ac.in
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Phys. Rev. D 108, L111703 – Published 14 December, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L111703

Abstract

The identification and isolation of two weakly interacting massive particles (WIMP) dark matter (DM) components at colliders is of wide interest on the one hand but extremely challenging on the other, especially when the dominant signal of both DM components is of the mono-X type (X=γ, Z, H). After emphasizing that an e+e− collider is more suitable for this goal, we first identify the theoretical principles that govern the occurrence of two peaks in missing energy (E) distribution, in a double-DM scenario. We then identify a variable that rather spectacularly elicits the double-peaking behavior, namely, the plot of bin-wise statistical significance (S/B) against E. Using Gaussian fits of the histograms, we apply a set of criteria developed by us, to illustrate the above points numerically for suitable benchmarks.

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Phys. Rev. D 108, L111703– Published 14 December, 2023
  • Received 1 February 2023
  • Accepted 17 November 2023
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