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We investigate the nature and the physical properties of z, Y and J-dropoutgalaxies selected behind the lensing cluster A2667. This field is part of ourproject aimed at identifying z~7-10 candidates accessible to spectroscopicstudies, based on deep photometry with ESO/VLT HAWK-I and FORS2 (zYJH andKs-band images, AB(3 sigma)~26-27) on a sample of lensing clusters extractedfrom our multi-wavelength combined surveys with SPITZER, HST, and Herschel. Inthis paper we focus on the complete Y and J-dropout sample, as well as thebright z-dropouts fulfilling the selection criteria by Capak et al. (2011). 10candidates are selected within the common field of ~33 arcmin2 (effective areaonce corrected for contamination and lensing dilution). All of them aredetected in H and Ks bands in addition to J and/or IRAC 3.6/4.5, withH(AB)~23.4 to 25.2, and have modest magnification factors. Although best-fitphotometric redshifts place all these candidates at high-z, the contaminationby low-z interlopers is estimated at 50-75% level based on previous studies,and the comparison with the blank-field WIRCAM Ultra-Deep Survey (WUDS). Thesame result is obtained when photometric redshifts include a luminosity prior,allowing us to remove half of the original sample as likely z~1.7-3 interloperswith young stellar pulations and strong extinction. Two additional sourcesamong the remaining sample could be identified at low-z based on a detection at24 microns and on the HST z_850 band. These low-z interlopers are not welldescribed by current templates given the large break, and cannot be easilyidentified based solely on optical and near-IR photometry. Given the estimateddust extinction and high SFRs, some of them could be also detected in the IR orsub-mm bands. After correction for likely contaminants, the observed counts atz>7.5 seem to be in agreement with an evolving LF. (abridged)

Optical dropout galaxies lensed by the cluster A2667