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In this paper, we describe the first tests of a dual-readout fibercalorimeter in which silicon photomultipliers are used to sense the(scintillation and Cherenkov) light signals. The main challenge in thisdetector is implementing a design that minimizes the optical crosstalk betweenthe two types of fibers, which are located very close to each other and carrylight signals that differ in intensity by about a factor of 60. Theexperimental data, which were obtained with beams of high-energy electrons andmuons as well as in lab tests, illustrate to what extent this challenge wasmet. The Cherenkov light yield, a limiting factor for the energy resolution ofthis type of calorimeter, was measured to be about twice that of the previouslytested configurations based on photomultiplier tubes. The lateral profiles ofelectromagnetic showers were measured on a scale of millimeters from the showeraxis and significant differences were found between the profiles measured withthe scintillating and the Cherenkov fibers.

Tests of a dual-readout fiber calorimeter with SiPM light sensors