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arXiv 1408.6802hep-ex
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一种测量$Λ_c$衰变绝对分支分数的方法

A method to measure the absolute branching fractions of $Λ_c$ decays

Andrea Contu, Dorothea Fonnesu, Rudolf Gerhard Christiaan Oldeman, Biagio Saitta, Claudia Vacca

摘要:

本文提出利用强子对撞机上大量产生的介子${B}^+ \rightarrow p π^+ π^+ \barΣ_c^{--}$及其电荷共轭$B^-$的衰变,通过强衰变$Σ_c \rightarrow Λ_c π$获得$Λ_c$重子样品。由此获得的样品不受通常由依赖于特定衰变模式的选择引入的偏差的影响。因此,它允许测量的绝对分支分数的$Λ_c$重子衰变到$ p K π$或其他可观察到的最终状态,以模型独立的方式进行。可以实现与这种方法的准确性进行了讨论,它示出,它将是竞争力或改进电流测量。

英文摘要:

It is proposed to exploit the decay of the meson ${B}^+ \rightarrow p π^+ π^+ \barΣ_c^{--}$ and of its charge conjugate $B^-$ copiously produced at LHC to obtain a sample of $Λ_c$ baryons through the strong decay $Σ_c \rightarrow Λ_c π$. The sample thus obtained is not affected by biases typically introduced by selections that depend on specific decay modes. Therefore it allows a measurement of the absolute branching fraction for the decay of the $Λ_c$ baryon into $ p K π$ or into other observable final states to be performed in a model independent manner. The accuracy that can be achieved with this method is discussed and it is shown that it would be either competitive with or an improvement over current measurements.

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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