PT Journal
AU Pich, A
   Rodriguez-Sanchez, A
TI Updated determination of alpha(s)(m(tau)(2)) from tau decays
SO Modern Physics Letters A
JI Mod. Phys. Lett. A
PY 2016
BP 1630032 - 15pp
VL 31
IS 30
DI 10.1142/S0217732316300329
LA English
DE QCD; strong coupling; tau decays
AB Using the most recent release of the ALEPH tau decay data, we present a very detailed phenomenological update of the alpha(s)(m(tau)(2)) determination. We have exploited the sensitivity to the strong coupling in many different ways, exploring several complementary methodologies. All determinations turn out to be in excellent agreement, allowing us to extract a very reliable value of the strong coupling. We find alpha((nf =3))(s)(m(tau)(2)) = 0.328 +/- 0.012 which implies alpha((nf=5))(s)(M-Z(2)) = 0.1197 +/- 0.0014. We critically revise previous work, and point out the problems flawing some recent analyses which claim slightly smaller values.
ER