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Abstract: The 5.4 kton MINOS far detector has been taking charge-separated cosmic raymuon data since the beginning of August, 2003 at a depth of 2070meters-water-equivalent in the Soudan Underground Laboratory, Minnesota, USA.The data with both forward and reversed magnetic field running configurationswere combined to minimize systematic errors in the determination of theunderground muon charge ratio. When averaged, two independent analyses find thecharge ratio underground to be 1.374 +- 0.004 (stat.) +0.012 -0.010(sys.).Using the map of the Soudan rock overburden, the muon momenta as measuredunderground were projected to the corresponding values at the surface in theenergy range 1-7 TeV. Within this range of energies at the surface, the MINOSdata are consistent with the charge ratio being energy independent at the twostandard deviation level. When the MINOS results are compared with measurementsat lower energies, a clear rise in the charge ratio in the energy range 0.3 -1.0 TeV is apparent. A qualitative model shows that the rise is consistent withan increasing contribution of kaon decays to the muon charge ratio.



Autor: MINOS Collaboration

Fuente: https://arxiv.org/







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