Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at \sqrt{s} = 10.58 GeV

A. Ogawa; Belle Collaboration: R.Seidl; et al; M. Grosse-Perdekamp

arxiv: 0805.2975 · v1 · submitted 2008-05-19 · ✦ hep-ex

Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at sqrt{s} = 10.58 GeV

Belle Collaboration: R.Seidl , M. Grosse-Perdekamp , A. Ogawa , et al This is my paper

classification ✦ hep-ex

keywords azimuthalannihilationasymmetriesmeasurementpairsquarkspintransverse

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The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods we measure statistically significant azimuthal asymmetries for charged pion pairs in e+e- annihilation at center-of-mass energies of 10.52 GeV and 10.58 GeV, which can be attributed to the fragmentation of primordial quarks with transverse spin components. The measurement was performed using a dataset of 547 fb^{-1} collected by the Belle detector at KEKB improving the statistics of the previously published results by nearly a factor of 20.

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