PT Journal
AU Dai, LR
   Oset, E
TI Helicity amplitudes in B -> D*(nu)over-barl decay
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2018
BP 951 - 11pp
VL 78
IS 11
DI 10.1140/epjc/s10052-018-6438-0
LA English
AB We use a recent formalism of the weak hadronic reactions that maps the transition matrix elements at the quark level into hadronic matrix elements, evaluated with an elaborate angular momentum algebra that allows finally to write the weak matrix elements in terms of easy analytical formulas. In particular they appear explicitly for the different spin third components of the vector mesons involved. We extend the formalism to a general case, with the operator parameter, which suggest to use this magnitude to test different models beyond the standard model. We show that our formalism implies the heavy quark limit and compare our results with calculations that include higher order corrections in heavy quark effective theory. We find very similar results for both approaches in normalized distributions, which are practically identical at the end point of M-inv((nu l)) = m(B) – m(D)*
ER