Speaker
Isabella Garzia
(INFN)
Description
Inclusive hadron production cross section and angular distributions in $e^+e^-$ collisions shed light on fundamental questions of hadronization and fragmentation processes.
We present measurements of the so called Collins azimuthal asymmetries in
inclusive production of hadron pairs in $e^+e^- \rightarrow h_1h_2X$ annihilation process, where the
two hadrons are produced in opposite hemispheres.
In particular, we show BaBar preliminary results for $KK$, and $K\pi$ hadron pair combinations,
as well as the Collins asymmetries for pion pairs.
We also report the preliminary results from the BESIII experiment,
which studies pion pairs azimuthal asymmetries using a data set
collected at the center-of-mass energy $\sqrt{s}=3.65$ GeV.
The comparison between asymmetries measured at B factories ($\sqrt{s}~10.6$ GeV) and those measured at
BESIII can be used as a tool to understand the evolution of the Collins fragmentation function.
| Session | 5: TMD fragmentation functions in e+e- and SIDIS processes |
|---|
Author
Isabella Garzia
(INFN)
Co-author
Fabio Anulli
(Universita e INFN, Roma I (IT))
