Decay modes and coupling constants for D*_s1 (2700) and D_sJ (2860)

Many experiments like LHCb, D0, KEK, SLAC etc have been working to find the states fitting the spectroscopy of heavy-light mesons. Recently LHCb has discovered many new non-strange states like D*_J (2650), D*_J (2760), D*_J (2580), D*_J (2740), D*_J (3000)^o, D*_J (3000)⁺. Strange charm states like D_SJ (2860), discovered by BABAR collaboration, D_SJ (2710) discovered by Belle and BABAR collaboration, D_SJ (3040) by BABAR collaboration have been also added to the list. Theoretically these states are being studied by various models like heavy quark effective theory (HQET), QCD sum rules, ³P₀ model, QCD lattice. By these theories D_s (2710) has been assigned the spin-parity state as n=2 J^P =1^- and D_s (2860) as mixture of n=1 J^P =3^- and n=3 J^P =1^- states. This assignment is done by studying their properties like decay channels, coupling constants, masses etc. Decays can be strong, Radiative, semileptonic. In this paper we will be studying the two body strong decays of strange charm states D_s (2700), D(286 0) using the HQET and then assign the values of the coupling constants