Speaker
Dr
Isabella Garzia
(SLAC & INFN (IT))
Description
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.
Authors
(A. Soffer) babar collaboration
(SLAC)
Dr
Isabella Garzia
(SLAC & INFN (IT))
