s produced in the $e^+e^-$ annihilation\nat CLEO energy ($\\sqrt{s} = 10.58$ GeV) are considered in the framework of\nNRQCD factorization formalism. We find that the $J\u002F\\psi$ polarization has\nstrong dependence on the production mechanism. At CLEO energy, the most\ndominant $J\u002F\\psi$ production mechanism in the most phase space is the\ncolor-singlet mechanism, $e^+e^- \\to J\u002F\\psi+gg$, for which $J\u002F\\psi s are\nhighly longitudinally polarized. On the other hand, the dominant $J\u002F\\psi$\nproduction mechanism at the upper end point of $J\u002F\\psi$ energy distribution is\nthe color-octet process, $e^+e^- \\to (c\\bar{c})^{(8)} +g$, for which $J\u002F\\psi s\nare almost unpolarized. Thus, the measurement of the polarization of the end\npoint $J\u002F\\psi s can give another test of color-octet mechanism, and constraint\non the NRQCD matrix elements.","abstract_zh":"","authors":[{"id":"53f7f814dabfae7f97a380b6","name":"Seungwon Baek"},{"name":"P. Ko"},{"id":"5447eb2bdabfae87b7dade4d","name":"Jungil Lee"},{"name":"H. S. Song"}],"doi":"","id":"53e9a2a4b7602d9702baa198","is_downvoted":false,"is_starring":false,"is_upvoted":false,"issn":"J.KoreanPhys.Soc.33:97-101,1998","keywords":["phase space"],"labels":["en_journal"],"lang":"en","num_citation":99,"num_starred":0,"num_upvoted":0,"num_viewed":39,"pages":{"end":"","start":""},"pdf":"https:\u002F\u002Fstatic.aminer.cn\u002Fstorage\u002Fpdf\u002Farxiv\u002F98\u002F9804\u002Fhep-ph9804455.pdf","title":"Polarized J\u002Fpsi production at CLEO","urls":["https:\u002F\u002Farxiv.org\u002Fabs\u002Fhep-ph\u002F9804455"],"venue":{"issue":"","volume":""},"versions":[{"id":"53e2803e20f7fff67832056f","sid":"27742214","src":"msra","year":1998},{"id":"56d8b10edabfae2eeee176cc","sid":"1544575320","src":"mag","year":1998},{"id":"5c610636da56297340aac7a4","sid":"hep-ph\u002F9804455","src":"arxiv","year":1998}],"year":1998}}};