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We use a spectroscopic sample of 286 star-forming galaxies (SFGs) at 1<z<3from the GMASS survey to study different star formation rate (SFR) estimators.Infrared (IR) data are used to derive empirical calibrations to correctultraviolet (UV) and [OII]{\lambda}3727 luminosities for dust extinction anddust-corrected estimates of SFR. In the selection procedure we fully exploitthe available spectroscopic information. On the basis of three continuumindices, we are able to identify and exclude from the sample galaxies in whichold stellar populations might bring a non-negligible contribution to IRluminosity (LIR) and continuum reddening. Using Spitzer-MIPS and Herschel-PACSdata we derive LIR for two-thirds of our sample. The LIR/LUV ratio is used as aprobe of effective attenuation (AIRX) to search for correlations with continuumand spectroscopic features. The relation between AIRX and UV continuum slope({\beta}) was tested for our sample and found to be broadly consistent with theliterature results at the same redshift, though with a larger dispersion withrespect to UV-selected samples. We find a correlation between the rest-frameequivalent width (EW) of the [OII]{\lambda}3727 line and {\beta}, which is themain result of this work. We therefore propose the [OII]{\lambda}3727 line EWas a dust attenuation probe and calibrate it through AIRX, though theassumption of a reddening curve is still needed to derive the actualattenuation towards the [OII]{\lambda}3727 line. We tested the issue ofdifferential attenuation towards stellar continuum and nebular emission: ourresults are in line with the traditional prescription of extra attenuationtowards nebular lines. A set of relations is provided that allows the recoveryof the total unattenuated SFR from UV and [OII]{\lambda}3727 luminosities.(Abridged)

The star formation rate cookbook at 1 < z < 3: Extinction-corrected relations for UV & [OII]{\lambda}3727 luminosities