6-quark Dark Matter: viable + explains many observations

Abstract

It has recently been proposed that the relatively inert, highly symmetric, neutral flavor singlet scalar hadron made of uuddss quarks may have a mass < 2(m p + m e ). This is consistent with QCD theory, and with existing accelerator and non-accelerator constraints. For mass in the 1.5-1.8 GeV range, the observed DM relic abundance and the observed DM to ordinary matter ratio can emerge naturally. Dark matter freezes out before primordial nucleosynthesis and does not significantly impact primordial abundances, so the conventional argument that DM is non-baryonic does not apply. The interaction cross section between DM and the gas in the Galaxy is such that the dark matter in our local neighborhood is naturally co-rotating with the solar system, to a sufficient degree that DM may not have enough energy to be detected in applicable DM experiments. Interaction with the gas in galactic disks provides the first (non-MONDian) explanation for the striking correlation in the small-scale structure of rotation curves and the inhomogeneous distribution of gas, and also accounts (unlike MOND) for instances of galaxies not exhibiting such correlations. Depending on the cross-section, a DM-baryon interaction can produce a dark matter disk as suggested by recent studies, and has many or all virtues of self-interacting DM (SIDM) for removing inconsistencies of LCDM. Lab experiments to discover this particle are discussed.

Closing the window on ∼GeV Dark Matter with moderate (∼μb) interaction with nucleons

“…In the above discussions, we have only considered the usual DM velocity distribution. However, as discussed in [20], for a large enough cross section, DM interactions with gas in the Galactic disk can in principle significantly alter the local DM velocity distribution, causing the DM to co-rotate with the solar system to some degree. Given that the energy available to deposit in XQC depends quadratically on the velocity, reducing the DM relative velocity distribution reduces the flux of particles capable of producing an energy deposit above threshold.…”

Four-quark exotic mesons

“…It can transform through weak interactions, which means that mean lifetime of H-dibaryon, τ ≈ 10 −10 s , is considerably longer than that of most ordinary hadrons. It is remarkable that the hexaquark uuddss may be considered as a candidate to dark matter provided its mass satisfies some constraints [7][8][9][10].…”

Dark sector searches in non-LHC experiments

“…The completely symmetric six-quark state uuddss could be deeply bound [15,16]. This is an extension of a prediction by Jaffe [17] in 1976, when he predicted the H Dibaryon with a mass of m H ≈ 2150 GeV/c 2 .…”

“…The green band shows the region of the parameter space corresponding to an explanation of the discrepancy between the measured and expected values of the anomalous muon magnetic moment (g − 2) µ [11] in terms of a contribution from the A in the quantum loops [12,13]. The region above the black line is excluded by the agreement of the anomalous magnetic moment of the electron (g − 2) e with its expected value [14,15,16]. conservative scenario, not shown in Fig.…”