Lower bound on the radius of analyticity of solution for fifth order KdV–BBM equation

We show that the uniform radius of spatial analyticity $$\sigma (t)$$ solution at time t for fifth order KdV–BBM equation cannot decay faster than 1/t large $$t>0$$ , given initial data is analytic with fixed _0$$ . This significantly improves a recent result by Carvajal and Panthee (On model, 2020. arXiv:2009.09328 ) where they established an exponential t.