Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
The theoretical description of the photon spectrum in radiative Upsilon 1S decays has been a challenge since the early days of QCD. I will show that by taking into account a number of results that have recently appeared in the literature an excellent description of data is achieved. This allows for an accurate extraction of the strong coupling constant. I will also discuss how the spectra of higher bottomonium excitations, which have recently been mesured by CLEO, provide important information on their nature.