Isotriplet technicolor interacting massive particle as dark matter

Abstract

We suggest that a weak isotriplet composite scalar possessing an unbroken U(1) global symmetry naturally arises in technicolor models leading to an interesting type of dark matter candidate: the iTIMP. We propose explicit models of the iTIMP, study earth based constraints and suggest possible collider signals. INTRODUCING THE iTIMPRecent progress in the understanding of the phase diagram of asymptotically free gauge theories [1,2,3,4,5] has led to renewed interest in models of dynamical electroweak symmetry breaking [6]. For a recent review of the latest developments see [7] while an earlier review is [8]. Explicit examples of technicolor models, not in conflict with electroweak precision tests, have been put forward in [1,2,3,9,10]. The simplest incarnations of these models are known as (Ultra) Minimal Walking Technicolor models [1, 2, 3, 10] and indicated in short by MWT and UMT respectively. The principal feature is that the gauge dynamics is such that one achieves (near) conformal dynamics for a small number of flavors and colors. Cold dark matter candidates can be constructed via either the lightest technibaryon, here termed Technicolor Interacting Massive Particles (TIMP)s [10,11,12,13], or new heavy leptons naturally associated to the technicolor theory [14]. The TIMP is naturally of asymmetric dark matter type [11], meaning that its relic density does not have a thermal origin. Within the (U)MWT models such a relic density has been estimated in [10,12] and the results can be used for the dark matter envisioned below. For models addressing explicitly the issues of extended technicolor interactions (ETC) [15], some of which include TIMP type dark matter candidates, see e.g. [16]. These models require information on the phase diagram of chiral gauge theories [7], see also [17].Here we suggest that some of the most phenomenologically interesting candidates are electroweak charged technibaryons. These are identified with the lightest of the weak isotriplet technibaryon states which we term iTIMP. They can be pseudo-Goldstone bosons and thus naturally light with respect to the TeV scale. The presence of generic isospin splitting dramatically reduces the cross section of the iTIMP with ordinary nuclei making them phenomenologically viable cold dark matter candidates.The iTIMP is the neutral isospin zero component of a weak complex triplet with the following electric chargespossessing also an extra U(1) TB technibaryon number. We require that I 3 (T 0 ) = 0 with I 3 the weak isospin operator and assume that T 0 is the lightest state in the triplet due to isospin interactions raising the masses of T ± . This is true for the ordinary pions in QCD, where the mass splittings are of the order of m π ± − m π 0 ∼ 5 MeV. By scaling up this mass splitting to the electroweak scale we estimate: ∆M ≡ M T ± − M T 0 ∼ O(10) GeV. A more precise estimate is [18]:

Composite Goldstone dark matter: experimental predictions from the lattice

“…These would require smaller values of the vector masses which can be obtained, for example, by rendering the theory near conformal by either adding new matter gauged under the composite dynamics and singlet with respect to SM interactions [2,8], and/or changing the matter representation or the composite gauge group [10,61]. Lattice investigations of non-GB composite DM were performed in [26][27][28][29].…”

“…Baryons (which are diquarks in this two-color theory) will couple to local operators of the form which becomes a conserved current in the continuum limit but is not conserved in the lattice theory. In studies of the electroweak form factors, it is advantageous to work directly with the lattice conserved currents, 10) that are easily combined to produce the electromagnetic current,…”

“…with masses ranging from a few GeV to hundreds of GeV if identified with the (pseudo) Goldstone [4]. Several asymmetric DM candidates appeared in the literature [1][2][3][4][5][6][7][8][9][10][11]. An interesting variation on the main composite Higgs theme is the one according to which the composite Higgs is also a (pseudo) Goldstone boson by Kaplan and Georgi [12].…”

Light asymmetric dark matter on the lattice: SU(2) technicolor with two fundamental flavors

“…Asymmetric DM refers to a scenario where the WIMP's antiparticle has been annihilated away, leaving the WIMP itself as the observed DM. Asymmetric DM candidates were put forward in [2] as technibaryons, in [3] as Goldstone bosons, and subsequently in many diverse forms [4][5][6][7][8][9][10]. There is also the possibility of mixed DM [11], i.e.…”

Spontaneous baryogenesis from extremely light asymmetric dark matter

“…On the other hand, asymmetric dark matter models can naturally relate the two quantities by either generating an asymmetry in one sector and then transferring it to the other sector, or by generating both at the same time. Cases in which the asymmetry is transferred via electroweak sphalerons [2][3][4][5][6][7][8][9][10][11] or other baryon number violating interactions [12][13][14][15][16][17][18][19][20][21][22][23][24] have been explored extensively in the literature. These models typically predict Ω DM /Ω B ≈ m DM /m B , once the symmetric component of dark matter is annihilated away.…”