Further study on excited Ξ QQ ′ $$ {\Xi}_{QQ^{\prime }} $$ via photoproduction at CEPC and FCC-ee
Abstract 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 ⟨QQ ′⟩ is first produced, and then evolved into a co...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP05(2025)197 |
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| Summary: | Abstract 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 ⟨QQ ′⟩ is first produced, and then evolved into a corresponding doubly heavy baryon Ξ QQ ′ $$ {\Xi}_{QQ^{\prime }} $$ via the subprocess γ + γ → ⟨QQ ′⟩[n] + Q ¯ ′ $$ {\overline{Q}}^{\prime } $$ + Q ¯ $$ \overline{Q} $$ → Ξ QQ ′ $$ {\Xi}_{QQ^{\prime }} $$ + Q ¯ ′ $$ {\overline{Q}}^{\prime } $$ + Q ¯ $$ \overline{Q} $$ . Here, Q (′) denotes the heavy quark b or c, [n] is the color and spin quantum number of intermediate diquark, which can be S 1 3 3 ¯ / 6 $$ {\left[^3{S}_1\right]}_{\overline{\textbf{3}}/\textbf{6}} $$ and S 0 1 3 ¯ / 6 $$ {\left[^1{S}_0\right]}_{\overline{\textbf{3}}/\textbf{6}} $$ for S-wave states, or P 1 1 3 ¯ / 6 $$ {\left[^1{P}_1\right]}_{\overline{\textbf{3}}/\textbf{6}} $$ and P J 3 3 ¯ / 6 $$ {\left[^3{P}_J\right]}_{\overline{\textbf{3}}/\textbf{6}} $$ 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 s $$ \sqrt{s} $$ = 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 O 10 8 $$ \mathcal{O}\left({10}^8\right) $$ , O 10 7 $$ \mathcal{O}\left({10}^7\right) $$ , and O 10 5 $$ \mathcal{O}\left({10}^5\right) $$ corresponding to Ξ cc , Ξ bc , and Ξ bb , respectively, which is very promising to be detected in future experiments. |
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| ISSN: | 1029-8479 |