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

Pasechnik, Roman LU ; Beylin, Vitaly ; Kuksa, Vladimir and Vereshkov, Grigory (2016) In International Journal of Modern Physics A 31(8).
Abstract

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... (More)

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 mπ <ΛTC. 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.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dark matter annihilation, Dark matter candidates, dark matter direct detection, low-energy effective field theories, technibaryon, technicolor
in
International Journal of Modern Physics A
volume
31
issue
8
article number
1650036
publisher
World Scientific Publishing
external identifiers
  • wos:000372781100009
  • scopus:84961163192
ISSN
0217-751X
DOI
10.1142/S0217751X16500366
language
English
LU publication?
yes
id
d094324d-d55d-4bdb-aaf4-42dfdd3bc1da
date added to LUP
2016-08-18 19:49:43
date last changed
2025-01-12 09:59:02
@article{d094324d-d55d-4bdb-aaf4-42dfdd3bc1da,
  abstract     = {{<p>A toy-model with SU(2)<sub>TC</sub> dynamics confined at high scales ΛTC &gt; 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 B<sup>0</sup> = UD with mass m<sub>B</sub> ≥ 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 m<sub>π</sub> &lt;Λ<sub>TC</sub>. The latter provides the most stringent phenomenological constraint on strongly-coupled SU(2)<sub>TC</sub> 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.</p>}},
  author       = {{Pasechnik, Roman and Beylin, Vitaly and Kuksa, Vladimir and Vereshkov, Grigory}},
  issn         = {{0217-751X}},
  keywords     = {{dark matter annihilation; Dark matter candidates; dark matter direct detection; low-energy effective field theories; technibaryon; technicolor}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{8}},
  publisher    = {{World Scientific Publishing}},
  series       = {{International Journal of Modern Physics A}},
  title        = {{Composite scalar dark matter from vector-like SU (2) confinement}},
  url          = {{http://dx.doi.org/10.1142/S0217751X16500366}},
  doi          = {{10.1142/S0217751X16500366}},
  volume       = {{31}},
  year         = {{2016}},
}