Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-04
Nucl.Phys.B768:85-115,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 12 figures
Scientific paper
10.1016/j.nuclphysb.2007.01.014
We compare experimental spectra of radiative and semileptonic B decays with the predictions of a model based on soft-gluon resummation to next-to-next-to leading order and on a ghost-less time-like coupling. We find a good agreement with photon spectra in the radiative decay and with hadron mass distributions in the semileptonic one: the extracted values for alpha_S(m_Z) are in agreement with the current PDG average within at most two standard deviations. The agreement is instead less good for the electron spectra measured by BaBar and Belle in semileptonic decays for small electron energies (< 2.2 GeV): our spectrum is harder. We also show that, in general, the inclusion of next-to-next-to-leading order effects is crucial for bringing the model closer to the data and that the non-power expansion introduced in the framework of analytic coupling studies does not accurately describe soft-gluon effects.
Aglietti Ugo
Ferrera Giancarlo
Ricciardi Giulia
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