Fragmentation-fraction ratio $$f_{\Xi _b}/f_{\Lambda _b}$$ f Ξ b / f Λ b in b- and c-baryon decays

We study the ratio of fragmentation fractions, $$f_{\Xi _b}/f_{\Lambda _b}$$ , from the measurement of $$\Xi _b^0\rightarrow \Xi _c^+\pi ^-$$ and $$\Lambda _b^0\rightarrow \Lambda _c^+\pi ^-$$ with $$\Xi _{c}^{+}/\Lambda _{c}^{+}\rightarrow p K^-\pi ^+$$ . With the branching fraction $$\mathcal {B}(\Xi _c^+\rightarrow pK^-\pi ^+)=(2.2\pm 0.8)\%$$ obtained under the U-spin symmetry, the fragmentation ratio is determined as $$f_{\Xi _b}/f_{\Lambda _b}$$ $$\,\, =0.054\pm 0.020$$ . To reduce the above uncertainties, we suggest to measure the branching fractions of $$\Xi _c^+\rightarrow p \overline{K}^{*0}$$ and $$\Lambda _c^+\rightarrow \Sigma ^+ K^{*0}$$ at BESIII, Belle II and LHCb.

Hali tarjima qilinmagan