Abstract
Recently the CERN ALICE experiment, in its dedicated cosmic ray run, observed muon bundles of very high multiplicities, thereby confirming similar findings from the LEP era at CERN (in the CosmoLEP project). Significant evidence for anisotropy of arrival directions of the observed high multiplicity muonic bundles is found. Estimated directionality suggests their possible extragalactic provenance. We argue that muonic bundles of highest multiplicity are produced by strangelets, hypothetical stable lumps of strange quark matter infiltrating our Universe.
Highlights
This talk is based on [1], where the relevant details can be found
In this respect the recent measurement performed by the ALICE experiment at CERN LHC in its dedicated cosmic ray run [4, 5] is of great importance
We propose to return to our old idea that muon bundles of extremely high multiplicities could be produced by strangelets, hypothetical stable lumps of strange quark matter (SQM) infiltrating our Universe [6]
Summary
Cosmic ray physics is our unique source of information on events in the energy range which will never be accessible in Earth-bound experiments [2, 3] This is why one of the most important aspects of their investigation is the understanding of the primary cosmic ray (CR) flux and its composition. Similar events have already been studied in the previous LEP experiments at CERN (in the so called CosmoLEP program) such as ALEPH, DELPHI and L3 In this talk we shall concentrate mainly on the first, high multiplicity events. We propose to return to our old idea that muon bundles of extremely high multiplicities could be produced by strangelets, hypothetical stable lumps of strange quark matter (SQM) infiltrating our Universe [6]. Strangelets with such masses, much larger than the masses of ordinary nuclei, could produce extremely large groups of muons in collisions with the atmosphere
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