Measurement of Azimuthal Asymmetries in Inclusive Charged Dipion Production in e^{+}e^{-} Annihilations at sqrt[s]=3.65  GeV.

  title={Measurement of Azimuthal Asymmetries in Inclusive Charged Dipion Production in e^\{+\}e^\{-\} Annihilations at sqrt[s]=3.65  GeV.},
  author={M. Ablikim and M. N. Achasov and X. C. Ai and O. Albayrak and M. Albrecht and D. J. Ambrose and Antonio Amoroso and Zahra Haddadi and Nasser Kalantar-Nayestanaki and Myroslav Kavatsyuk and H. Loehner and J. G. Messchendorp and Marcel Tiemens},
  journal={Physical review letters},
  volume={116 4},
We present a measurement of the azimuthal asymmetries of two charged pions in the inclusive process e^{+}e^{-}→ππX, based on a data set of 62  pb^{-1} at the center-of-mass energy of 3.65 GeV collected with the BESIII detector. These asymmetries can be attributed to the Collins fragmentation function. We observe a nonzero asymmetry, which increases with increasing pion momentum. As our energy scale is close to that of the existing semi-inclusive deep inelastic scattering experimental data, the… CONTINUE READING
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