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In this paper we discuss the Standard Model and new physics sensitivity ofthe $\Lambda_b\to\Lambda^\ast(1520)(\to N\!\bar{K})\ell^+\ell^-$ decay atlow-recoil, where $\ell^\pm$ are massive leptons and $N\!\bar{K}=\{pK^-,n\bar{K}^0 \}$. We provide a full angular distribution with a set of operatorsthat includes the Standard Model operators and their chirality flippedcounterparts, and new scalar and pseudo-scalar operators. The resulting angulardistribution allows us to construct observables that we study in the StandardModel and in model-independent new physics scenarios. To reduce the hadroniceffects emanating from the $\Lambda_b\to\Lambda^\ast(1520)$ transition formfactors, we exploit the Heavy Quark Effective theory framework valid at low$\Lambda^\ast(1520)$ recoil, \emph{i.e.,} large dilepton invariant mass squared$q^2\sim \mathcal{O}(m_b^2)$. Working to the leading order in $1/m_b$ andincluding $\mathcal{O}(\alpha_s)$ corrections, we compute the `improvedIsgur-Wise relations' between the form factors. The relations correlate theform factors and thereby allow the description of this decay at the low-recoilregion with a smaller number of independent form factors.

The $\Lambda_b\to\Lambda^\ast(1520)(\to N\!\bar{K})\ell^+\ell^-$ decay at low-recoil in HQET