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Li, H.; Aulchenko, V.; Aushev, T.; Babu, V.; Badhrees, I.; Bakich, A. M.; Bennett, J.; Bhardwaj, V.; Bilka, T.; Biswal, J.; Bobrov, A.; Campajola, M.; Cao, L.; Červenkov, D.; Chekelian, V.; Chen, A.; Cho, H. E.; Cho, K.; Choudhury, S.; Cunliffe, S.; Di Capua, F.; Dong, T. V.; Eidelman, S.; Ferber, T.; Gaur, V.; Garmash, A.; Hartbrich, O.; Huang, K.; Inami, K.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jang, E.-J.; Jia, S.; Jin, Y.; Kang, K. H.; Karyan, G.; Kim, S. H.; Kodyš, P.; Korpar, S.; Križan, P.; Kroeger, R.; Krokovny, P.; Kwon, Y.-J.; Lee, S. C.; Li, Y. B.; Li Gioi, L.; Libby, J.; Lieret, K.; MacQueen, C.; Masuda, M.; Matsuda, T.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mussa, R.; Nakano, T.; Nath, K. J.; Natkaniec, Z.; Nishida, S.; Ono, H.; Ostrowicz, W.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Patra, S.; Paul, S.; Pedlar, T. K.; Piilonen, L. E.; Popov, V.; Russo, G.; Sahoo, D.; Sanuki, T.; Savinov, V.; Schneider, O.; Schueler, J.; Schwanda, C.; Senyo, K.; Shiu, J.-G.; Simon, F.; Starič, M.; Stottler, Z. S.; Takizawa, M.; Tanida, K.; Tenchini, F.; Uglov, T.; Uno, S.; Van Tonder, R.; Varner, G.; Wang, B.; Wang, C. H.; Wang, P.; Watanabe, M.; Won, E.; Yang, S. B.; Ye, H.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.
Physical review. D, 11/2019, Volume: 100, Issue: 9Journal Article
This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e− annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1⊥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1⊥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb−1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.
