Observation of transverse polarization asymmetries of charged pion pairs in $e^+e^-$ annihilation near $\\sqrt{s}=10.58$ GeV
Journal
Physical Review Letters
Journal Volume
107
Pages
072004
Date Issued
2011-04
Author(s)
Abstract
The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e(+)e(-) annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered π(+)π(-) pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672 fb(-1) data sample that contains 711 × 10(6) π(+)π(-) pairs and was collected at and near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
Type
journal article