%0 Journal Article
%T Helicity amplitudes in the (B)over-bar -> D*(nu)over-bar(tau)tau decay with V-A breaking in the quark sector
%A Dai, L. R.
%A Oset, E.
%J European Physical Journal A
%D 2020
%V 56
%N 5
%I Springer
%@ 1434-6001
%G English
%F Dai+Oset2020
%O WOS:000536090300001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4410), last updated on Thu, 18 Jun 2020 11:02:12 +0000
%X In view of the recent measurement of the F-D*(L) magnitude in the (B) over bar -> D*(nu) over bar (tau)tau reaction we evaluate this magnitude within the standard model and for a family of models with the gamma(mu) – alpha gamma(mu)gamma(5) current structure for the quarks for different values of a. At the same time we evaluate also the transverse contributions, M = -1, M = +1, and find that the difference between the M = -1 and M = +1 contributions is far more sensitive to changes in a than the longitudinal component. These findings should be looked as an incentive to measure the transverse helicities which are bound to be a far more sensitive magnitude to possible new physics than F-D*(L).
%R 10.1140/epja/s10050-020-00160-6
%U https://arxiv.org/abs/1908.08967
%U https://doi.org/10.1140/epja/s10050-020-00160-6
%P 154-8pp