Further study on excited $Ξ_{QQ^{\prime}}$ via photoproduction at CEPC and FCC-ee
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2025
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| _version_ | 1866909466787577856 |
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| author | Ma, Hong-Hao Niu, Juan-Juan Guo, Lei |
| author_facet | Ma, Hong-Hao Niu, Juan-Juan Guo, Lei |
| contents | Within the framework of NRQCD, the photoproduction of doubly heavy baryons $Ξ_{cc}$, $Ξ_{bc}$, $Ξ_{bb}$ and their $P$-wave excited states has been systematically investigated. The production mechanism is that a color anti-triplet or sextuplet diquark $\langle QQ^{\prime} \rangle$ is first produced, and then evolved into a corresponding doubly heavy baryon $Ξ_{QQ^{\prime}}$ via the subprocess $γ+γ\rightarrow \langle QQ^{\prime} \rangle[n] +\bar{Q^{\prime}}+\bar{Q} \rightarrow Ξ_{QQ^{\prime}} +\bar{Q^{\prime}}+\bar{Q}$. Here, $Q^{(\prime)}$ denotes the heavy quark $b$ or $c$, [$n$] is the color and spin quantum number of intermediate diquark, which can be $[^3S_1]_{\bar{\textbf{3}}/\textbf{6}}$ and $[^1S_0]_{\bar{\textbf{3}}/\textbf{6}}$ for $S$-wave states, or $[^1P_1]_{\bar{\textbf{3}}/\textbf{6}}$ and $[^3P_J]_{\bar{\textbf{3}}/\textbf{6}}$ with $J=0,~1,~2$ for $P$-wave states. Predictions for the cross sections, differential distributions, and theoretical uncertainty have been analyzed. The results indicate that, at $\sqrt{s}=91$ GeV, the contribution of photoproduction for $P$-wave $Ξ_{cc}$, $Ξ_{bc}$, and $Ξ_{bb}$ is approximately $2.19\%$, $4.23\%$, $1.26\%$ of the contribution for $S$-wave, respectively. As the collision energy increases, the contribution of $P$-wave also increases. Assuming that the highly excited state can decay into ground state with $100\%$ efficiency, the total produced events at CEPC and FCC-ee can be as high as $\mathcal{O}(10^8)$, $\mathcal{O}(10^7),$ and $\mathcal{O}(10^5)$ corresponding to $Ξ_{cc}$, $Ξ_{bc}$, and $Ξ_{bb}$, respectively, which is very promising to be detected in future experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16031 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Further study on excited $Ξ_{QQ^{\prime}}$ via photoproduction at CEPC and FCC-ee Ma, Hong-Hao Niu, Juan-Juan Guo, Lei High Energy Physics - Phenomenology Within the framework of NRQCD, the photoproduction of doubly heavy baryons $Ξ_{cc}$, $Ξ_{bc}$, $Ξ_{bb}$ and their $P$-wave excited states has been systematically investigated. The production mechanism is that a color anti-triplet or sextuplet diquark $\langle QQ^{\prime} \rangle$ is first produced, and then evolved into a corresponding doubly heavy baryon $Ξ_{QQ^{\prime}}$ via the subprocess $γ+γ\rightarrow \langle QQ^{\prime} \rangle[n] +\bar{Q^{\prime}}+\bar{Q} \rightarrow Ξ_{QQ^{\prime}} +\bar{Q^{\prime}}+\bar{Q}$. Here, $Q^{(\prime)}$ denotes the heavy quark $b$ or $c$, [$n$] is the color and spin quantum number of intermediate diquark, which can be $[^3S_1]_{\bar{\textbf{3}}/\textbf{6}}$ and $[^1S_0]_{\bar{\textbf{3}}/\textbf{6}}$ for $S$-wave states, or $[^1P_1]_{\bar{\textbf{3}}/\textbf{6}}$ and $[^3P_J]_{\bar{\textbf{3}}/\textbf{6}}$ with $J=0,~1,~2$ for $P$-wave states. Predictions for the cross sections, differential distributions, and theoretical uncertainty have been analyzed. The results indicate that, at $\sqrt{s}=91$ GeV, the contribution of photoproduction for $P$-wave $Ξ_{cc}$, $Ξ_{bc}$, and $Ξ_{bb}$ is approximately $2.19\%$, $4.23\%$, $1.26\%$ of the contribution for $S$-wave, respectively. As the collision energy increases, the contribution of $P$-wave also increases. Assuming that the highly excited state can decay into ground state with $100\%$ efficiency, the total produced events at CEPC and FCC-ee can be as high as $\mathcal{O}(10^8)$, $\mathcal{O}(10^7),$ and $\mathcal{O}(10^5)$ corresponding to $Ξ_{cc}$, $Ξ_{bc}$, and $Ξ_{bb}$, respectively, which is very promising to be detected in future experiments. |
| title | Further study on excited $Ξ_{QQ^{\prime}}$ via photoproduction at CEPC and FCC-ee |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.16031 |