Measurement of the Resonant and Non-Resonant Branching Ratios in ${\Xi }_c^0\to {\Xi }^0{K}^{+}{K}^{-}$

Abstract

Using the entire data sample of $980$ $f{b}^{-1}$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, $W$-exchange resonant decay ${\Xi }_c^0\to {\Xi }^0\varphi (\to K^{+}{K}^{-})$ with a polarized $\varphi$ and the non-resonant decay via a direct process ${\Xi }_c^0\to {\Xi }^0{K}^{+}{K}^{-}$. We present these measurements, relative to the normalization mode ${\Xi }^{-}{\pi }^{+}$, and find branching ratios $\frac{\mathcal{B}({\Xi }_c^0\to {\Xi }^0\varphi (\to K^{+}{K}^{-}))}{\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})}=0.036\pm 0.004(stat.)\pm 0.002(syst.)$ and $\frac{\mathcal{B}({\Xi }_c^0\to {\Xi }^0{K}^{+}{K}^{-})}{\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})}=0.039\pm 0.004(stat.)\pm 0.002(syst.)$ which suggest that only minor cusping peaks occur in the combinatorial background of ${\Omega }^{\ast -}\to {\Xi }^0{K}^{-}$ due to these ${\Xi }_c^0$ decays.

arXiv comment10 pages, 7 figures, 1 table, On behalf of the Belle Collaboration, Accepted by Phys. Rev. D (05/10/21) DZ12501

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Cited by in corpus (2)

• Nonleptonic three-body charmed baryon weak decays with H(15)
• Search for the semileptonic decays ${\Xi }_c^0\to {\Xi }^0{\ell }^{+}{\ell }^{-}$ at Belle