Azimuthal asymmetries of back-to-back $\pi^\pm-(\pi^0,\eta,\pi^\pm)$ pairs in $e^+e^-$ annihilation
Creators: name: Li, H.
name: Vossen, A.
name: Aihara, H.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Babu, V.
name: Badhrees, I.
name: Bakich, A. M.
name: Bennett, J.
name: Bhardwaj, V.
name: Bilka, T.
name: Biswal, J.
name: Bobrov, A.
name: Bračko, M.
name: Campajola, M.
name: Cao, L.
name: Červenkov, D.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Cho, H. E.
name: Cho, K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Cunliffe, S.
name: Di Capua, F.
name: Di Carlo, S.
name: Dong, T. V.
name: Eidelman, S.
name: Ferber, T.
name: Fulsom, B. G.
name: Gaur, V.
name: Garmash, A.
name: Giri, A.
name: Goldenzweig, P.
name: Hartbrich, O.
name: Hayasaka, K.
name: Hayashii, H.
name: Huang, K.
name: Inami, K.
name: Ishikawa, A.
name: Itoh, R.
name: Jacobs, W. W.
name: Jang, E.-J.
name: Jia, S.
name: Jin, Y.
name: Kang, K. H.
name: Karyan, G.
name: Kim, D. Y.
name: Kim, S. H.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kwon, Y.-J.
name: Lee, S. C.
name: Li, Y. B.
name: Li Gioi, L.
name: Libby, J.
name: Lieret, K.
name: Liventsev, D.
name: Luo, T.
name: MacQueen, C.
name: Masuda, M.
name: Matsuda, T.
name: Merola, M.
name: Miyata, H.
name: Mizuk, R.
name: Mussa, R.
name: Nakano, T.
name: Nakao, M.
name: Nath, K. J.
name: Natkaniec, Z.
name: Nishida, S.
name: Ono, H.
name: Ostrowicz, W.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pal, B.
name: Pardi, S.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Popov, V.
name: Prencipe, E.
name: Prim, M. T.
name: Russo, G.
name: Sahoo, D.
name: Santelj, L.
name: Sanuki, T.
name: Savinov, V.
name: Schneider, O.
name: Schnell, G.
name: Schueler, J.
name: Schwanda, C.
name: Seidl, R.
name: Seino, Y.
name: Senyo, K.
name: Shiu, J.-G.
name: Simon, F.
name: Solovieva, E.
name: Starič, M.
name: Stottler, Z. S.
name: Takizawa, M.
name: Tanida, K.
name: Tenchini, F.
name: Uchida, M.
name: Uno, S.
name: Van Tonder, R.
name: Varner, G.
name: Wang, B.
name: Wang, C. H.
name: Wang, M.-Z.
name: Wang, P.
name: Watanabe, M.
name: Won, E.
name: Yang, S. B.
name: Ye, Hua
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019
Subjects: angular distribution: asymmetry
fragmentation function
annihilation
Collins
thrust
BELLE
transverse momentum dependence
transverse momentum
structure
hadron
flavor
meson

description: 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 $\pi^0$ and $\eta$ mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The $\pi^0$ and $\eta$ 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 $H_1^{\perp}$ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the $\eta$ final states will provide additional information on the flavor structure of $H_1^{\perp}$. 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.