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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 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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
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
publisher
World Scientific
external identifiers
  • 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
2016-09-12 14:35:10
@misc{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},
  keyword      = {dark matter annihilation,Dark matter candidates,dark matter direct detection,low-energy effective field theories,technibaryon,technicolor},
  language     = {eng},
  month        = {03},
  number       = {8},
  publisher    = {ARRAY(0xb65ad60)},
  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},
  volume       = {31},
  year         = {2016},
}