Journal
PHYSICAL REVIEW D
Volume 100, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.115009
Keywords
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Funding
- IBS [IBS-R018-D1]
- National Research Foundation of Korea [NRF-2017R1C1B5075677, NRF-2018R1C1B6006572]
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The phenomenology of the dark sector is complicated if the dark sector is charged under a confined hidden gauge group. In such a kind of model, a dark parton produced at a high-energy collider showers and hadronizes to a cluster of dark mesons. Dark mesons then decay to visible particles and produce a jetlike signal, which is called a dark jet in this work. Collider signal of a dark jet depend on the property of dark mesons. For example, a finite lifetime of a dark meson would provide a displaced vertex or displaced track; thus, one can use these displaced objects to tag a dark jet. However, if the lifetime of a dark meson is collider negligible (too short to manifest a displaced vertex), it would be difficult to distinguish a dark jet from standard model QCD jets. In this work, we propose a new tagging strategy to identify dark jets from QCD backgrounds. This strategy is based on jet-substructure analysis. We study various jet-substructure variables and find out variables with good discrimination ability. Our result shows that by combining multiple jet-substructure variables one could distinguish dark jets from QCD background and thus enhance the sensitivity of the dark sector search at a collider.
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