Bs → K(*) l(υ)over-bar, angular analysis, S-wave contributions and |Vub|

We analyse the (B) over bar (0)(s) --> K(+)l(-)(upsilon) over bar and (B) over bar (0)(s) --> K*(+)(--> K pi)l(-)(upsilon) over bar decays that are valuable for extracting the CKM matrix element |V-ub|. We calculate the differential and integrated partial widths in units of |V-ub|(2) based on various calculations of hadronic form factors and in particular the latest Lattice QCD calculation of the B-s --> K* form factors. For the decay (B) over bar (0)(s) --> K pi l (upsilon) over bar, we formulate the general angular distributions with the inclusion of the various partial-wave K pi contributions. Using the results for the K pi scalar form factor calculated from unitarized chiral perturbation theory, we explore the S-wave effects on angular distribution variables and demonstrate that they may not be negligible, considering the high precision expected in future measurements. We also briefly discuss the impact of the S-wave pi pi contributions in the B- --> pi(+)pi(-)l (upsilon) over bar decay and provide estimates for the mode B- --> K(+)K(-)l (upsilon) over bar . The studies of these channels in future can not only be used to determine |V-ub|, but may also provide valuable information on the K pi and pi pi phase shifts.