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Roman Pasechnik

Senior lecturer

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

Author

  • 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/s

  • Department of Astronomy and Theoretical Physics

Publishing year

2016-03-20

Language

English

Publication/Series

International Journal of Modern Physics A

Volume

31

Issue

8

Document type

Journal article

Publisher

World Scientific Publishing

Topic

  • Subatomic Physics

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 0217-751X