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We examine the relation between the galaxy cluster mass M andSunyaev-Zeldovich (SZ) effect signal D_A^2 Y for a sample of 19 objects forwhich weak lensing (WL) mass measurements obtained from Subaru Telescope dataare available in the literature. Hydrostatic X-ray masses are derived fromXMM-Newton archive data and the SZ effect signal is measured from Planckall-sky survey data. We find an M_WL-D_A^2 Y relation that is consistent inslope and normalisation with previous determinations using weak lensing masses;however, there is a normalisation offset with respect to previous measuresbased on hydrostatic X-ray mass-proxy relations. We verify that our SZ effectmeasurements are in excellent agreement with previous determinations fromPlanck data. For the present sample, the hydrostatic X-ray masses at R_500 areon average ~ 20 per cent larger than the corresponding weak lensing masses, atodds with expectations. We show that the mass discrepancy is driven by adifference in mass concentration as measured by the two methods, and, for thepresent sample, the mass discrepancy and difference in mass concentration isespecially large for disturbed systems. The mass discrepancy is also linked tothe offset in centres used by the X-ray and weak lensing analyses, which againis most important in disturbed systems. We outline several approaches that areneeded to help achieve convergence in cluster mass measurement with X-ray andweak lensing observations.

Planck intermediate results. III. The relation between galaxy cluster mass and Sunyaev-Zeldovich signal