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arXiv 1708.07348hep-phhep-exhep-lat
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激发态$Ω_b$重子的衰变宽度

Decay widths of the excited $Ω_b$ baryons

S. S. Agaev, K. Azizi, H. Sundu

摘要:

LHCb合作组最近观测到了五个窄的$Ω_c^{0}$共振,并通过$ Ω_c^{0} \to Ξ_c^{+}K^{-}$衰变测量了它们的质量和宽度。受这一发现的启发,同时也考虑到自旋为1/2的基态底重子$Ω_b^{-}$已经在实验上被发现的事实,我们通过计算它们的第一轨道和径向激发态到$Ξ_b^{0} K^{-}$的衰变宽度,对自旋为1/2和3/2的$Ω_b$重子进行了理论研究.为此,我们在光锥上采用QCD求和规则方法,分析了$K$介子分布振幅直到扭转4。得到的解析表达式被用来提取这些衰变过程的参数,这可能是有用的,为即将进行的实验研究的底部重子。

英文摘要:

The LHCb Collaboration recently observed five narrow $Ω_c^{0}$ resonances, and measured their masses and widths through the decays $ Ω_c^{0} \to Ξ_c^{+}K^{-}$. Motivated by this discovery, and also by the fact that the ground-state bottom baryon $Ω_b^{-}$ with spin-1/2 was already found experimentally, we perform theoretical investigation of the spin-1/2 and spin-3/2, $Ω_b$, baryons by calculating decay width of their first orbitally and radially excited states to $Ξ_b^{0} K^{-}$. For this purpose, we employ QCD sum rule method on the light-cone by including into analysis the $K$ meson distribution amplitudes up to twist-4. Obtained analytical expressions are utilized to extract parameters of these decay processes which may be useful for forthcoming experimental studies of bottom baryons.

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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