Measurement of the shape of the $B_s^0\to D_s^{\ast -}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ differential decay rate

Abstract

The shape of the $B_s^0\to D_s^{\ast -}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ 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 $B_s^0\to D_s^{\ast -}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ decay is reconstructed through the decays $D_s^{\ast -}\to D_s^{-}{\hat{I}}^3$ and $D_s^{-}\to K^{-}{K}^{+}\ddot{I}{€}^{-}$. 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.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-046.html (LHCb public pages)