The shape of the Bs0→Ds∗−μ+νμ differential decay
rate is obtained as a function of the hadron recoil using proton-proton
collision data at a centre-of-mass energy of 13 TeV, corresponding to an
integrated luminosity of 1.7 fb−1 collected by the LHCb detector. The
Bs0→Ds∗−μ+νμ decay is reconstructed through the
decays Ds∗−→Ds−γ and Ds−→K−K+π−. The differential decay rate is fitted with the
Caprini-Lellouch-Neubert (CLN) and Boyd-Grinstein-Lebed (BGL) parametrisations
of the form factors, and the relevant quantities for both are extracted