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Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2014

Bs→Dsℓνℓ near zero recoil in and beyond the Standard Model

Résumé

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.

Dates et versions

hal-00876081 , version 1 (23-10-2013)

Identifiants

Citer

Mariam Atoui, Damir Becirevic, Vincent Morenas, Francesco Sanfilippo. Bs→Dsℓνℓ near zero recoil in and beyond the Standard Model. European Physical Journal C: Particles and Fields, 2014, 74, pp.2861. ⟨10.1140/epjc/s10052-014-2861-z⟩. ⟨hal-00876081⟩
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