2–4 Sept 2015
Trieste
Europe/Rome timezone
Conference web-site <a href="http://ecsac.ictp.it/ecsac15" target="A path towards TMD extraction - ECSAC Conference Trieste, Italy">TMDe2015</a>

Collins asymmetries in e+e- annihilation

3 Sept 2015, 16:30
15m
Giambiagi Lecture Hall (Trieste)

Giambiagi Lecture Hall

Trieste

Adriatico guesthouse, lower level 1 ICTP - Strada Costiera, 11 I - 34151 Trieste Italy

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

Primary author

Isabella Garzia (INFN)

Co-author

Fabio Anulli (Universita e INFN, Roma I (IT))

Presentation materials