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Measurement of azimuthal asymmetries in inclusive production of hadron pairs in e+e- annihilation at s=10.58GeV

  • Seidl, R.
  • Grosse Perdekamp, M.
  • Ogawa, A.
  • Adachi, I.
  • Aihara, H.
  • Bahinipati, S.
  • Bakich, A.M.
  • Bartel, W.
  • Bitenc, U.
  • Bondar, A.
  • Bozek, A.
  • Bračko, M.
  • Brodzicka, J.
  • Browder, T.E.
  • Chao, Y.
  • Chen, A.
  • Cheon, B.G.
  • Chistov, R.
  • Cho, I.-S.
  • Choi, Y.
  • And 97 more
Publication Date
Jan 01, 2008
Infoscience @ EPFL
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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 data set of 547fb-1 collected by the Belle detector at KEKB improving the statistics of the previously published results by nearly a factor of 20. © 2008 The American Physical Society.


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