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Roman Pasechnik

Senior lecturer

Typical working day..

Composite scalar dark matter from vector-like SU (2) confinement


  • Roman Pasechnik
  • Vitaly Beylin
  • Vladimir Kuksa
  • Grigory Vereshkov

Summary, in English

A toy-model with SU(2)TC dynamics confined at high scales ΛTC > 100GeV enables to construct Dirac UV completion from the original chiral multiplets predicting a vector-like nature of their weak interactions consistent with electroweak precision tests. In this work, we investigate a potential of the lightest scalar baryon-like (T-baryon) state B0 = UD with mass mB ≥ 1TeV predicted by the simplest two-flavor vector-like confinement model as a dark matter (DM) candidate. We show that two different scenarios with the T-baryon relic abundance formation before and after the electroweak (EW) phase transition epoch lead to symmetric (or mixed) and asymmetric DM, respectively. Such a DM candidate evades existing direct DM detection constraints since its vector coupling to Z boson absents at tree level, while one-loop gauge boson mediated contribution is shown to be vanishingly small close to the threshold. The dominating spin-independent (SI) T-baryon-nucleon scattering goes via tree-level Higgs boson exchange in the t-channel. The corresponding bound on the effective T-baryon-Higgs coupling has been extracted from the recent LUX data and turns out to be consistent with naive expectations from the light technipion case mπTC. The latter provides the most stringent phenomenological constraint on strongly-coupled SU(2)TC dynamics so far. Future prospects for direct and indirect scalar T-baryon DM searches in astrophysics as well as in collider measurements have been discussed.


  • Department of Astronomy and Theoretical Physics - Undergoing reorganization

Publishing year





International Journal of Modern Physics A





Document type

Journal article


World Scientific Publishing


  • Subatomic Physics


  • dark matter annihilation
  • Dark matter candidates
  • dark matter direct detection
  • low-energy effective field theories
  • technibaryon
  • technicolor




  • ISSN: 0217-751X