https://doi.org/10.1140/epjc/s10052-014-2861-z
Regular Article - Theoretical Physics
near zero recoil in and beyond the Standard Model
1
Laboratoire de Physique Corpusculaire, Université Blaise Pascal, CNRS/IN2P3, 63177 , Aubière Cedex, France
2
Laboratoire de Physique Théorique (Bât 210), Université Paris Sud and CNRS, Centre d’Orsay, 91405 , Orsay-Cedex, France
* e-mail: matoui@in2p3.fr
Received:
10
January
2014
Accepted:
12
April
2014
Published online:
8
May
2014
We compute the normalization of the form factor entering the 
decay amplitude by using numerical simulations of QCD on the lattice. From our study with 
dynamical light quarks, and by employing the maximally twisted Wilson quark action, we obtain in the continuum limit 
. We also compute the scalar and tensor form factors in the region near zero recoil and find 
, 
, for 
. The latter results are useful for searching the effects of physics beyond the Standard Model in 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 
decay amplitude as well.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
