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We present observations and analysis of the starburst, PACS-819, at z=1.45($M_*=10^{10.7}$ M$_{ \odot}$), using high-resolution ($0^{\prime \prime}.1$;0.8 kpc) ALMA and multi-wavelength JWST images from the COSMOS-Web program.Dissimilar to HST/ACS images in the rest-frame UV, the redder NIRCam and MIRIimages reveal a smooth central mass concentration and spiral-like features,atypical for such an intense starburst. Through dynamical modeling of the COJ=5--4 emission with ALMA, PACS-819 is rotation-dominated thus has a disk-likenature. However, kinematic anomalies in CO and asymmetric features in the bluerJWST bands (e.g., F150W) support a more disturbed nature likely due tointeractions. The JWST imaging further enables us to map the distribution ofstellar mass and dust attenuation, thus clarifying the relationships betweendifferent structural components, not discernable in the previous HST images.The CO J = 5 -- 4 and FIR dust continuum emission are co-spatial with aheavily-obscured starbursting core (<1 kpc) which is partially surrounded bymuch less obscured star-forming structures including a prominent arc, possiblya tidally-distorted dwarf galaxy, and a clump, either a sign of an ongoingviolent disk instability or a recently accreted low-mass satellite. Withspatially-resolved maps, we find a high molecular gas fraction in the centralarea reaching $\sim3$ ($M_{\text{gas}}$/$M_*$) and short depletion times($M_{\text{gas}}/SFR\sim$ 120 Myrs) across the entire system. Theseobservations provide insights into the complex nature of starbursts in thedistant universe and underscore the wealth of complementary information fromhigh-resolution observations with both ALMA and JWST.

JWST and ALMA discern the assembly of structural and obscured components in a high-redshift starburst galaxy