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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 107, p. -

Observation of transverse polarization asymmetries of charged pion pairs in e +e - annihilation near √s=10.58GeV

Vossen A., Seidl R., Adachi I., Aihara H., Aushev T., Balagura V., Bartel W., Bischofberger M., Bondar A., Bračko M., Browder T. E., Chang M. C., Chen A., Chen P., Cheon B. G., Cho K., Choi Y., Eidelman S., Feindt M., Gaur V., Gabyshev N., Garmash A., Golob B., Grosse Perdekamp M., Haba J., Hayasaka K., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Ishikawa A., Iwabuchi M., Iwasaki Y., Iwashita T., Joshi N. J., Kichimi H., Kim H. O., Kim M. J., Ko B. R., Kumita T., Lange J. S., Lee M. J., Lee S. H., Leitgab M., Li Y., Liu C., Liventsev D., Louvot R., McOnie S., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Nakano E., Nishida S., Nitoh O., Ogawa A., Ohshima T., Okuno S., Pakhlova G., Park H., Park H. K., Petrič M., Piilonen L. E., Ryu S., Sahoo H., Sakai Y., Schneider O., Schwanda C., Seon O., Shapkin M., Shebalin V., Shibata T. A., Shiu J. G., Smerkol P., Sohn Y. S., Solovieva E., Stanič S., Starič M., Sumihama M., Sumiyoshi T., Teramoto Y., Uchida M., Uehara S., Uglov T.

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 672fb -1 data sample that contains 711×106 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. © 2011 American Physical Society.