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The XXL survey is the largest survey carried out by XMM-Newton. Covering anarea of 50deg$^2$, the survey contains $\sim450$ galaxy clusters out to aredshift $\sim$2 and to an X-ray flux limit of$\sim5\times10^{-15}erg\,s^{-1}cm^{-2}$. This paper is part of the firstrelease of XXL results focussed on the bright cluster sample. We investigatethe scaling relation between weak-lensing mass and X-ray temperature for thebrightest clusters in XXL. The scaling relation is used to estimate the mass ofall 100 clusters in XXL-100-GC. Based on a subsample of 38 objects that liewithin the intersection of the northern XXL field and the publicly availableCFHTLenS catalog, we derive the $M_{WL}$ of each system with carefulconsiderations of the systematics. The clusters lie at $0.1<z<0.6$ and span arange of $ T\simeq1-5keV$. We combine our sample with 58 clusters from theliterature, increasing the range out to 10keV. To date, this is the largestsample of clusters with $M_{WL}$ measurements that has been used to study themass-temperature relation. The fit ($M\propto T^b$) to the XXL clusters returnsa slope $b=1.78^{+0.37}_{-0.32}$ and intrinsic scatter $\sigma_{\lnM|T}\simeq0.53$; the scatter is dominated by disturbed clusters. The fit to thecombined sample of 96 clusters is in tension with self-similarity,$b=1.67\pm0.12$ and $\sigma_{\ln M|T}\simeq0.41$. Overall our resultsdemonstrate the feasibility of ground-based weak-lensing scaling relationstudies down to cool systems of $\sim1keV$ temperature and highlight that thecurrent data and samples are a limit to our statistical precision. As such weare unable to determine whether the validity of hydrostatic equilibrium is afunction of halo mass. An enlarged sample of cool systems, deeper weak-lensingdata, and robust modelling of the selection function will help to explore theseissues further.

The XXL Survey IV. Mass-temperature relation of the bright cluster sample