%0 Journal Article
%T 'Bs --> Ds l nu' near zero recoil in and beyond the Standard Model
%A Mariam Atoui
%A Damir Becirevic
%A Vincent Morenas
%A Francesco Sanfilippo
%J Physics
%D 2013
%I arXiv
%R 10.1140/epjc/s10052-014-2861-z
%X We compute the normalization of the form factor entering the Bs --> Ds l nu decay amplitude by using numerical simulations of QCD on the lattice. From our study with Nf=2 dynamical light quarks, and by employing the maximally twisted Wilson quark action, we obtain in the continuum limit G(1) = 1.052(46). We also compute the scalar and tensor form factors in the region near zero recoil and find f0(t0)/f+(t0)=0.77(2), fT(t0,mb)/f+(t0)=1.08(7), for t0=11.5 GeV^2. These latter results are useful for searching the effects of physics beyond the Standard Model in Bs --> Ds l nu decays. Our results for the similar form factors relevant to the non-strange case indicate that the method employed here can be used to achieve the precision determination of the B --> D l nu decay amplitude as well.
%U http://arxiv.org/abs/1310.5238v3