# High-resolution tracking in a GEM-Emulsion detector

## TL;DR

This paper presents a novel hybrid GEM-emulsion detector tested with a muon beam at CERN, demonstrating high-resolution tracking capabilities and evaluating the GEM chamber's position resolution under various conditions.

## Contribution

It introduces a new hybrid detector combining GEM and emulsion technologies and assesses its high-resolution tracking performance in a controlled beam test.

## Key findings

- GEM-emulsion hybrid achieves micrometric position resolution.
- Position resolution varies with particle inclination and magnetic field presence.
- First experimental evaluation of GEM chamber performance with emulsion detectors.

## Abstract

SHiP (Search for Hidden Particles) is a beam dump experiment proposed at the CERN SPS aiming at the observation of long lived particles very weakly coupled with ordinary matter mostly produced in the decay of charmed hadrons. The beam dump facility of SHiP is also a copious factory of neutrinos of all three kinds and therefore a dedicated neutrino detector is foreseen in the SHiP apparatus. The neutrino detector exploits the Emulsion Cloud Chamber technique with a modular structure, alternating walls of target units and planes of electronic detectors providing the time stamp to the event. GEM detectors are one of the possible choices for this task. This paper reports the results of the first exposure to a muon beam at CERN of a new hybrid chamber, obtained by coupling a GEM chamber and an emulsion detector. Thanks to the micrometric accuracy of the emulsion detector, the position resolution of the GEM chamber as a function of the particle inclination was evaluated in two configurations, with and without the magnetic field