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In this paper, we compare the branching ratio and rate difference of electronchannel to muon channel of $B \rar K_0^\ast (1430) \ell^+ \ell^-$ and $B \rarK^\ast \ell^+ \ell^-$decays, where $K_0^\ast (1430)$ is the p--wave scalarmeson, in the supersymmetric models. MSSM with $R$ parity is considered sinceconsiderable deviation from the standard model predictions can be obtained in$B\rightarrow X_s \ell^-\ell^+$. Taking $C_{Q1}$ and $C_{Q2}$ about one whichis consistent with the $B\to K^\ast\mu^+\mu^-$ rate at low dileptonic invariantmass region($1\leq q^2\leq 6$GeV$^2$). It is found that, firstly, the $B \rarK_0^\ast (1430) \ell^+ \ell^-$ $(\ell = \mu,\, \tau)$ decay is measurable atLHC, secondly, in comparison with $B \rar K^\ast \ell^+ \ell^-$ decay a greaterdeviation in the $B \rar K_0^\ast (1430) \ell^+ \ell^-$ decay can be seen.Measurement of these observables for the semileptonic rare $B \rar K_0^\ast(1430) \ell^+ \ell^-$, in particular, at low $q^2$ region can give valuableinformation about the nature of interactions within Standard Model or beyond.

A comparative study on $B \rar K^\ast \ell^+ \ell^-$ and $B \rar K_0^\ast (1430) \ell^+ \ell^-$ decays in the Supersymmetric Models