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arXiv 1209.3716hep-phhep-ex
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π介子从χ_{ cJ }到η_c的跃迁

Pion transitions from χ_{cJ} to η_c

M. B. Voloshin

摘要:

考虑了粲偶素从$χ_{cJ}$态到$η_c$态的跃迁,并发射一个或两个π介子。结果表明,在QCD多极展开中,在首序中出现的这类过程只有衰变$χ_{c1} \to η_c π^+ π^-$和$χ_{c0} \to η_c π^0$ .后者衰变的绝对速率,尽管被同位素抑制,是由约一个数量级大于前者,使两个过程的分支分数是近似相等的,并预计将显着低于最近的上限由BESIII报告。这两个衰变的速率也与另一个类似的跃迁$h_c \to J/ψπ^0$有关。

英文摘要:

The charmonium transitions from the $χ_{cJ}$ states to $η_c$ with emission of one or two pions are considered. It is shown that the only processes of such type arising in the leading order in the QCD multipole expansion are the decays $χ_{c1} \to η_c π^+ π^-$ and $χ_{c0} \to η_c π^0$. The absolute rate of the latter decay, in spite of being isotopically suppressed, is by about an order of magnitude larger than that of the former, so that the branching fractions for the two processes are approximately equal, and are expected to be significantly below the recent upper bound reported by BESIII. The rates of both decays are also related to that of another similar transition $h_c \to J/ψπ^0$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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