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Context: It is not known how many globular clusters may have been leftundetected towards the Galactic bulge. Aims: One of the aims of the VISTAVariables in the Via Lactea (VVV) Survey is to accurately measure the physicalparameters of the known globular clusters in the inner regions of the Milky Wayand to search for new ones, hidden in regions of large extinction. Methods:Deep near infrared images give deep JHKs-band photometry of a regionsurrounding the known globular cluster UKS 1 and reveal a new low-mass globularcluster candidate that we name VVV CL001. Results: We use the horizontal branchred clump in order to measure E(B-V)~2.2 mag, $(m-M)_0$=16.01 mag, and D=15.9kpc for the globular cluster UKS 1. Based on the near-infrared colour magnitudediagrams, we also measure that VVV CL001 has E(B-V)~2.0, and that it is atleast as metal-poor as UKS 1, however, its distance remains uncertain.Conclusions: Our finding confirms the previous projection that the centralregion of the Milky Way harbors more globular clusters. VVV CL001 and UKS 1 aregood candidates for a physical cluster binary, but follow-up observations areneeded to decide if they are located at the same distance and have similarradial velocities.

Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge