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Two-pion low-energy contribution to the muon with improved precision from analyticity and unitarity
B. Ananthanarayan, Irinel Caprini, Diganta Das +1
The two-pion contribution from low energies to the muon magnetic moment anomaly, although small, has a large relative uncertainty since in this region the experimental data on the…
decay in models
A Jinaru, C Alexa, I Caprini +1
Based on extended gauge groups, models predict the existence of an additional heavy gauge boson and of a heavy charged H…
Expansions of hadronic spectral function moments in a nonpower QCD perturbation theory with tamed large order behavior
Gauhar Abbas, B. Ananthanarayan, Irinel Caprini +1
The moments of the hadronic spectral functions are of interest for the extraction of the strong coupling and other QCD parameters from the hadronic decays of the lepton.…
Determination of the strong coupling from hadronic tau decays using renormalization group summed perturbation theory
Gauhar Abbas, B. Ananthanarayan, I. Caprini
We determine the strong coupling constant α_s from the τhadroni width using a renormalization group summed (RGS) expansion of the QCD Adler function. The main theoretical uncertain…
Strong coupling from the tau hadronic width by non-power QCD perturbation theory
I. Caprini
Starting from the divergent character of the perturbative expansions in QCD and using the technique of series acceleration by the conformal mappings of the Borel plane, I define a…
Parametrization-free determination of the shape parameters for the pion electromagnetic form factor
B. Ananthanarayan, I. Caprini, Diganta Das +1
Recent data from high statistics experiments that have measured the modulus of the pion electromagnetic form factor from threshold to relatively high energies are used as input in…