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Hadron beams are invoked to explain the peculiar properties of a subclass ofBL Lac objects, the so-called extreme BL Lacs (EHBLs). This scenario predicts aquite distinctive feature for the high-energy gamma-ray spectrum of thesesources, namely a hard energy tail extending up to $\sim100$ TeV. It has beenproposed that the detection of this tail can offer an unambiguous way todistinguish between the hadron beam scenario and the standard one, whichinstead assumes gamma-ray emission from the jet strongly depleted at thehighest energies ($E>30$ TeV) because of the interaction with the optical-IRcosmic radiation field. We present dedicated simulations of observationsthrough the presently under construction Cherenkov Telescope Array (CTA) of thevery-high energy spectrum of the prototypical EHBL 1ES 0229+200 assuming thetwo alternative models. We demonstrate that, considering 50 hours ofobservations from the southern site of CTA (the most sensitive at the highestenergies), in the case of the hadron beam model it is possible to detect thesource up to 100 TeV. This, together with the non detection of the source above10 TeV in the standard case, ensures that CTA observations can be effectivelyused to unambiguously confirm or rule out the hadron beam scenario.

Putting the hadron beam scenario for extreme blazars to the test with the Cherenkov Telescope Array