K. I. Shibaev

STABLE MATTER OF 4TH GENERATION: HIDDEN IN THE UNIVERSE AND CLOSE TO DETECTION?

Stable neutrino and U quark of 4th generation are excluded neither by experimental data, nor by astrophysical constraints. Moreover, excess of stable

Monochromatic neutrinos from the annihilation of fourth-generation massive stable neutrinos in the sun and in the earth

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Probes for constituents of composite dark matter

quarks in the Universe can lead to an exciting composite nuclear-interacting form of dark matter, which can even dominate in large scale structure formation.Stable neutrino and U quark of 4th generation are excluded neither by experimental data, nor by astrophysical constraints. Moreover, excess of stable

Gravitation and Cosmology 4

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Composite Dark Matter and its Charged Constituents

quarks in the Universe can lead to an exciting composite nuclear-interacting form of dark matter, which can even dominate in large scale structure formation.

Stable quarks of the 4th family

The accumulation of relic fourth-generation heavy neutrinos (of mass 50 GeV) in the Earth and the Sun, which is followed by their annihilation, is considered. The most conservative estimates of the fluxes of monochromatic electron, muon, and tau neutrinos and antineutrinos of energy 50 GeV from the annihilation of heavy neutrinos are 4.1×10−6 cm−2 s−1 from Earth’s core and 1.1×10−7 cm−2 s−1 from Sun’s core, whence it follows that an analysis of data from underground neutrino observatories may furnish additional information about the existence of fourth-generation neutrinos. It is shown that, because of kinetic equilibrium between the arrival of cosmic neutrinos and their annihilation, the existence of new U(1) gauge interaction of fourth-generation neutrinos has virtually no effect on the estimates of the annihilation fluxes of electron, muon, and tau neutrinos.

Monochromatic neutrinos from massive fourth generation neutrino annihilation in the sun and earth

The nonbaryonic dark matter of the Universe can consist of new stable charged particles, bound in heavy “atoms” by the ordinary Coulomb interaction. If stable particles O−− with charge −2 are in excess over their antiparticles (with charge +2) and there are no stable particles with charges +1 and −1, the primordial helium, formed in Big Bang Nucleosynthesis, captures all O−− in neutral “atoms” of O-helium (OHe), playing the role of specific nuclear interacting dark matter. O-helium dark atoms can provide a solution for the puzzles of dark matter searches. A successful development of composite dark matter scenarios appeals to an experimental search for charged constituents of dark atoms. Estimates of production cross section of such particles at LHC are presented, and experimental signatures of new stable quarks are outlined.