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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

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., Dalseno J., Dash M., Drutskoy A., Eidelman S., Gabyshev N., Golob B., Ha H., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Ishikawa A., Iwasaki Y., Kah D. H., Kaji H., Kawai H., Kawasaki T., Kim H. J., Kim H. O., Kim Y. I., Kim Y. J., Križan P., Kumar R., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lee M. J., Lesiak T., Li J., Limosani A., Liu C., Liventsev D., Mandl F., McOnie S., Medvedeva T., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakano E., Nakazawa H., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Pakhlov P., Pakhlova G., Palka H., Park C. W., Park H., Park H. K., Peak L. S., Piilonen L. E., Sahoo H., Sakai Y., Schneider O., Sekiya A., Senyo K., Sevior M. E., Shapkin M., Shen C. P., Shiu J. G., Singh J. B., Stanič S., Starič M., Sumiyoshi T., Tanaka M.

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.