Abstract
In this paper we present the most significant testbeam results of a dual-readout fibre calorimeter module equipped with silicon photomultipliers (SiPMs) to sense the scintillation and Cherenkov light signals. The main challenges of this detector are the minimization of the optical crosstalk between the two signals and the potential saturation of the digital SiPM-based readout. Both topics have been investigated with encouraging results. As a by-product of this extremely granular readout, the lateral profile of electromagnetic showers was sampled with an unprecedented precision close to the shower axis and significant differences were observed between the scintillating and Cherenkov signals.
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