Measurement of the shape of the B0s→D∗−sμ+νμ differential decay rate

Abstract

Abstract

The shape of the

B s 0

→

D s

∗ −

μ +

ν μ

$$ {B}_s^0\to {D}_s^{\ast -}{\mu}^{+}{\nu}_{\mu } $$ differential decay rate is obtained as a function of the hadron recoil parameter 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

→

D s

∗ −

μ +

ν μ

$$ {B}_s^0\to {D}_s^{\ast -}{\mu}^{+}{\nu}_{\mu } $$ decay is reconstructed through the decays

D s

∗ −

→

D s −

γ

$$ {D}_s^{\ast -}\to {D}_s^{-}\gamma $$ and

D s −

→

K −

K +

π −

$$ {D}_s^{-}\to {K}^{-}{K}^{+}{\pi}^{-} $$ . 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.