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To unravel the star formation process, we present a multi-scale andmulti-wavelength study of the filamentary infrared dark cloud (IRDC)G333.73+0.37, which hosts previously known two HII regions located at itscenter. Each HII region is associated with a mid-infrared source, and isexcited by a massive OB star. Two filamentary structures and a hub-filamentsystem (HFS) associated with one HII region are investigated in absorptionusing the Spitzer 8.0 $\mu$m image. The $^{13}$CO(J = 2-1) and C$^{18}$O(J =2-1) line data reveal two velocity components (around $-$35.5 and $-$33.5 kms$^{-1}$) toward the IRDC, favouring the presence of two filamentary clouds atdifferent velocities. Nonthermal (or turbulent) motions are depicted in theIRDC using the C$^{18}$O line data. The spatial distribution of young stellarobjects (YSOs) identified using the VVV near-infrared data traces starformation activities in the IRDC. Low-mass cores are identified toward both theHII regions using the ALMA 1.38 mm continuum map. The VLT/NACO adaptive-opticsL$^{\prime}$-band images show the presence of at least three point-like sourcesand the absence of small-scale features in the inner 4000 AU around YSOs NIR31and MIR 16 located toward the HII regions. The HII regions and groups of YSOare observed toward the central part of the IRDC, where the two filamentaryclouds intersect. A scenario of cloud-cloud collision or converging flows inthe IRDC seems to be applicable, which may explain star formation activitiesincluding HFS and massive stars.

New evidences in IRDC G333.73+0.37: colliding filamentary clouds, hub-filament system, and embedded cores