---
author:
- 'I. Tereno'
- 'C. Schimd'
- 'J.-P. Uzan'
- 'M. Kilbinger'
- 'F. H. Vincent'
- 'L. Fu'
date: 'Received 3 October 2008 ; accepted 7 February 2009'
title: 'CFHTLS[^1] weak-lensing constraints on the neutrino masses'
---

[Oscillation experiments yield strong evidence that at least some neutrinos are massive. As a hot dark-matter component, massive neutrinos shuld modify the expansion history of the Universe as well as the evolution of cosmological perturbations, in a different way from cold dark matter or dark energy.]{} [We use the latest release of CFHTLS cosmic-shear data to constrain the sum of the masses $\sum m_\nu$ of neutrinos, assuming three degenerate mass states. We also consider a joint analysis including other cosmological observables, notably CMB anisotropies, baryonic acoustic oscillations, and distance modulus from Type Ia supernovae.]{} [Combining CAMB with a lensing code, we compute the aperture mass variance using a suitable recipe to deal with matter perturbations in the non-linear regime. The statistical analysis is performed by sampling an 8-dimensional likelihood on a regular grid as well as using the importance sampling technique.]{} [We obtain the first constraint on neutrino masses based on cosmic-shear data, and combine CFHTLS with WMAP, SDSS, 2dFGRS, 