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We present a near-infrared J and K photometric catalog containing more than73,000 stars in the central region of the giant Globular Cluster omegaCentauri. This is the largest IR data-set ever published for this cluster andhas been used to completely characterize the morphology and the properties ofthe Red Giant Branch (RGB). In particular, we concentrated our attention on (i)the anomalous RGB (RGB-a), recently discovered in this cluster and (ii) the RGBof the dominant metal poor population (RGB-MP) in both the infrared (K,J-K) andoptical-infrared (K,V-K) color magnitude diagrams. The full set ofmorphological parameters and photometric indices has been measured and comparedwith the empirical relations by Ferraro et al. (2000). We find that thedetailed photometric properties of the RGB-a are in full agreement with therecent spectroscopic metallicity estimates, that place it at the metal-richextreme of the stellar population mix in omega Centauri.Comment: 10 pages, 14 figures, submitted to A&

IR photometric properties of Red Giants in ω Cen