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Molecular line surveys are among the main tools to probe the structure andphysical conditions in protoplanetary disks (PPDs), the birthplace of planets.The large radial and vertical temperature as well as density gradients in thesePPDs lead to a complex chemical composition, making chemistry an important stepto understand the variety of planetary systems. We aimed to study the chemicalcontent of the protoplanetary disk surrounding GG Tau A, a well-known triple TTauri system. We used NOEMA with the new correlator PolyFix to observerotational lines at 2.6 to 4 mm from a few dozen molecules. We analysed thedata with a radiative transfer code to derive molecular densities and theabundance relative to $^{13}$CO, which we compare to those of the TMC1 cloudand LkCa15 disk. We report the first detection of CCS in PPDs. We alsomarginally detect OCS and find 16 other molecules in the GG Tauri outer disk.Ten of them had been found previously, while seven others ($^{13}$CN,N$_2$H$^+$, HNC, DNC, HC$_3$N, CCS, and C$^{34}$S) are new detections in thisdisk. The analysis confirms that sulphur chemistry is not yet properlyunderstood. The D/H ratio, derived from DCO$^{+}$/HCO$^{+}$, DCN/HCN, andDNC/HNC ratios, points towards a low temperature chemistry. The detection ofthe rare species CCS confirms that GG Tau is a good laboratory to study theprotoplanetary disk chemistry, thanks to its large disk size and mass.

An unbiased NOEMA 2.6 to 4 mm survey of the GG Tau ring: First detection of CCS in a protoplanetary disk