On the ηb → J/ψ J/ψ decay
نویسنده
چکیده
It has been argued long ago that ηb could be observed through the ηb → J/ψ(→ μ+μ−)J/ψ(→ μ+μ−) decay chain. Recent calculations indicate that the width of ηb into two J/ψ is almost three order of magnitude smaller than the one into the DD. We study the effects of final state interactions due to the DD intermediate state on the J/ψ J/ψ final state. We find that the inclusion of this contribution may enhance the short distance branching ratio of about two orders of magnitude.
منابع مشابه
34 th International Conference on High Energy Physics, Philadelphia, 2008 Final state interaction effects on the ηb → J/ψJ/ψ decay ∗
Large efforts have been invested during the past thirty years to look for ηb but the evidence of its existence emerged very recently thanks to the Babar collaboration [1]. In [1] is reported the first unambiguous evidence of ηb, with a 10 σ significance, through the hindered magnetic dipole transition process Υ(3S) → ηbγ. The mass of ηb is also measured to be mηb = 9388.9 +3.1 −2.3(stat) ± 2.7(...
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