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We elaborate on the low-energy effective action of $6D,\,{\cal N}=(1,1)$supersymmetric Yang-Mills (SYM) theory in the ${\cal N}=(1,0)$ harmonicsuperspace formulation. The theory is described in terms of analytic ${\calN}=(1,0)$ gauge superfield $V^{++}$ and analytic $\omega$-hypermultiplet, bothin the adjoint representation of gauge group. The effective action is definedin the framework of the background superfield method ensuring the manifestgauge invariance along with manifest ${\cal N}=(1,0)$ supersymmetry. Wecalculate leading contribution to the one-loop effective action using theon-shell background superfields corresponding to the option when gauge group$SU(N)$ is broken to $SU(N-1)\times U(1)\subset SU(N)$. In the bosonic sectorthe effective action involves the structure $\sim \frac{F^4}{X^2}$, where $F^4$is a monomial of the fourth degree in an abelian field strength $F_{MN}$ and$X$ stands for the scalar fields from the $\omega$-hypermultiplet. It ismanifestly demonstrated that the expectation values of the hypermultipletscalar fields play the role of a natural infrared cutoff.

Leading low-energy effective action in $6D$, ${\cal N}=(1,1)$ SYM theory