On the extraction of $B_s \to D^{(*)}_s$ form factors from ${ N_f}=2$ lattice QCD - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

On the extraction of $B_s \to D^{(*)}_s$ form factors from ${ N_f}=2$ lattice QCD

Résumé

We report on a two-flavour lattice QCD study of the $B_s \to D_s$ and $B_s \to D^*_s$ transitions parameterized, in the heavy quark limit, by the form factors ${\cal G}$, and $h_{A_1}$, $h_{A_2}$ and $h_{A_3}$, respectively. In the search for New Physics through tests of lepton flavour universality, $B_s$ decay channels are complementary to the $B$ decays widely studied at $B$ factories and LHCb, while on the theory side they can be better controlled than the $B_c$ and $\Lambda_b$ decays. The purpose of this exploratory two-flavour study is, in preparation for future analyses of lattice QCD simulations with ${N_f>2}$ and physical quark-masses, to gain experience on a suitable method for a lattice extraction of form factors associated with $b \to c$ currents that may yield tighter control over systematic effects like contamination from excited states and cut-off effects. We obtain the zero-recoil values ${\cal G}^{B_s \to D_s}(1)=1.03(14)$ and $h^{B_s \to D^*_s}(1)=0.85(16)$.

Dates et versions

hal-03621380 , version 1 (03-11-2021)
hal-03621380 , version 2 (28-03-2022)

Identifiants

Citer

Benoît Blossier, Pierre-Henri Cahue, Jochen Heitger, Simone La Cesa, Jan Neuendorf, et al.. On the extraction of $B_s \to D^{(*)}_s$ form factors from ${ N_f}=2$ lattice QCD. 2021. ⟨hal-03621380v1⟩
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