Measurement of Collins asymmetry in inclusive production of pion pairs at BaBar
1 INFN-Sezione di Ferrara
2 INFN-Sezione di Roma
Published online: 23 January 2015
We present a measurement of the azimuthal asymmetries induced by the Collins effect in inclusive production of pion pairs in the e+e− → ππX annihilation process, where two charged pion pairs are produced in opposite hemispheres. The data collected by the BABAR detector at the SLAC Linear Accelerator Laboratory allows the determination of the Collins fragmentation function as a function of the pion fractional energies and transverse momenta, as well as the determination of its behavior in a 4-dimensional space. These results can be combined with semi-inclusive deep inelastic scattering data to extract the transversity parton distribution function, which is the least known leading-twist component of the QCD description of the nucleon.
© Owned by the authors, published by EDP Sciences, 2015
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