Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Measurement of Collins asymmetries in inclusive production of pion pairs in e+e- collisions at BABAR

Jul 7, 2012, 4:45 PM
Room 217 (Melbourne Convention and Exhibition Centre)

Room 217

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 6. QCD, Jets, Parton Distributions Room 217 - Education & Outreach - QCD, Jet, Parton Distributions - TR15&6


Dr Isabella Garzia (SLAC & INFN (IT))


The transversity distribution function, which describes the quark transverse polarization inside a transversely polarized nucleon, is the least known leading-twist component of the QCD description of the partonic structure of the nucleon. Transversity can be extracted from semi-inclusive deep-inelastic-scattering data where, however, it couples to a new fragmentation function, called the Collins function. We present a measurement of the azimuthal asymmetries in the process e+e- --> q qbar --> pi pi X, where the two pions are produced in opposite hemispheres, based on data collected by the BABAR experiment at a center-of-mass energy of about 10 GeV. The Collins function is extracted from the measured asymmetries.

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