N. Gabyshev
Novosibirsk State University
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Physical Review Letters | 2011
A. Vossen; R. Seidl; I. Adachi; H. Aihara; T. Aushev; V. Balagura; W. Bartel; M. Bischofberger; A. Bondar; M. Bračko; T. E. Browder; M. C. Chang; A. Chen; P. Chen; B. G. Cheon; K. Cho; Y. Choi; S. Eidelman; M. Feindt; V. Gaur; N. Gabyshev; A. Garmash; B. Golob; M. Grosse Perdekamp; J. Haba; K. Hayasaka; Y. Horii; Y. Hoshi; W.-S. Hou; H. J. Hyun
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.
