TY  - JOUR
AU  - Dai, L. R.
AU  - Oset, E.
PY  - 2020
DA  - 2020//
TI  - Helicity amplitudes in the (B)over-bar -> D*(nu)over-bar(tau)tau decay with V-A breaking in the quark sector
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 154
EP  - 8pp
VL  - 56
IS  - 5
PB  - Springer
AB  - 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).
SN  - 1434-6001
UR  - https://arxiv.org/abs/1908.08967
UR  - https://doi.org/10.1140/epja/s10050-020-00160-6
DO  - 10.1140/epja/s10050-020-00160-6
LA  - English
N1  - WOS:000536090300001
ID  - Dai+Oset2020
ER  -