25–29 Sept 2017
Salamanca, Spain
Europe/Zurich timezone

Hadronic transitions in bottomonium at Belle

27 Sept 2017, 12:15
20m
Sala Menor

Sala Menor

Talk Spectroscopy of mesons Spectroscopy of mesons

Speaker

Elisa Guido (INFN Torino)

Description

The study of hadronic transitions among bottomonium states, and their
relative magnitude, can be used as a bench test for non-perturbative
approaches to QCD. In particular, transitions through an eta meson,
despite involving a heavy quark spin symmetry violation, have been
measured to have an unexpectedly enhanced branching fraction with respect
to those through a dipion system. A set of recent results obtained using
the data collected by the Belle experiment at the energy of the
Upsilon(4S) and Upsilon(5S) resonances will be presented.
They include the observation of the transition Upsilon(5S)->etaUpsilon(1D),
an updated measurement of the branching fractions of
Upsilon(4S)->eta Upsilon(1S) and Upsilon(4S)->pi+pi-Upsilon(1S,2S) decays,
and searches for other possible transitions involving an eta meson.

Primary author

Elisa Guido (INFN Torino)

Presentation materials