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We present the first weak-lensing-based scaling relation between galaxycluster mass, M_wl, and integrated Compton parameter Y_sph. Observations of 18galaxy clusters at z~0.2 were obtained with the Subaru 8.2-m telescope and theSunyaev-Zel'dovich Array. The M_wl-Y_sph scaling relations, measured atDelta=500, 1000, and 2500 rho_c, are consistent in slope and normalization withprevious results derived under the assumption of hydrostatic equilibrium (HSE).We find an intrinsic scatter in M_wl at fixed Y_sph of 20%, larger than bothprevious measurements of M_HSE-Y_sph scatter as well as the scatter in truemass at fixed Y_sph found in simulations. Moreover, the scatter in ourlensing-based scaling relations is morphology dependent, with 30-40% largerM_wl for undisturbed compared to disturbed clusters at the same Y_sph at r_500.Further examination suggests that the segregation may be explained by theinability of our spherical lens models to faithfully describe thethree-dimensional structure of the clusters, in particular, the structure alongthe line-of-sight. We find that the ellipticity of the brightest clustergalaxy, a proxy for halo orientation, correlates well with the offset in massfrom the mean scaling relation, which supports this picture. This providesempirical evidence that line-of-sight projection effects are an importantsystematic uncertainty in lensing-based scaling relations.

LoCuSS: The Sunyaev-Zel'dovich Effect and Weak Lensing Mass Scaling Relation