Abstract
We investigate a beyond standard model (SM) portal scenario for dark matter (DM) particle with leptoquark being the mediator field. Leptoquark, a colored particle having both baryon and lepton number, allows the DM to interact with the SM fields via renormalizable interaction. By focusing on a vector leptoquark portal with Majorana fermion DM candidate, we find the only unknown coupling in the model is sensitive to all three main features of a DM model namely, relic density, direct detection as well as indirect detection, while being consistent with collider data. We explore the parameter space of the portal with minimum of its field content and find that AMS-02 data for antiproton flux imposes stringent bound till date and excludes the DM mass up to 400,GeV. The LUX 2016 data for DM-neutron scattering cross section allows the region compatible with relic density, however the future sensitivity of LUX-ZEPLIN experiment can probe the model up to its perturbative limit.
Highlights
The cosmological evidences of missing mass hypothesized as dark matter (DM) support its gravitational interaction
We investigate a beyond standard model (SM) portal scenario for dark matter (DM) particle with leptoquark being the mediator field
By focusing on a vector leptoquark portal with Majorana fermion DM candidate, we find the only unknown coupling in the model is sensitive to all three main features of a DM model namely, relic density, direct detection as well as indirect detection, while being consistent with collider data
Summary
The cosmological evidences of missing mass hypothesized as dark matter (DM) support its gravitational interaction. In several extensions of the SM, which treat the leptons and quarks in the same basis, like SU (5) [5], SU (4)C × SU (2)L × SU (2)R [6], or S O(10) [7,8] and theories with composite model [9] and technicolor model [10] can contain such particles Leptoquarks carry both baryon and lepton numbers simultaneously. This scenario has greater chances to be probed in direct as well as indirect detection experiment due to the larger cross section. As the leptoquark under discussion is a vector particle, it should be gauged under some symmetry group in the UV complete model. 2, we discuss the possible leptoquark portals which can arise from the minimal field content of the SM and focus on an explicit vector leptoquark portal model.
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