Leptoquark models and the energy spectrum of cosmic rays

Details Leptoquark models and the energy spectrum of cosmic rays Leptoquark models and the energy spectrum of cosmic rays

2011-01-20

arxiv.org/abs/1101.4010v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures

Scientific paper

The IceCube Neutrino Observatory has recently placed a new limit on the extremely-high energy (EHE) neutrino flux lower than the Greisen--Zatsepin--Kuzmin (GZK) cosmogenic neutrino intensities expected in the case of proton-dominated primary composition. This result favors the mixed chemical composition models and excludes scenarios with strongly interacting neutrinos proposed so far. Nevertheless we argue that it is possible to construct such models consistently with the IceCube data if to extend the standard model Lagrangian by adding a leptoquark term. It is notable that the resulting Lagrangian couples leptons (not only neutrinos!) to gluons through leptoquark excitations in the subrocess $lg\rightarrow lq{\bar q}$ so that leptons of relevant energies in the Earth as well as in Extensive Air Showers will behave as hadrons. The latter may lead, for example, to misinterpretations in identifying the chemical composition of EHE cosmic rays. The EHE primaries will seem heavier due to production of secondary strongly interacting leptons in agreement with the recent observations. We argue that our model naturally predicts many exotic fenomena such as the second knee, centauros, excess of high energy muons ($\geq$10 TeV), existence of TeV photons, alignment, penetrating cascades. We also argue that a clear manifestation of physics beyond the standard model has been observed by the IceCube Neutrino Observatory.

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