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The acceleration of particles up to GeV or higher energies in microquasarshas been the subject of considerable theoretical and observational efforts inthe past few years. Sco X-1 is a microquasar from which evidence of highlyenergetic particles in the jet has been found when it is in the so-calledHorizontal Branch (HB), a state when the radio and hard X-ray fluxes are higherand a powerful relativistic jet is present. Here we present the first very highenergy gamma-ray observations of Sco X-1 obtained with the MAGIC telescopes. Ananalysis of the whole dataset does not yield a significant signal, with 95% CLflux upper limits above 300 GeV at the level of 2.4x10^{-12} ph/cm^2/s.Simultaneous RXTE observations were conducted to search for TeV emission duringparticular X-ray states of the source. A selection of the gamma-ray dataobtained during the HB based on the X-ray colors did not yield a signal either,with an upper limit of 3.4x10^{-12} ph/cm^2/s. These upper limits place aconstraint on the maximum TeV luminosity to non-thermal X-ray luminosity ofL_{VHE}/L_{ntX}<0.02, that can be related to a maximum TeV luminosity to jetpower ratio of L_{VHE}/L_{j}<10^{-3}. Our upper limits indicate that theunderlying high-energy emission physics in Sco X-1 must be inherently differentfrom that of the hitherto detected gamma-ray binaries.

A search for Very High Energy gamma-ray emission from Scorpius X-1 with the MAGIC telescopes